TreeListView.CustomUnboundColumnData Event

Enables data to be supplied to unbound columns.

Namespace: DevExpress.Xpf.Grid

Assembly: DevExpress.Xpf.Grid.v14.2.dll

Declaration

C#

public event TreeListUnboundColumnDataEventHandler CustomUnboundColumnData

VB.NET

Public Event CustomUnboundColumnData As TreeListUnboundColumnDataEventHandler

Event Data

The CustomUnboundColumnData event's handler receives an argument of the TreeListUnboundColumnDataEventArgs type. The following properties provide information specific to this event:

Property	Description
Column	Gets the unbound column currently being processed. Inherited from ColumnDataEventArgsBase.
IsGetData	Gets whether you should provide data for the currently processed cell. Inherited from ColumnDataEventArgsBase.
IsSetData	Gets whether a cell's value should be saved to a data source. Inherited from ColumnDataEventArgsBase.
Node	Gets the node which contains the processed cell.
Value	Gets or sets the processed cell's value. Inherited from ColumnDataEventArgsBase.

Remarks

Unbound columns are not bound to any field in a data source. In most instances, data for unbound columns is obtained from a custom data source or is calculated based upon the values of bound columns. To provide data for unbound columns, and save any changes made back to a custom data source, handle the CustomUnboundColumnData event.

• Display Unbound Data

  The event parameter's ColumnDataEventArgsBase.IsGetData property returns true. The event is raised for each node, allowing the values of unbound columns to be specified. The processed node is returned by the TreeListUnboundColumnDataEventArgs.Node property. A value should be assigned to the ColumnDataEventArgsBase.Value property.

• Save Changes

  The event parameter's ColumnDataEventArgsBase.IsSetData property returns true. The ColumnDataEventArgsBase.Value property contains the modified cell value that should be saved to a custom data source.