# IsDefinitionOnly Property

## Overloads

| [IsDefinitionOnly](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.FieldDescription.IsDefinitionOnly.htm#Qlik_Engine_FieldDescription_IsDefinitionOnly) |  | If set to true, it means that the field is a field on the fly.<br><br>The default value is false.<br><br>JSON property name: qIsDefinitionOnly |
| --- | --- | --- |

[](https://help.qlik.com/en-US/sense-developer/Subsystems/NetSDKAPIref/Content/Qlik.Engine.FieldDescription.IsDefinitionOnly.htm) [](https://help.qlik.com/en-US/sense-developer/Subsystems/NetSDKAPIref/Content/Qlik.Engine.FieldDescription.IsDefinitionOnly.htm)

## IsDefinitionOnly

If set to true, it means that the field is a field on the fly.

The default value is false.

JSON property name: qIsDefinitionOnly

### Declaration

```

          public bool IsDefinitionOnly { get; set; }
    
  
```

### Property Value

| Type | Description |
| --- | --- |
| System.Boolean |  |

### Implements

[IFieldDescription.IsDefinitionOnly](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IFieldDescription.IsDefinitionOnly.htm#Qlik_Engine_IFieldDescription_IsDefinitionOnly)