Applied to business classes' reference and collection properties. Specifies the criteria expression used to filter the List View displayed in a Lookup Property Editor or invoked by the LinkUnlinkController.LinkAction Action in a popup window.
[AttributeUsage(AttributeTargets.Property, Inherited = true, AllowMultiple = false)] public sealed class DataSourceCriteriaAttribute : ModelExportedValueAttribute
<AttributeUsage(AttributeTargets.Property, Inherited:=True, AllowMultiple:=False)> Public NotInheritable Class DataSourceCriteriaAttribute Inherits ModelExportedValueAttribute
You can filter the data source for the List View displayed in a Lookup Property Editor or in the LinkUnlinkController.LinkAction Action's popup window. For this purpose, apply the DataSourceCriteria attribute to the target property. Specify a criteria for filtering via the attribute's dataSourceCriteria parameter. This value will be assigned to the IModelCommonMemberViewItem.DataSourceCriteria property of the Application Model's BOModel | <Class> | OwnMembers | <Member> node. Note, you can set or change this property's value directly in the Application Model via the Model Editor.
An object which is added to a lookup via the New Action is always displayed, regardless of whether or not the DataSourceProperty or DataSourceCriteria attributes are applied.
When using the @This. prefix in DataSourceCriteria, note that the master object (for which the lookup editor is displayed) is referred to, even if the lookup displays a complex property. For instance, if the lookup property is Task.Project.Manager, then @This refers to Task and not to Project.
For details on this and other techniques of Lookup Property Editor data source filtering, refer to the How to: Implement Cascading Filtering for Lookup List Views.