DataSourcePropertyAttribute.DataSourcePropertyIsNullMode Property
Specifies the Lookup Property Editor’s data source, in case the collection property specified by the DataSourcePropertyAttribute.DataSourceProperty is set to null (Nothing in VB).
Namespace: DevExpress.Persistent.Base
Assembly: DevExpress.ExpressApp.v24.2.dll
NuGet Package: DevExpress.ExpressApp
#Declaration
public DataSourcePropertyIsNullMode DataSourcePropertyIsNullMode { get; }
#Property Value
Type | Description |
---|---|
Data |
A Data |
Available values:
Name | Description |
---|---|
Select |
Specifies that the property’s Lookup List View is bound to an empty collection. |
Select |
Specifies that the property’s Lookup List View is bound to a collection of all existing persistent objects of the property’s type. |
Custom |
Specifies that the Lookup List View is bound to a collection containing the objects that satisfy the criteria. The criteria should be specified by the Data |
#Remarks
You can change the DataSourcePropertyIsNullMode‘s value specified in code via the BOModel | <Class> | OwnMembers | <Member> node’s IModelCommonMemberViewItem.DataSourcePropertyIsNullMode property in the Model Editor.
To learn how to specify the Lookup Property Editor’s data source via the DataSourcePropertyAttribute, refer to the How to: Implement Cascading Filtering for Lookup List Views topic.