# ApiVersionAttribute Class

Namespace: [PIX](https://help.qlik.com/en-US/qlikview-developer/September2025/Subsystems/QMSAPIref/Content/PIX.htm)  
Assembly: PIX.dll

## Inheritance

* System.Object
  * System.Attribute
    * ApiVersionAttribute

## Syntax

```
[AttributeUsage(AttributeTargets.Field)]
public class ApiVersionAttribute : Attribute, _Attribute
```

## Constructors

| Name | Description |
| --- | --- |
| [ApiVersionAttribute(ApiVersion, Object)](https://help.qlik.com/en-US/qlikview-developer/September2025/Subsystems/QMSAPIref/Content/PIX.ApiVersionAttribute.-ctor.htm#PIX_ApiVersionAttribute__ctor_PIX_ApiVersion_System_Object_) |  |

## Properties

| Name | Description |
| --- | --- |
| [LegacyValue](https://help.qlik.com/en-US/qlikview-developer/September2025/Subsystems/QMSAPIref/Content/PIX.ApiVersionAttribute.LegacyValue.htm#PIX_ApiVersionAttribute_LegacyValue) |  |
| [Version](https://help.qlik.com/en-US/qlikview-developer/September2025/Subsystems/QMSAPIref/Content/PIX.ApiVersionAttribute.Version.htm#PIX_ApiVersionAttribute_Version) |  |

### Extension Methods

[ApiFilter.FilterFor<T>(T, Nullable<ApiVersion>)](https://help.qlik.com/en-US/qlikview-developer/September2025/Subsystems/QMSAPIref/Content/PIX.ApiFiltering.ApiFilter.FilterFor.htm#PIX_ApiFiltering_ApiFilter_FilterFor__1___0_System_Nullable_PIX_ApiVersion__)