# OpcDiscoveryClient Members
- Type
- OpcDiscoveryClient
- Namespace
- Opc.UaFx.Client
- Assembly
- Opc.UaFx.Advanced.dll
- Package
- Opc.UaFx.Advanced v2.59.0
- Also in
- Opc.UaFx.Client
## Constructors
### OpcDiscoveryClient
4 overloads
| Overload | Description |
|---|---|
| [OpcDiscoveryClient()](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdiscoveryclient/members#opcdiscoveryclient-noparams) | |
| [OpcDiscoveryClient(string)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdiscoveryclient/members#opcdiscoveryclient-system-string) | |
| [OpcDiscoveryClient(Uri)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdiscoveryclient/members#opcdiscoveryclient-system-uri) | |
| [OpcDiscoveryClient(Uri, OpcApplicationConfiguration)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdiscoveryclient/members#opcdiscoveryclient-system-uri-opc-uafx-opcapplicationconfiguration) | |
#### OpcDiscoveryClient()
```csharp
public OpcDiscoveryClient()
```
```vbnet
Public Sub New()
```
#### OpcDiscoveryClient(string)
```csharp
public OpcDiscoveryClient(string discoveryUrl)
```
```vbnet
Public Sub New(discoveryUrl As String)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `discoveryUrl` | [String](https://learn.microsoft.com/dotnet/api/system.string) | |
**Exceptions**
| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) | |
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | |
| [FormatException](https://learn.microsoft.com/dotnet/api/system.formatexception) | |
#### OpcDiscoveryClient(Uri)
```csharp
public OpcDiscoveryClient(Uri discoveryUrl)
```
```vbnet
Public Sub New(discoveryUrl As Uri)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `discoveryUrl` | [Uri](https://learn.microsoft.com/dotnet/api/system.uri) | |
**Exceptions**
| Exception | Condition |
|---|---|
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | |
#### OpcDiscoveryClient(Uri, OpcApplicationConfiguration)
```csharp
public OpcDiscoveryClient(
Uri discoveryUrl,
OpcApplicationConfiguration configuration)
```
```vbnet
Public Sub New(
discoveryUrl As Uri,
configuration As OpcApplicationConfiguration)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `discoveryUrl` | [Uri](https://learn.microsoft.com/dotnet/api/system.uri) | |
| `configuration` | [OpcApplicationConfiguration](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcapplicationconfiguration/) | |
**Exceptions**
| Exception | Condition |
|---|---|
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) | |
## Properties
### Configuration
```csharp
public OpcEndpointConfiguration Configuration { get; }
```
```vbnet
Public ReadOnly Property Configuration As OpcEndpointConfiguration
```
**Property value**
[OpcEndpointConfiguration](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcendpointconfiguration/)
### DiscoveryUrl
```csharp
public Uri DiscoveryUrl { get; }
```
```vbnet
Public ReadOnly Property DiscoveryUrl As Uri
```
**Property value**
[Uri](https://learn.microsoft.com/dotnet/api/system.uri)
## Methods
### Close
```csharp
public OpcStatus Close()
```
```vbnet
Public Function Close() As OpcStatus
```
**Returns**
[OpcStatus](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatus/)
### DiscoverEndpoints
2 overloads
| Overload | Description |
|---|---|
| [DiscoverEndpoints()](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdiscoveryclient/members#discoverendpoints-noparams) | Discovers the endpoints of the server (OPC 10000-4, GetEndpoints). |
| [DiscoverEndpoints(IEnumerable<string>)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdiscoveryclient/members#discoverendpoints-system-collections-generic-ienumerable-of-system-string)since v2.58 | Discovers the endpoints of the server which use one of the transport profiles specified (OPC 10000-4, GetEndpoints). |
**Exceptions (all overloads)**
| Exception | Condition |
|---|---|
| [OpcException](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcexception/) | The server could not be reached or rejected the request, for example because it closed the channel during the handshake. The [Code](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcexception/members#code) states the reason, such as [BadSecureChannelClosed](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badsecurechannelclosed). |
#### DiscoverEndpoints()
Discovers the endpoints of the server (OPC 10000-4, GetEndpoints).
```csharp
public OpcEndpointDescriptionCollection DiscoverEndpoints()
```
```vbnet
Public Function DiscoverEndpoints() As OpcEndpointDescriptionCollection
```
**Returns**
[OpcEndpointDescriptionCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcendpointdescriptioncollection/)
The endpoints the server returned.
#### DiscoverEndpoints(IEnumerable<string>)
since v2.58
Discovers the endpoints of the server which use one of the transport profiles specified (OPC 10000-4, GetEndpoints).
```csharp
public OpcEndpointDescriptionCollection DiscoverEndpoints(
IEnumerable profileUris)
```
```vbnet
Public Function DiscoverEndpoints(
profileUris As IEnumerable(Of String)) As OpcEndpointDescriptionCollection
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `profileUris` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)<[String](https://learn.microsoft.com/dotnet/api/system.string)> | The URIs of the transport profiles the endpoints have to use, for example `http://opcfoundation.org/UA-Profile/Transport/uatcp-uasc-uabinary`. A null reference (Nothing in Visual Basic) or an empty sequence discovers the endpoints of every transport profile. |
**Returns**
[OpcEndpointDescriptionCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcendpointdescriptioncollection/)
The endpoints the server returned for the `profileUris`.
### DiscoverServers
2 overloads
| Overload | Description |
|---|---|
| [DiscoverServers()](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdiscoveryclient/members#discoverservers-noparams) | Discovers the servers known to the discovery server (OPC 10000-4, FindServers). |
| [DiscoverServers(IEnumerable<string>)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdiscoveryclient/members#discoverservers-system-collections-generic-ienumerable-of-system-string)since v2.58 | Discovers the servers known to the discovery server whose application URI is one of the URIs specified (OPC 10000-4, FindServers). |
**Exceptions (all overloads)**
| Exception | Condition |
|---|---|
| [OpcException](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcexception/) | The server could not be reached or rejected the request, for example because it closed the channel during the handshake. The [Code](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcexception/members#code) states the reason, such as [BadSecureChannelClosed](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscode/#badsecurechannelclosed). |
#### DiscoverServers()
Discovers the servers known to the discovery server (OPC 10000-4, FindServers).
```csharp
public OpcApplicationDescriptionCollection DiscoverServers()
```
```vbnet
Public Function DiscoverServers() As OpcApplicationDescriptionCollection
```
**Returns**
[OpcApplicationDescriptionCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcapplicationdescriptioncollection/)
The servers the discovery server returned.
#### DiscoverServers(IEnumerable<string>)
since v2.58
Discovers the servers known to the discovery server whose application URI is one of the URIs specified (OPC 10000-4, FindServers).
```csharp
public OpcApplicationDescriptionCollection DiscoverServers(
IEnumerable serverUris)
```
```vbnet
Public Function DiscoverServers(
serverUris As IEnumerable(Of String)) As OpcApplicationDescriptionCollection
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `serverUris` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)<[String](https://learn.microsoft.com/dotnet/api/system.string)> | The application URIs of the servers to discover. A null reference (Nothing in Visual Basic) or an empty sequence discovers every server. |
**Returns**
[OpcApplicationDescriptionCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcapplicationdescriptioncollection/)
The servers the discovery server returned for the `serverUris`.
### Dispose
2 overloads
| Overload | Description |
|---|---|
| [Dispose()](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdiscoveryclient/members#dispose-noparams) | Releases all resources used by the [OpcDiscoveryClient](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdiscoveryclient/). |
| [Dispose(bool)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdiscoveryclient/members#dispose-system-boolean)protected · virtual | Releases the unmanaged resources used by the [OpcDiscoveryClient](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdiscoveryclient/) and optionally releases the managed resources. |
#### Dispose()
Releases all resources used by the [OpcDiscoveryClient](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdiscoveryclient/).
```csharp
public void Dispose()
```
```vbnet
Public Sub Dispose()
```
**Implements**
[Dispose()](https://learn.microsoft.com/dotnet/api/system.idisposable.dispose)
#### Dispose(bool)
protected · virtual
Releases the unmanaged resources used by the [OpcDiscoveryClient](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcdiscoveryclient/) and optionally releases the managed resources.
```csharp
protected virtual void Dispose(bool disposing)
```
```vbnet
Protected Overridable Sub Dispose(disposing As Boolean)
```
**Parameters**
| Name | Type | Description |
|---|---|---|
| `disposing` | [Boolean](https://learn.microsoft.com/dotnet/api/system.boolean) | The value true to release both managed and unmanaged resources; otherwise the value false to release only unmanaged resources. |