# NxListObjectExpressionDef Class

Namespace: [Qlik.Engine](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.htm)  
Assembly: Qlik.Engine.dll

## Inheritance

* System.Object
  * [AbstractStructure](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.AbstractStructure.htm)
    * NxListObjectExpressionDef

      [](https://help.qlik.com/en-US/sense-developer/Subsystems/NetSDKAPIref/Content/Qlik.Engine.NxListObjectExpressionDef.htm)
      #### Derived Classes
      * [ListObjectExpressionDef](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Sense.Client.Visualizations.MapComponents.ListObjectExpressionDef.htm)

## Syntax

```
[ValueClass]
public class NxListObjectExpressionDef : AbstractStructure, IDisposable, INxListObjectExpressionDef, IAbstractStructure
```

## Constructors

| Name | Description |
| --- | --- |
| [NxListObjectExpressionDef()](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.NxListObjectExpressionDef.-ctor.htm#Qlik_Engine_NxListObjectExpressionDef__ctor) | Creates an instance of the NxListObjectExpressionDef class |

## Properties

| Name | Description |
| --- | --- |
| [Expr](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.NxListObjectExpressionDef.Expr.htm#Qlik_Engine_NxListObjectExpressionDef_Expr) | Value of the expression.<br><br>JSON property name: qExpr |
| [LibraryId](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.NxListObjectExpressionDef.LibraryId.htm#Qlik_Engine_NxListObjectExpressionDef_LibraryId) | Refers to an expression stored in the library.<br><br>JSON property name: qLibraryId |