Control::DragDrop Event

 
System_CAPS_noteNote

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Occurs when a drag-and-drop operation is completed.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public:
event DragEventHandler^ DragDrop {
	void add(DragEventHandler^ value);
	void remove(DragEventHandler^ value);
}

The X and Y properties of the DragEventArgs are in screen coordinates, not client coordinates. The following line of Visual C# code converts the properties to a client Point.

Point clientPoint = targetControl.PointToClient(new Point(de.X, de.Y));
System_CAPS_noteNote

In versions earlier than .NET Framework 2.0, if you put a UserControl with DragEnter and DragDrop events on a Windows Form and drag and drop something onto the UserControl at design time, the DropDrop and DropEnter events are raised. However, when you close and reopen the solution, the DragEnter and DragDrop events are not raised again.

For more information about handling events, see Handling and Raising Events.

This code excerpt demonstrates using the DragDrop event. See the DoDragDrop method for the complete code example.

void ListDragTarget_DragDrop( Object^ /*sender*/, System::Windows::Forms::DragEventArgs^ e )
{
   // Ensure that the list item index is contained in the data.
   if ( e->Data->GetDataPresent( System::String::typeid ) )
   {
      Object^ item = dynamic_cast<Object^>(e->Data->GetData( System::String::typeid ));

      // Perform drag-and-drop, depending upon the effect.
      if ( e->Effect == DragDropEffects::Copy || e->Effect == DragDropEffects::Move )
      {
         // Insert the item.
         if ( indexOfItemUnderMouseToDrop != ListBox::NoMatches )
                        ListDragTarget->Items->Insert( indexOfItemUnderMouseToDrop, item );
         else
                        ListDragTarget->Items->Add( item );
      }
   }

   // Reset the label text.
   DropLocationLabel->Text = "None";
}

.NET Framework
Available since 1.1
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