corelibraries-devexpress-dot-data-dot-irelationlist.md
When implemented by a class, returns the number of master-detail relationships for the current master data source.
Namespace : DevExpress.Data
Assembly : DevExpress.Data.v25.2.dll
NuGet Package : DevExpress.Data
int RelationCount { get; }
ReadOnly Property RelationCount As Integer
| Type | Description |
|---|---|
| Int32 |
An integer value that specifies the number of master-detail relationships for the current master data source.
|
This property returns the number of master-detail relationships for a master data source. If it’s set to 0 , master-detail mode is disabled.
If using the IRelationListEx interface instead of the IRelationList, you can provide a different number of relationships for different rows by overriding the IRelationListEx.GetRelationCount method.
When implementing a data source for a GridControl, if the RelationCount property is set to a value greater than 0, the grid enables master-detail mode. In this case, each master row displays an expand button, which allows end-users to access the detail data. To hide the expand buttons, set the GridOptionsView.ShowDetailButtons property to false. If you need to disable master-detail mode in a Grid View regardless of the data source’s settings, you can use a master View’s GridOptionsDetail.EnableMasterViewMode property.
See Also