DragDropBehaviorBase<TDragDropBehaviorSource, TDragDropBehaviorProperties>.DragDrop Event

Occurs when a data element is dropped on the control.

Namespace: DevExpress.Utils.DragDrop

Assembly: DevExpress.Utils.v24.1.dll

NuGet Packages: DevExpress.Utils, DevExpress.Wpf.Core

Declaration

C#

[DXCategory("DragDrop")]
public event DragDropEventHandler DragDrop

VB.NET

<DXCategory("DragDrop")>
Public Event DragDrop As DragDropEventHandler

Event Data

The DragDrop event's data class is DragDropEventArgs. The following properties provide information specific to this event:

Property	Description
Action	Gets or sets the drag-and-drop action (Copy, Move, etc.) to perform. Inherited from DXDragEventArgs.
Cursor	Gets or sets the mouse pointer. Inherited from DXDragEventArgs.
Data	Gets or sets the data elements being dragged. Inherited from DXDragEventArgs.
Handled	Gets or sets whether the event was handled and allows you to suppress the default action. Inherited from DXDefaultEventArgs.
InsertType	Gets or sets whether dragged data elements are inserted before or after a data element under the mouse pointer, or as a child (for tree list only). Inherited from DragOverEventArgsBase.
KeyState	Gets the pressed mouse buttons (left, middle, right) and modifier keys (Shift, Ctrl, Alt). Inherited from DXDragEventArgs.
Location	Gets the mouse cursor’s position. Inherited from DXDragEventArgs.
Source	Gets the source control. Inherited from DXDragEventArgs.
Tag	Gets or sets custom data associated with the drag-and-drop operation. Inherited from DragOverEventArgsBase.
Target	Gets the target control. Inherited from DXDragEventArgs.

The event data class exposes the following methods:

Method	Description
Default()	Invokes the default action the attached control performs on the current drag-and-drop operation stage. Inherited from DXDefaultEventArgs.
GetData<T>()	Returns the data elements being dragged. Inherited from DXDragEventArgs.

Remarks

If you attached the Drag-and-Drop Behavior to a control in the designer, use the DragDropEvents component to subscribe to the drag-and-drop events.

Example

The example below shows how to copy data from a tree list to a grid.

C#

using DevExpress.Utils.DragDrop;

//The code below assumes that you are moving data from a tree list to a grid.
//Create new grid rows, and populate them with data from tree list nodes.
private void dragDropEvents1_DragDrop(object sender, DragDropEventArgs e) {
    List<TreeListNode> list = e.Data as List<TreeListNode>;
    foreach (TreeListNode node in list) {
        gridView1.AddNewRow();
        gridView1.SetRowCellValue(GridControl.NewItemRowHandle, gridView1.Columns["DEPARTMENT"], node.GetValue(colDEPARTMENT1));
    }
    e.Handled = true;
}

VB.NET

Imports DevExpress.Utils.DragDrop

'The code below assumes that you are moving data from a tree list to a grid.
'Create new grid rows, and populate them with data from tree list nodes.
Private Sub dragDropEvents1_DragDrop(ByVal sender As Object, ByVal e As DevExpress.Utils.DragDrop.DragDropEventArgs) _
    Handles dragDropEvents1.DragDrop
    Dim list As List(Of TreeListNode) = TryCast(e.Data, List(Of TreeListNode))
    For Each node As TreeListNode In list
        gridView1.AddNewRow()
        gridView1.SetRowCellValue(GridControl.NewItemRowHandle, gridView1.Columns("DEPARTMENT"), node.GetValue(colDEPARTMENT1))
    Next node
    e.Handled = True
End Sub

Note

When you handle the DragDrop event for a grid view, use the static (Shared in VB) DragDropGridEventArgs.GetDragDropGridEventArgs method to calculate arguments specific to the grid view.

C#

using DevExpress.Utils.DragDrop;
using DevExpress.XtraGrid.Views.Grid;

dragDropEvents1.DragDrop += Behavior_DragDrop;

private void Behavior_DragDrop(object sender, DragDropEventArgs e) {
   DragDropGridEventArgs args = DragDropGridEventArgs.GetDragDropGridEventArgs(e);
   //You can also cast DragDropEventArgs to DragDropGridEventArgs.
   //DragDropGridEventArgs args = (DragDropGridEventArgs)e;
}

VB.NET

Imports DevExpress.Utils.DragDrop
Imports DevExpress.XtraGrid.Views.Grid

AddHandler DragDropEvents1.DragDrop, AddressOf Behavior_DragDrop
Private Sub Behavior_DragDrop(ByVal sender As Object, ByVal e As DragDropEventArgs)
   Dim args As DragDropGridEventArgs = DragDropGridEventArgs.GetDragDropGridEventArgs(e)
   'You can also cast DragDropEventArgs to DragDropGridEventArgs.
   'Dim args As DragDropGridEventArgs = CType(e, DragDropGridEventArgs)
End Sub

Note

Run the XtraTreeList or XtraGrid demo and click Open Solution for more examples.