# ExtensionListDef Class

Namespace: [Qlik.Engine](https://help.qlik.com/en-US/sense-developer/May2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.htm)  
Assembly: Qlik.Engine.dll

Obsolete, use qrs API's to fetch extensions.

## Inheritance

* System.Object
  * [AbstractStructure](https://help.qlik.com/en-US/sense-developer/May2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.AbstractStructure.htm)
    * ExtensionListDef

## Syntax

```
[ValueClass]
public class ExtensionListDef : AbstractStructure, IDisposable, IExtensionListDef, IAbstractStructure
```

## Constructors

| Name | Description |
| --- | --- |
| [ExtensionListDef()](https://help.qlik.com/en-US/sense-developer/May2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.ExtensionListDef.-ctor.htm#Qlik_Engine_ExtensionListDef__ctor) |  |