# OpcDataChangeFilter Members

> Reference: Defines the conditions under which a data change notification is to be reported.

<dl class="api-definition">
<dt>Type</dt>
<dd><a href="./">OpcDataChangeFilter</a></dd>
<dt>Namespace</dt>
<dd><a href="../namespaces/opc.uafx">Opc.UaFx</a></dd>
<dt>Assembly</dt>
<dd>Opc.UaFx.Advanced.dll</dd>
<dt>Package</dt>
<dd>Opc.UaFx.Advanced v2.59.0</dd>
<dt>Also in</dt>
<dd>Opc.UaFx.Client</dd>
</dl>

## Constructors

### OpcDataChangeFilter

<span class="api-meta">2 overloads</span>

| Overload | Description |
|---|---|
| [OpcDataChangeFilter()](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/members#opcdatachangefilter-noparams) | Initializes a new instance of the [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) class. |
| [OpcDataChangeFilter(OpcDataChangeTrigger)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/members#opcdatachangefilter-opc-uafx-opcdatachangetrigger)<span class="api-meta">since v2.6</span> | Initializes a new instance of the [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) class using the `trigger` specified to use as the initial value of the [Trigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/members#trigger) property. |

#### OpcDataChangeFilter()

Initializes a new instance of the [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) class.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcDataChangeFilter()
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Sub New()
```

</div>

#### OpcDataChangeFilter(OpcDataChangeTrigger)

<span class="api-meta">since v2.6</span>

Initializes a new instance of the [OpcDataChangeFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/) class using the `trigger` specified to use as the initial value of the [Trigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/members#trigger) property.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcDataChangeFilter(OpcDataChangeTrigger trigger)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Sub New(trigger As OpcDataChangeTrigger)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `trigger` | [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) | One of the values defined by the [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) enumeration which specifies the conditions under which a data change notification is to be reported. |

## Properties

### DeadbandType

<span class="api-meta">since v2.6</span>

Gets or sets a value which defines how value changes shall be classified as part of the 'deadband' or the 'liveband'. Only value changes within the 'liveband' are reported.

<div class="api-signature" data-lang="csharp">

```csharp
public OpcDeadbandType DeadbandType { get; set; }
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Property DeadbandType As OpcDeadbandType
```

</div>

**Property value**

[OpcDeadbandType](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdeadbandtype/)

One of the members defined by the [OpcDeadbandType](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdeadbandtype/) enumeration. The value [None](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdeadbandtype/#none) indicates that every value change will be reported. For more information about the use of different values see [OpcDeadbandType](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdeadbandtype/).

### DeadbandValue

<span class="api-meta">since v2.6</span>

Gets or sets the limit of the 'band'-logic used to classify value changes as part of the 'deadband' or the 'liveband'. The interpretation of the [DeadbandValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/members#deadbandvalue) depends on the value of the [DeadbandType](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/members#deadbandtype) property.

<div class="api-signature" data-lang="csharp">

```csharp
public double DeadbandValue { get; set; }
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Property DeadbandValue As Double
```

</div>

**Property value**

[Double](https://learn.microsoft.com/dotnet/api/system.double)

A value indicating the limit upon a value change is reported or not. For more information about the interpretation of the value see [DeadbandType](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangefilter/members#deadbandtype).

### Trigger

<span class="api-meta">since v2.6</span>

Gets or sets a value which specifies the conditions under which a data change notification is to be reported. The default value is [StatusValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/#statusvalue).

<div class="api-signature" data-lang="csharp">

```csharp
public OpcDataChangeTrigger Trigger { get; set; }
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Property Trigger As OpcDataChangeTrigger
```

</div>

**Property value**

[OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/)

One of the members defined by the [OpcDataChangeTrigger](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcdatachangetrigger/) enumeration.