# OpcData Members > Reference: Defines an abstract base class of data objects used and provided in the ecosystem of a specific OPC UA Server.
Type
OpcData
Namespace
Opc.UaFx
Assembly
Opc.UaFx.Advanced.dll
Package
Opc.UaFx.Advanced v2.59.0
Also in
Opc.UaFx.Client
## Constructors ### OpcData protected · 2 overloads | Overload | Description | |---|---| | [OpcData()](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#opcdata-noparams)protected · since v2.32 | Initializes a new instance of the [OpcData](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/) class. | | [OpcData(IOpcDataStore)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#opcdata-opc-uafx-iopcdatastore)protected | Initializes a new instance of the [OpcData](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/) class using the `dataStore` specified. | #### OpcData() protected · since v2.32 Initializes a new instance of the [OpcData](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/) class.
```csharp protected OpcData() ```
```vbnet Protected Sub New() ```
#### OpcData(IOpcDataStore) protected Initializes a new instance of the [OpcData](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/) class using the `dataStore` specified.
```csharp protected OpcData(IOpcDataStore dataStore) ```
```vbnet Protected Sub New(dataStore As IOpcDataStore) ```
**Parameters** | Name | Type | Description | |---|---|---| | `dataStore` | [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) | The [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) of the object data to represent. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `dataStore` is a null reference (Nothing in Visual Basic). | ## Properties ### DataStore protected Gets the [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) which contains the data of this [OpcData](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/) instance.
```csharp protected IOpcDataStore DataStore { get; } ```
```vbnet Protected ReadOnly Property DataStore As IOpcDataStore ```
**Property value** [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) An instance implementing the [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) interface containing the object data represented by this [OpcData](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/) instance. ## Methods ### Decode static · 3 overloads | Overload | Description | |---|---| | [Decode<T>(OpcContext, byte\[\])](#decode-t1-opc-uafx-opccontext-system-byte-array)static · since v2.40 | Converts the `buffer` specified to the `T` defined. | | [Decode<T>(OpcContext, Stream)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#decode-t1-opc-uafx-opccontext-system-io-stream)static · since v2.40 | Converts the data in the `stream` specified to the `T` defined. | | [Decode<T>(OpcContext, OpcRawObject)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#decode-t1-opc-uafx-opccontext-opc-uafx-opcrawobject)static · since v2.58 | Converts the `value` specified to the `T` defined. | **Exceptions (all overloads)** | Exception | Condition | |---|---| | [OpcException](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcexception/) | The decoding has failed. For more details exception data. | #### Decode<T>(OpcContext, byte\[\]) static · since v2.40 Converts the `buffer` specified to the `T` defined.
```csharp public static T Decode(OpcContext context, byte[] buffer) where T : new() ```
```vbnet Public Shared Function Decode(Of T As New)( context As OpcContext, buffer As Byte()) As T ```
**Type parameters** | Name | Description | |---|---| | `T` | The type to decode with a default constructor. | **Parameters** | Name | Type | Description | |---|---|---| | `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) to use to decode the `buffer`. | | `buffer` | [Byte](https://learn.microsoft.com/dotnet/api/system.byte)[] | An array of [byte](https://learn.microsoft.com/dotnet/api/system.byte) values to decode. | **Returns** T A new instance of the type defined by `T` and decoded with the information in the `buffer`. **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `context` or `buffer` is a null reference (Nothing in Visual Basic). | #### Decode<T>(OpcContext, Stream) static · since v2.40 Converts the data in the `stream` specified to the `T` defined.
```csharp public static T Decode(OpcContext context, Stream stream) where T : new() ```
```vbnet Public Shared Function Decode(Of T As New)( context As OpcContext, stream As Stream) As T ```
**Type parameters** | Name | Description | |---|---| | `T` | The type to decode with a default constructor. | **Parameters** | Name | Type | Description | |---|---|---| | `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) to use to decode the `stream` data. | | `stream` | [Stream](https://learn.microsoft.com/dotnet/api/system.io.stream) | A [Stream](https://learn.microsoft.com/dotnet/api/system.io.stream) its data is to be decoded. | **Returns** T A new instance of the type defined by `T` and decoded with the information in the `stream`. **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `context` or `stream` is a null reference (Nothing in Visual Basic). | #### Decode<T>(OpcContext, OpcRawObject) static · since v2.58 Converts the `value` specified to the `T` defined.
```csharp public static T Decode( OpcContext context, OpcRawObject value) where T : new() ```
```vbnet Public Shared Function Decode(Of T As New)( context As OpcContext, value As OpcRawObject) As T ```
**Type parameters** | Name | Description | |---|---| | `T` | The type to decode with a default constructor. | **Parameters** | Name | Type | Description | |---|---|---| | `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) to use to decode the `value`. | | `value` | [OpcRawObject](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrawobject/) | The [OpcRawObject](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrawobject/) to decode, either binary or XML encoded. | **Returns** T A new instance of the type defined by `T` and decoded with the information in the [RawData](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrawobject/members#rawdata) of the `value`. **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `context` or `value` is a null reference (Nothing in Visual Basic). | ### DeepCopy protected · virtual Creates a copy of the current [OpcData](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/), which the SDK uses whenever it copies an encodable value of it.
```csharp protected virtual object DeepCopy() ```
```vbnet Protected Overridable Function DeepCopy() As Object ```
**Returns** [Object](https://learn.microsoft.com/dotnet/api/system.object) A new object which is a copy of the current [OpcData](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/). **Remarks** The default implementation creates a shallow copy (see [MemberwiseClone()](https://learn.microsoft.com/dotnet/api/system.object.memberwiseclone)). Override it to copy referenced objects too. ### Encode static · 2 overloads · since v2.58 | Overload | Description | |---|---| | [Encode(OpcContext, object)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#encode-opc-uafx-opccontext-system-object)static · since v2.58 | Encodes the `value` specified using its [Binary](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcencodingtype/#binary) encoding. | | [Encode(OpcContext, object, OpcEncodingType)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#encode-opc-uafx-opccontext-system-object-opc-uafx-opcencodingtype)static · since v2.58 | Encodes the `value` specified using its encoding of the `encodingType` specified. | **Exceptions (all overloads)** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `context` or `value` is a null reference (Nothing in Visual Basic). | | [OpcException](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcexception/) | The encoding has failed. | #### Encode(OpcContext, object) static · since v2.58 Encodes the `value` specified using its [Binary](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcencodingtype/#binary) encoding.
```csharp public static OpcRawObject Encode(OpcContext context, object value) ```
```vbnet Public Shared Function Encode( context As OpcContext, value As Object) As OpcRawObject ```
**Parameters** | Name | Type | Description | |---|---|---| | `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) to use to encode the `value`. | | `value` | [Object](https://learn.microsoft.com/dotnet/api/system.object) | The value of a structured data type to encode. | **Returns** [OpcRawObject](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrawobject/) A new instance of the [OpcRawObject](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrawobject/) class with the encoded `value`. **Exceptions** | Exception | Condition | |---|---| | [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `value` is not the value of a structured data type or its data type does not state a binary encoding. | #### Encode(OpcContext, object, OpcEncodingType) static · since v2.58 Encodes the `value` specified using its encoding of the `encodingType` specified.
```csharp public static OpcRawObject Encode( OpcContext context, object value, OpcEncodingType encodingType) ```
```vbnet Public Shared Function Encode( context As OpcContext, value As Object, encodingType As OpcEncodingType) As OpcRawObject ```
**Parameters** | Name | Type | Description | |---|---|---| | `context` | [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) | The [OpcContext](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opccontext/) to use to encode the `value`. | | `value` | [Object](https://learn.microsoft.com/dotnet/api/system.object) | The value of a structured data type to encode. | | `encodingType` | [OpcEncodingType](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcencodingtype/) | One of the members defined by the [OpcEncodingType](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcencodingtype/) enumeration which states the encoding to use. | **Returns** [OpcRawObject](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrawobject/) A new instance of the [OpcRawObject](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcrawobject/) class with the encoded `value`. **Exceptions** | Exception | Condition | |---|---| | [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `value` is not the value of a structured data type or its data type does not state an encoding of the `encodingType`. | ### GetDataStore protected · virtual · since v2.32 Retrieves the [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) which contains the data of this [OpcData](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/) instance.
```csharp protected virtual IOpcDataStore GetDataStore() ```
```vbnet Protected Overridable Function GetDataStore() As IOpcDataStore ```
**Returns** [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) The [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) which contains the data of this [OpcData](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/) instance. The default implementation returns the data store passed to the constructor. **Remarks** The [DataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#datastore) property calls this method once, on its first access, if no data store was passed to the constructor. Override it to provide the data store on demand. ### GetType static Retrieves the [Type](https://learn.microsoft.com/dotnet/api/system.type) which implementes the data type which is identified by the `typeId` specified.
```csharp public static Type GetType(OpcNodeId typeId) ```
```vbnet Public Shared Function [GetType](typeId As OpcNodeId) As Type ```
**Parameters** | Name | Type | Description | |---|---|---| | `typeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) which identifies the [Type](https://learn.microsoft.com/dotnet/api/system.type) to retrieve. | **Returns** [Type](https://learn.microsoft.com/dotnet/api/system.type) The [Type](https://learn.microsoft.com/dotnet/api/system.type) which is known under the `typeId` specified or a null reference (Nothing in Visual Basic) if there doesn't exist a known [Type](https://learn.microsoft.com/dotnet/api/system.type) which is associated with the `typeId` specified. **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `typeId` is a null reference (Nothing in Visual Basic). | ### GetTypeInfo static · 4 overloads | Overload | Description | |---|---| | [GetTypeInfo<T>()](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#gettypeinfo-t1)static | Retrieves the [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) which declares the data type implemented by the `T` specified. | | [GetTypeInfo(OpcEncoding)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#gettypeinfo-opc-uafx-opcencoding)static | Retrieves the [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) which declares the data type which is identified by the `encoding` specified. | | [GetTypeInfo(OpcNodeId)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#gettypeinfo-opc-uafx-opcnodeid)static | Retrieves the [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) which declares the data type which is identified by the `typeId` specified. | | [GetTypeInfo(Type)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#gettypeinfo-system-type)static | Retrieves the [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) which declares the data type implemented by the `underlyingType` specified. | #### GetTypeInfo<T>() static Retrieves the [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) which declares the data type implemented by the `T` specified.
```csharp public static OpcDataTypeInfo GetTypeInfo() ```
```vbnet Public Shared Function GetTypeInfo(Of T)() As OpcDataTypeInfo ```
**Type parameters** | Name | Description | |---|---| | `T` | The [Type](https://learn.microsoft.com/dotnet/api/system.type) which implements the [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) to retrieve. | **Returns** [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) The [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) which declares the `T` specified or a null reference (Nothing in Visual Basic) if there isn't a [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) associated with the `T` specified. #### GetTypeInfo(OpcEncoding) static Retrieves the [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) which declares the data type which is identified by the `encoding` specified.
```csharp public static OpcDataTypeInfo GetTypeInfo(OpcEncoding encoding) ```
```vbnet Public Shared Function GetTypeInfo(encoding As OpcEncoding) As OpcDataTypeInfo ```
**Parameters** | Name | Type | Description | |---|---|---| | `encoding` | [OpcEncoding](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcencoding/) | The [OpcEncoding](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcencoding/) which identifies the [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) to retrieve. | **Returns** [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) The [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) which is known under the `encoding` specified or a null reference (Nothing in Visual Basic) if there doesn't exist a known [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) which is associated with the `encoding` specified. **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `encoding` is a null reference (Nothing in Visual Basic). | #### GetTypeInfo(OpcNodeId) static Retrieves the [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) which declares the data type which is identified by the `typeId` specified.
```csharp public static OpcDataTypeInfo GetTypeInfo(OpcNodeId typeId) ```
```vbnet Public Shared Function GetTypeInfo(typeId As OpcNodeId) As OpcDataTypeInfo ```
**Parameters** | Name | Type | Description | |---|---|---| | `typeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) which identifies the [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) to retrieve. | **Returns** [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) The [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) which is known under the `typeId` specified or a null reference (Nothing in Visual Basic) if there doesn't exist a known [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) which is associated with the `typeId` specified. **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `typeId` is a null reference (Nothing in Visual Basic). | #### GetTypeInfo(Type) static Retrieves the [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) which declares the data type implemented by the `underlyingType` specified.
```csharp public static OpcDataTypeInfo GetTypeInfo(Type underlyingType) ```
```vbnet Public Shared Function GetTypeInfo(underlyingType As Type) As OpcDataTypeInfo ```
**Parameters** | Name | Type | Description | |---|---|---| | `underlyingType` | [Type](https://learn.microsoft.com/dotnet/api/system.type) | The [Type](https://learn.microsoft.com/dotnet/api/system.type) which implements the [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) to retrieve. | **Returns** [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) The [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) which declares the `underlyingType` specified or a null reference (Nothing in Visual Basic) if there isn't a [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) associated with the `underlyingType` specified. **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `underlyingType` is a null reference (Nothing in Visual Basic). | ### New static Creates a new instance of the [OpcDataObject](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdataobject/) class using the `dataType` specified.
```csharp public static OpcDataObject New(OpcDataTypeInfo dataType) ```
```vbnet Public Shared Function [New](dataType As OpcDataTypeInfo) As OpcDataObject ```
**Parameters** | Name | Type | Description | |---|---|---| | `dataType` | [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) | The [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) which declares the type of data type instance the new [OpcDataObject](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdataobject/) shall represent. | **Returns** [OpcDataObject](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdataobject/) An instance of the [OpcDataObject](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdataobject/) which can be used to dynamically access data type instance information. **Exceptions** | Exception | Condition | |---|---| | [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `dataType` is not a structured data type (see [IsStruct](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/members#isstruct)). | | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `dataType` is a null reference (Nothing in Visual Basic). | ### NewArray static Creates a one-dimensional array of [OpcDataObject](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdataobject/) objects using the `dataType` and `length` with zero-based indexing.
```csharp public static OpcDataObject[] NewArray(OpcDataTypeInfo dataType, int length) ```
```vbnet Public Shared Function NewArray( dataType As OpcDataTypeInfo, length As Integer) As OpcDataObject() ```
**Parameters** | Name | Type | Description | |---|---|---| | `dataType` | [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) | The [OpcDataTypeInfo](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/) which declares the type of data type instance the new [OpcDataObject](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdataobject/) shall represent. | | `length` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) | An size of the array to create. | **Returns** [OpcDataObject](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdataobject/)[] A new one-dimensional array of [OpcDataObject](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdataobject/) instances which can be used to dynamically access array-based data type information **Exceptions** | Exception | Condition | |---|---| | [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `dataType` is not a structured data type (see [IsStruct](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeinfo/members#isstruct)). | | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `dataType` is a null reference (Nothing in Visual Basic). | ### RegisterType static · 6 overloads | Overload | Description | |---|---| | [RegisterType<T>()](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#registertype-t1)static | Registers the type defined by `T` as the data object type to create in case there a data instance is to be created for the type definition identified by the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/) defined on the `T` specified. | | [RegisterType(Type)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#registertype-system-type)static · since v2.14 | Registers the `dataType` specified as the data object type to create in case there a data instance is to be created for the type definition identified by the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/) defined on the `dataType` specified. | | [RegisterType<T>(OpcNodeId)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#registertype-t1-opc-uafx-opcnodeid)static | Registers the type defined by `T` as the data object type to create in case there a data instance is to be created for the type definition identified by the `dataTypeId` specified. | | [RegisterType(Type, OpcNodeId)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#registertype-system-type-opc-uafx-opcnodeid)static · since v2.14 | Registers the `dataType` specified as the data object type to create in case there a data instance is to be created for the type definition identified by the `dataTypeId` specified. | | [RegisterType<T>(OpcNodeId, params OpcEncoding\[\])](#registertype-t1-opc-uafx-opcnodeid-opc-uafx-opcencoding-array)static | Registers the type defined by `T` as the data object type to create in case there a data instance is to be created for the type definition identified by the `dataTypeId` or by one of the `dataTypeEncodings` specified. | | [RegisterType(Type, OpcNodeId, params OpcEncoding\[\])](#registertype-system-type-opc-uafx-opcnodeid-opc-uafx-opcencoding-array)static · since v2.14 | Registers the `dataType` specified as the data object type to create in case there a data instance is to be created for the type definition identified by the `dataTypeId` or by one of the `dataTypeEncodings` specified. | #### RegisterType<T>() static Registers the type defined by `T` as the data object type to create in case there a data instance is to be created for the type definition identified by the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/) defined on the `T` specified.
```csharp public static void RegisterType() ```
```vbnet Public Shared Sub RegisterType(Of T)() ```
**Type parameters** | Name | Description | |---|---| | `T` | The type to use in case there a data object for the data definition equals to the data type identifier defined using the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/) is to be created. The type needs to provide either a public accessible parameterless constructor or a public accessible constructor accepting an instance of the [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) interface and then needs to be a subclass of the [OpcData](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/) class. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The type `T` does not define a public accessible parameterless constructor or a public accessible constructor accepting an instance of the [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) interface or any data type specific attribute offers invalid information about the data type to associate with the [Type](https://learn.microsoft.com/dotnet/api/system.type). | #### RegisterType(Type) static · since v2.14 Registers the `dataType` specified as the data object type to create in case there a data instance is to be created for the type definition identified by the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/) defined on the `dataType` specified.
```csharp public static void RegisterType(Type dataType) ```
```vbnet Public Shared Sub RegisterType(dataType As Type) ```
**Parameters** | Name | Type | Description | |---|---|---| | `dataType` | [Type](https://learn.microsoft.com/dotnet/api/system.type) | The [Type](https://learn.microsoft.com/dotnet/api/system.type) to use in case there a data object for the data type definition equals to the data type identifier defined using the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/) is to be created. The type needs to provide either a public accessible parameterless constructor or a public accessible constructor accepting an instance of the [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) interface and then needs to be a subclass of the [OpcData](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/) class. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `dataType` does not define a public accessible parameterless constructor or a public accessible constructor accepting an instance of the [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) interface or any data type specific attribute offers invalid information about the data type to associate with the [Type](https://learn.microsoft.com/dotnet/api/system.type). | | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `dataType` is a null reference (Nothing in Visual Basic). | #### RegisterType<T>(OpcNodeId) static Registers the type defined by `T` as the data object type to create in case there a data instance is to be created for the type definition identified by the `dataTypeId` specified.
```csharp public static void RegisterType(OpcNodeId dataTypeId) ```
```vbnet Public Shared Sub RegisterType(Of T)(dataTypeId As OpcNodeId) ```
**Type parameters** | Name | Description | |---|---| | `T` | The type to use in case there a data object for the data definition equals to `dataTypeId` is to be created. The type needs to provide either a public accessible parameterless constructor or a public accessible constructor accepting an instance of the [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) interface and then needs to be a subclass of the [OpcData](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/) class. | **Parameters** | Name | Type | Description | |---|---|---| | `dataTypeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The identifier of the type definition for which the `T` is to be used to create a data object instance. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The type `T` does not define a public accessible parameterless constructor or a public accessible constructor accepting an instance of the [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) interface or any data type specific attribute offers invalid information about the data type to associate with the [Type](https://learn.microsoft.com/dotnet/api/system.type). | | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `dataTypeId` is a null reference (Nothing in Visual Basic). | **Remarks** It is not possible to register the same or a different data type for the `dataTypeId` specified as long there is already a data type registered for the type definition specified by `dataTypeId`. #### RegisterType(Type, OpcNodeId) static · since v2.14 Registers the `dataType` specified as the data object type to create in case there a data instance is to be created for the type definition identified by the `dataTypeId` specified.
```csharp public static void RegisterType(Type dataType, OpcNodeId dataTypeId) ```
```vbnet Public Shared Sub RegisterType(dataType As Type, dataTypeId As OpcNodeId) ```
**Parameters** | Name | Type | Description | |---|---|---| | `dataType` | [Type](https://learn.microsoft.com/dotnet/api/system.type) | The [Type](https://learn.microsoft.com/dotnet/api/system.type) to use in case there a data object for the data type definition equals to `dataTypeId` is to be created. The type needs to provide either a public accessible parameterless constructor or a public accessible constructor accepting an instance of the [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) interface and then needs to be a subclass of the [OpcData](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/) class. | | `dataTypeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The identifier of the type definition for which the `dataType` is to be used to create a data object instance. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `dataType` does not define a public accessible parameterless constructor or a public accessible constructor accepting an instance of the [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) interface or any data type specific attribute offers invalid information about the data type to associate with the [Type](https://learn.microsoft.com/dotnet/api/system.type). | | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `dataType` or `dataTypeId` is a null reference (Nothing in Visual Basic). | **Remarks** It is not possible to register the same or a different data type for the `dataTypeId` specified as long there is already a data type registered for the type definition specified by `dataTypeId`. #### RegisterType<T>(OpcNodeId, params OpcEncoding\[\]) static Registers the type defined by `T` as the data object type to create in case there a data instance is to be created for the type definition identified by the `dataTypeId` or by one of the `dataTypeEncodings` specified.
```csharp public static void RegisterType( OpcNodeId dataTypeId, params OpcEncoding[] dataTypeEncodings) ```
```vbnet Public Shared Sub RegisterType(Of T)( dataTypeId As OpcNodeId, ParamArray dataTypeEncodings As OpcEncoding()) ```
**Type parameters** | Name | Description | |---|---| | `T` | The type to use in case there a data object for the data definition equals to `dataTypeId` or equals to one of the `dataTypeEncodings` specified is to be created. The type needs to provide either a public accessible parameterless constructor or a public accessible constructor accepting an instance of the [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) interface and then needs to be a subclass of the [OpcData](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/) class. | **Parameters** | Name | Type | Description | |---|---|---| | `dataTypeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The identifier of the type definition for which the `T` is to be used to create a data object instance. | | `dataTypeEncodings` | params [OpcEncoding](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcencoding/)[] | An array of [OpcEncoding](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcencoding/) instances identifying the different encodings supported by the `T` specified. Using [OpcEncoding](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcencoding/) instances enables the possibility to define [OpcEncodingType](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcencodingtype/) specific identifiers to use to identify the according encoding information required to encode or decode the data object information. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The type `T` does not define a public accessible parameterless constructor or a public accessible constructor accepting an instance of the [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) interface or any data type specific attribute offers invalid information about the data type to associate with the [Type](https://learn.microsoft.com/dotnet/api/system.type). | | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `dataTypeId` or `dataTypeEncodings` or one of its items is a null reference (Nothing in Visual Basic). | #### RegisterType(Type, OpcNodeId, params OpcEncoding\[\]) static · since v2.14 Registers the `dataType` specified as the data object type to create in case there a data instance is to be created for the type definition identified by the `dataTypeId` or by one of the `dataTypeEncodings` specified.
```csharp public static void RegisterType( Type dataType, OpcNodeId dataTypeId, params OpcEncoding[] dataTypeEncodings) ```
```vbnet Public Shared Sub RegisterType( dataType As Type, dataTypeId As OpcNodeId, ParamArray dataTypeEncodings As OpcEncoding()) ```
**Parameters** | Name | Type | Description | |---|---|---| | `dataType` | [Type](https://learn.microsoft.com/dotnet/api/system.type) | The [Type](https://learn.microsoft.com/dotnet/api/system.type) to use in case there a data object for the data type definition equals to the data type identifier defined using the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/) is to be created. The type needs to provide either a public accessible parameterless constructor or a public accessible constructor accepting an instance of the [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) interface and then needs to be a subclass of the [OpcData](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/) class. | | `dataTypeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The identifier of the type definition for which the `dataType` is to be used to create a data object instance. | | `dataTypeEncodings` | params [OpcEncoding](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcencoding/)[] | An array of [OpcEncoding](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcencoding/) instances identifying the different encodings supported by the `dataType` specified. Using [OpcEncoding](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcencoding/) instances enables the possibility to define [OpcEncodingType](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcencodingtype/) specific identifiers to use to identify the according encoding information required to encode or decode the data object information. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The type `dataType` does not define a public accessible parameterless constructor or a public accessible constructor accepting an instance of the [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) interface or any data type specific attribute offers invalid information about the data type to associate with the [Type](https://learn.microsoft.com/dotnet/api/system.type). | | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `dataType`, `dataTypeId` or `dataTypeEncodings` or one of its items is a null reference (Nothing in Visual Basic). | ### RegisterTypeMapper static · 2 overloads · since v2.27 | Overload | Description | |---|---| | [RegisterTypeMapper<T>()](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#registertypemapper-t1)static · since v2.27 | Registers the `T` implementing the [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) interface as a custom mapper for data types. | | [RegisterTypeMapper(IOpcDataTypeMapper)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#registertypemapper-opc-uafx-iopcdatatypemapper)static · since v2.27 | Registers the `mapper` as a custom mapper for data types. | #### RegisterTypeMapper<T>() static · since v2.27 Registers the `T` implementing the [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) interface as a custom mapper for data types.
```csharp public static void RegisterTypeMapper() where T : IOpcDataTypeMapper, new() ```
```vbnet Public Shared Sub RegisterTypeMapper(Of T As {IOpcDataTypeMapper, New})() ```
**Type parameters** | Name | Description | |---|---| | `T` | The type implementing the [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) interface and providing a default constructor. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `T` does not inherit from [OpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypemapper/) nor defines any [OpcDataTypeMapperAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypemapperattribute/) to indicate which types are mapped to each other. | #### RegisterTypeMapper(IOpcDataTypeMapper) static · since v2.27 Registers the `mapper` as a custom mapper for data types.
```csharp public static void RegisterTypeMapper(IOpcDataTypeMapper mapper) ```
```vbnet Public Shared Sub RegisterTypeMapper(mapper As IOpcDataTypeMapper) ```
**Parameters** | Name | Type | Description | |---|---|---| | `mapper` | [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) | The [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) to register. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `mapper` does not inherit from [OpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypemapper/) nor defines any [OpcDataTypeMapperAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypemapperattribute/) to indicate which types are mapped to each other. | | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `mapper` is a null reference (Nothing in Visual Basic). | ### RegisterTypes static · 3 overloads | Overload | Description | |---|---| | [RegisterTypes(Assembly)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#registertypes-system-reflection-assembly)static | Registers all non-abstract types in the `assembly` specified which defines the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/). | | [RegisterTypes(IEnumerable<Type>)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#registertypes-system-collections-generic-ienumerable-of-system-type)static | Registers the `dataTypes` specified as the data object type to create in case there a data instance is to be created for the type definitions identified by the [OpcEventTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventtypeattribute/) used on one of the `dataTypes` specified. | | [RegisterTypes(Type, params Type\[\])](#registertypes-system-type-system-type-array)static | Registers the `dataType` and the further specified `dataTypes` as the data object type to create in case there a data instance is to be created for the type definition identified by the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/) used on the `dataType` or on one of the `dataTypes` specified. | **Exceptions (all overloads)** | Exception | Condition | |---|---| | [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | A [Type](https://learn.microsoft.com/dotnet/api/system.type) does not define a public accessible parameterless constructor or a public accessible constructor accepting an instance of the [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) interface or any data type specific attribute offers invalid information about the data type to associate with the [Type](https://learn.microsoft.com/dotnet/api/system.type). | #### RegisterTypes(Assembly) static Registers all non-abstract types in the `assembly` specified which defines the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/).
```csharp public static void RegisterTypes(Assembly assembly) ```
```vbnet Public Shared Sub RegisterTypes(assembly As Assembly) ```
**Parameters** | Name | Type | Description | |---|---|---| | `assembly` | [Assembly](https://learn.microsoft.com/dotnet/api/system.reflection.assembly) | The [Assembly](https://learn.microsoft.com/dotnet/api/system.reflection.assembly) its types are inspected for types which using the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/). | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `assembly` is a null reference (Nothing in Visual Basic). | **Remarks** The [Type](https://learn.microsoft.com/dotnet/api/system.type) instances to register need to define the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/) and either a public accessible parameterless constructor or a public accessible constructor accepting an instance of the [IOpcDataStore](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatastore/) interface and then needs to be a subclass of the [OpcData](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/) class. #### RegisterTypes(IEnumerable<Type>) static Registers the `dataTypes` specified as the data object type to create in case there a data instance is to be created for the type definitions identified by the [OpcEventTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventtypeattribute/) used on one of the `dataTypes` specified.
```csharp public static void RegisterTypes(IEnumerable dataTypes) ```
```vbnet Public Shared Sub RegisterTypes(dataTypes As IEnumerable(Of Type)) ```
**Parameters** | Name | Type | Description | |---|---|---| | `dataTypes` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)<[Type](https://learn.microsoft.com/dotnet/api/system.type)> | A sequence of [Type](https://learn.microsoft.com/dotnet/api/system.type) instances representing the types to use in case there a data object for the data definition equals to the data type identifier defined using the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/) is to be created. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `dataTypes` is a null reference (Nothing in Visual Basic). | **Remarks** Any null reference (Nothing in Visual Basic) in `dataTypes` is ignored. #### RegisterTypes(Type, params Type\[\]) static Registers the `dataType` and the further specified `dataTypes` as the data object type to create in case there a data instance is to be created for the type definition identified by the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/) used on the `dataType` or on one of the `dataTypes` specified.
```csharp public static void RegisterTypes(Type dataType, params Type[] dataTypes) ```
```vbnet Public Shared Sub RegisterTypes( dataType As Type, ParamArray dataTypes As Type()) ```
**Parameters** | Name | Type | Description | |---|---|---| | `dataType` | [Type](https://learn.microsoft.com/dotnet/api/system.type) | The [Type](https://learn.microsoft.com/dotnet/api/system.type) instance to use in case there a data object for the data definition equals to the data type identifier defined using the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/) is to be created. | | `dataTypes` | params [Type](https://learn.microsoft.com/dotnet/api/system.type)[] | An array of additional [Type](https://learn.microsoft.com/dotnet/api/system.type) instances to use in case there a data object for the data definitions equals to the data type identifier defined using the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/) is to be created. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `dataType` or `dataTypes` is a null reference (Nothing in Visual Basic). | ### ShallowCopy protected · virtual Creates a shallow copy of the current [OpcData](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/).
```csharp protected virtual object ShallowCopy() ```
```vbnet Protected Overridable Function ShallowCopy() As Object ```
**Returns** [Object](https://learn.microsoft.com/dotnet/api/system.object) A new object which is a shallow copy of the current [OpcData](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/). ### ToExtension static · since v2.40 Wraps the `instance` into an ExtensionObject, so that it can be encoded as the instance of its data type.
```csharp public static ExtensionObject ToExtension(object instance) ```
```vbnet Public Shared Function ToExtension(instance As Object) As ExtensionObject ```
**Parameters** | Name | Type | Description | |---|---|---| | `instance` | [Object](https://learn.microsoft.com/dotnet/api/system.object) | The instance of a data type to wrap. | **Returns** ExtensionObject A new ExtensionObject whose body holds the `instance` wrapped for the encoding (see [To](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.extensionobjectextensions/members#to)), or the `instance` itself if it already is an ExtensionObject. ### TryGetTypeMapper static · 3 overloads · since v2.27 | Overload | Description | |---|---| | [TryGetTypeMapper<TSource>(out IOpcDataTypeMapper)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#trygettypemapper-t1-opc-uafx-iopcdatatypemapper-ref)static · since v2.27 | Determines the [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) associated with the type specified by `TSource`. | | [TryGetTypeMapper(Type, out IOpcDataTypeMapper)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#trygettypemapper-system-type-opc-uafx-iopcdatatypemapper-ref)static · since v2.27 | Determines the [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) associated with the type specified by `sourceType`. | | [TryGetTypeMapper(Type, out IOpcDataTypeMapper, out Type)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#trygettypemapper-system-type-opc-uafx-iopcdatatypemapper-ref-system-type-ref)static · since v2.27 | Determines the [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) associated with the type specified by `sourceType` and the resulting `targetType`. | #### TryGetTypeMapper<TSource>(out IOpcDataTypeMapper) static · since v2.27 Determines the [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) associated with the type specified by `TSource`.
```csharp public static bool TryGetTypeMapper(out IOpcDataTypeMapper mapper) ```
```vbnet Public Shared Function TryGetTypeMapper(Of TSource)( mapper As IOpcDataTypeMapper) As Boolean ```
**Type parameters** | Name | Description | |---|---| | `TSource` | The [Type](https://learn.microsoft.com/dotnet/api/system.type) its mapper is to be determined. | **Parameters** | Name | Type | Description | |---|---|---| | `mapper` | out [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) | The [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) which is responsible for [object](https://learn.microsoft.com/dotnet/api/system.object)'s of the type specified by `TSource` or a null reference (Nothing in Visual Basic) if there does not exist a mapper for the type specified by `TSource`. | **Returns** [Boolean](https://learn.microsoft.com/dotnet/api/system.boolean) The value true if a mapper exists for the type specified by the `TSource` type; otherwise the value false. #### TryGetTypeMapper(Type, out IOpcDataTypeMapper) static · since v2.27 Determines the [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) associated with the type specified by `sourceType`.
```csharp public static bool TryGetTypeMapper( Type sourceType, out IOpcDataTypeMapper mapper) ```
```vbnet Public Shared Function TryGetTypeMapper( sourceType As Type, mapper As IOpcDataTypeMapper) As Boolean ```
**Parameters** | Name | Type | Description | |---|---|---| | `sourceType` | [Type](https://learn.microsoft.com/dotnet/api/system.type) | The [Type](https://learn.microsoft.com/dotnet/api/system.type) its mapper is to be determined. | | `mapper` | out [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) | The [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) which is responsible for [object](https://learn.microsoft.com/dotnet/api/system.object)'s of the type specified by `sourceType` or a null reference (Nothing in Visual Basic) if there does not exist a mapper for the type specified by `sourceType`. | **Returns** [Boolean](https://learn.microsoft.com/dotnet/api/system.boolean) The value true if a mapper exists for the type specified by `sourceType`; otherwise the value false. **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `sourceType` is a null reference (Nothing in Visual Basic). | #### TryGetTypeMapper(Type, out IOpcDataTypeMapper, out Type) static · since v2.27 Determines the [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) associated with the type specified by `sourceType` and the resulting `targetType`.
```csharp public static bool TryGetTypeMapper( Type sourceType, out IOpcDataTypeMapper mapper, out Type targetType) ```
```vbnet Public Shared Function TryGetTypeMapper( sourceType As Type, mapper As IOpcDataTypeMapper, targetType As Type) As Boolean ```
**Parameters** | Name | Type | Description | |---|---|---| | `sourceType` | [Type](https://learn.microsoft.com/dotnet/api/system.type) | The [Type](https://learn.microsoft.com/dotnet/api/system.type) its mapper is to be determined. | | `mapper` | out [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) | The [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) which is responsible for [object](https://learn.microsoft.com/dotnet/api/system.object)'s of the type specified by `sourceType` or a null reference (Nothing in Visual Basic) if there does not exist a mapper for the type specified by `sourceType`. | | `targetType` | out [Type](https://learn.microsoft.com/dotnet/api/system.type) | The [Type](https://learn.microsoft.com/dotnet/api/system.type) the `sourceType` is mapped to by the associated `mapper` or a null reference (Nothing in Visual Basic) if there does not exist a mapper for the type specified by `sourceType`. | **Returns** [Boolean](https://learn.microsoft.com/dotnet/api/system.boolean) The value true if a mapper exists for the type specified by `sourceType`; otherwise the value false. **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `sourceType` is a null reference (Nothing in Visual Basic). | ### UnregisterType static · 3 overloads | Overload | Description | |---|---| | [UnregisterType<T>()](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#unregistertype-t1)static | Unregisters the previously registered (see [RegisterType](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#registertype-t1)) type defined by `T` as the [object](https://learn.microsoft.com/dotnet/api/system.object) type to not longer create for the type definition identified by the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/) defined on the `T` specified. | | [UnregisterType<T>(OpcNodeId)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#unregistertype-t1-opc-uafx-opcnodeid)static | Unregisters the previously registered (see [RegisterType](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#registertype-t1-opc-uafx-opcnodeid)) type defined by `T` as the [object](https://learn.microsoft.com/dotnet/api/system.object) type to not longer create for the type definition identified by the `dataTypeId` specified. | | [UnregisterType<T>(OpcNodeId, params OpcEncoding\[\])](#unregistertype-t1-opc-uafx-opcnodeid-opc-uafx-opcencoding-array)static | Unregisters the previously registered (see [RegisterType](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#registertype-t1-opc-uafx-opcnodeid-opc-uafx-opcencoding-array)) type defined by `T` as the [object](https://learn.microsoft.com/dotnet/api/system.object) type to not longer create for the type definition identified by the `dataTypeId` or by one of the `dataTypeEncodings` specified. | #### UnregisterType<T>() static Unregisters the previously registered (see [RegisterType](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#registertype-t1)) type defined by `T` as the [object](https://learn.microsoft.com/dotnet/api/system.object) type to not longer create for the type definition identified by the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/) defined on the `T` specified.
```csharp public static void UnregisterType() ```
```vbnet Public Shared Sub UnregisterType(Of T)() ```
**Type parameters** | Name | Description | |---|---| | `T` | The data type to unregister for the data definition equals to data type identifier defined using the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/). | #### UnregisterType<T>(OpcNodeId) static Unregisters the previously registered (see [RegisterType](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#registertype-t1-opc-uafx-opcnodeid)) type defined by `T` as the [object](https://learn.microsoft.com/dotnet/api/system.object) type to not longer create for the type definition identified by the `dataTypeId` specified.
```csharp public static void UnregisterType(OpcNodeId dataTypeId) ```
```vbnet Public Shared Sub UnregisterType(Of T)(dataTypeId As OpcNodeId) ```
**Type parameters** | Name | Description | |---|---| | `T` | The data type to unregister for the data definition equals to `dataTypeId`. | **Parameters** | Name | Type | Description | |---|---|---| | `dataTypeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The identifier of the type definition for which the `T` is to be unregistered. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `dataTypeId` is a null reference (Nothing in Visual Basic). | #### UnregisterType<T>(OpcNodeId, params OpcEncoding\[\]) static Unregisters the previously registered (see [RegisterType](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#registertype-t1-opc-uafx-opcnodeid-opc-uafx-opcencoding-array)) type defined by `T` as the [object](https://learn.microsoft.com/dotnet/api/system.object) type to not longer create for the type definition identified by the `dataTypeId` or by one of the `dataTypeEncodings` specified.
```csharp public static void UnregisterType( OpcNodeId dataTypeId, params OpcEncoding[] dataTypeEncodings) ```
```vbnet Public Shared Sub UnregisterType(Of T)( dataTypeId As OpcNodeId, ParamArray dataTypeEncodings As OpcEncoding()) ```
**Type parameters** | Name | Description | |---|---| | `T` | The data type to unregister for the data definition equals to `dataTypeId` or one of the `dataTypeEncodings`. | **Parameters** | Name | Type | Description | |---|---|---| | `dataTypeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | The identifier of the type definition for which the `T` is to be unregistered. | | `dataTypeEncodings` | params [OpcEncoding](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcencoding/)[] | An array of [OpcEncoding](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcencoding/) instances identifying the different encodings supported by the `T` specified for which the `T` is to be unregistered as well. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `dataTypeId` or `dataTypeEncodings` or one of its items is a null reference (Nothing in Visual Basic). | ### UnregisterTypeMapper static · 2 overloads · since v2.27 | Overload | Description | |---|---| | [UnregisterTypeMapper<T>()](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#unregistertypemapper-t1)static · since v2.27 | Unregisters the `T` implementing the [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) interface as a custom mapper for data types. | | [UnregisterTypeMapper(IOpcDataTypeMapper)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#unregistertypemapper-opc-uafx-iopcdatatypemapper)static · since v2.27 | Unregisters the `mapper` as a custom mapper for data types. | #### UnregisterTypeMapper<T>() static · since v2.27 Unregisters the `T` implementing the [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) interface as a custom mapper for data types.
```csharp public static void UnregisterTypeMapper() where T : IOpcDataTypeMapper, new() ```
```vbnet Public Shared Sub UnregisterTypeMapper(Of T As {IOpcDataTypeMapper, New})() ```
**Type parameters** | Name | Description | |---|---| | `T` | The type implementing the [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) interface. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `T` does not inherit from [OpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypemapper/) nor defines any [OpcDataTypeMapperAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypemapperattribute/) to indicate which types are mapped to each other. | #### UnregisterTypeMapper(IOpcDataTypeMapper) static · since v2.27 Unregisters the `mapper` as a custom mapper for data types.
```csharp public static void UnregisterTypeMapper(IOpcDataTypeMapper mapper) ```
```vbnet Public Shared Sub UnregisterTypeMapper(mapper As IOpcDataTypeMapper) ```
**Parameters** | Name | Type | Description | |---|---|---| | `mapper` | [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) | The [IOpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.iopcdatatypemapper/) to unregister. | **Exceptions** | Exception | Condition | |---|---| | [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | The `mapper` does not inherit from [OpcDataTypeMapper](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypemapper/) nor defines any [OpcDataTypeMapperAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypemapperattribute/) to indicate which types are mapped to each other. | | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `mapper` is a null reference (Nothing in Visual Basic). | ### UnregisterTypes static · 3 overloads | Overload | Description | |---|---| | [UnregisterTypes(Assembly)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#unregistertypes-system-reflection-assembly)static | Unregisters all previously registered types (see [RegisterTypes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#registertypes-system-reflection-assembly)) in the `assembly` specified. | | [UnregisterTypes(IEnumerable<Type>)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#unregistertypes-system-collections-generic-ienumerable-of-system-type)static | Unregisters the previously registered (see [RegisterTypes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#registertypes-system-collections-generic-ienumerable-of-system-type)) `dataTypes` specified. | | [UnregisterTypes(Type, params Type\[\])](#unregistertypes-system-type-system-type-array)static | Unregisters the previously registered `dataType` and the further specified `dataTypes` (see [RegisterTypes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#registertypes-system-type-system-type-array)). | #### UnregisterTypes(Assembly) static Unregisters all previously registered types (see [RegisterTypes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#registertypes-system-reflection-assembly)) in the `assembly` specified.
```csharp public static void UnregisterTypes(Assembly assembly) ```
```vbnet Public Shared Sub UnregisterTypes(assembly As Assembly) ```
**Parameters** | Name | Type | Description | |---|---|---| | `assembly` | [Assembly](https://learn.microsoft.com/dotnet/api/system.reflection.assembly) | The [Assembly](https://learn.microsoft.com/dotnet/api/system.reflection.assembly) its types are inspected for types using the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/). | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `assembly` is a null reference (Nothing in Visual Basic). | #### UnregisterTypes(IEnumerable<Type>) static Unregisters the previously registered (see [RegisterTypes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#registertypes-system-collections-generic-ienumerable-of-system-type)) `dataTypes` specified.
```csharp public static void UnregisterTypes(IEnumerable dataTypes) ```
```vbnet Public Shared Sub UnregisterTypes(dataTypes As IEnumerable(Of Type)) ```
**Parameters** | Name | Type | Description | |---|---|---| | `dataTypes` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)<[Type](https://learn.microsoft.com/dotnet/api/system.type)> | A sequence of [Type](https://learn.microsoft.com/dotnet/api/system.type) instances to unregister for the data definitions equals to the data type identifiers defined using the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/). | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `dataTypes` is a null reference (Nothing in Visual Basic). | #### UnregisterTypes(Type, params Type\[\]) static Unregisters the previously registered `dataType` and the further specified `dataTypes` (see [RegisterTypes](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdata/members#registertypes-system-type-system-type-array)).
```csharp public static void UnregisterTypes(Type dataType, params Type[] dataTypes) ```
```vbnet Public Shared Sub UnregisterTypes( dataType As Type, ParamArray dataTypes As Type()) ```
**Parameters** | Name | Type | Description | |---|---|---| | `dataType` | [Type](https://learn.microsoft.com/dotnet/api/system.type) | The [Type](https://learn.microsoft.com/dotnet/api/system.type) instance to unregister for the data definitions equals to the data type identifiers defined using the [OpcDataTypeAttribute](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatatypeattribute/). | | `dataTypes` | params [Type](https://learn.microsoft.com/dotnet/api/system.type)[] | | **Exceptions** | Exception | Condition | |---|---| | [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | The `dataType` or `dataTypes` is a null reference (Nothing in Visual Basic). | ## Events ### TypeResolve static Occurs when the resolution of a data type fails. Use this event to manually provide the [Type](https://learn.microsoft.com/dotnet/api/system.type) to use for a specific data type definition identifier.
```csharp public static event OpcTypeResolveEventHandler TypeResolve ```
```vbnet Public Shared Event TypeResolve As OpcTypeResolveEventHandler ```
**Event type** [OpcTypeResolveEventHandler](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctyperesolveeventhandler/)