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.v19.1.dll
Declaration
Property Value
Type | Description |
---|---|
DataSourcePropertyIsNullMode | A DataSourcePropertyIsNullMode enumeration value that specifies the Lookup Property Editor’s data source. |
Available values:
Name | Description |
---|---|
SelectNothing | Specifies that the property’s Lookup List View is bound to an empty collection. |
SelectAll | Specifies that the property’s Lookup List View is bound to a collection of all existing persistent objects of the property’s type. |
CustomCriteria | 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 DataSourcePropertyAttribute.DataSourcePropertyIsNullCriteria parameter of the DataSourcePropertyAttribute. |
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 Filter Lookup Editor Data Source topic.