DataSourcePropertyIsNullMode Enum

Specifies the mode used to populate the data source for a List View displayed in a Lookup Property Editor or List View invoked by the LinkUnlinkController.LinkAction Action in a popup window.

Namespace: DevExpress.Persistent.Base

Assembly: DevExpress.ExpressApp.v22.1.dll

Declaration

C#

public enum DataSourcePropertyIsNullMode

VB.NET

Public Enum DataSourcePropertyIsNullMode

Members

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.

Related API Members

The following properties accept/return DataSourcePropertyIsNullMode values:

• DataSourcePropertyAttribute.DataSourcePropertyIsNullMode
• IModelCommonMemberViewItem.DataSourcePropertyIsNullMode
• LookupEditPropertyCollectionSource.DataSourcePropertyIsNullMode

Remarks

These enumeration values are passed to the DataSourcePropertyAttribute.DataSourcePropertyIsNullMode property.

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the DataSourcePropertyIsNullMode enum.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

XAF_how-to-access-the-documentmanager-barmanager-and-ribboncontrol-e4027/CS/TabsLayoutCustomization.Module/BusinessObjects/Contact.cs#L27

}
[DataSourceProperty("Department.Contacts", DataSourcePropertyIsNullMode.SelectAll)]
[DataSourceCriteria("Position.Title = 'Manager'")]

VB.NET

XAF_how-to-access-the-documentmanager-barmanager-and-ribboncontrol-e4027/VB/TabsLayoutCustomization.Module/BusinessObjects/Contact.vb#L36

End Property
<DataSourceProperty("Department.Contacts", DataSourcePropertyIsNullMode.SelectAll), DataSourceCriteria("Position.Title = 'Manager'")> _
Public Property Manager() As Contact