Silverlight4.0 TreeViewItem拖放

问题描述

大家好，
我有一个问题如何取消阻力".

就我而言.当客户将treeViewItem拖动到目标时，显示messageBox，如果单击取消"按钮，则放弃拖动操作.

遵循是我的代码，但没有用.请帮忙！

XAML:

Hi All,
I have a question ''how to cancel drag.''

In my case. when customer drag treeViewItem to target, show messageBox, if ''Cancel'' button click, give up drag operation.

Follow is my code, but it dose not work.pls help!

XAML:

   <my:TreeViewDragDropTarget x:Name="tvddtCategroy" AllowDrop="true" AllowedSourceEffects="Move" ItemDroppedOnTarget="tvddtCategroy_ItemDroppedOnTarget">
      <controls:TreeView x:Name="tvCategory" BorderBrush="White" AllowDrop="True" 

      </controls:TreeView>
</my:TreeViewDragDropTarget>

C#:

C#:

private void tvddtCategroy_ItemDroppedOnTarget(object sender, ItemDragEventArgs e)
        {
            if (MessageBox.Show("Are you sure to move this category?", "", MessageBoxButton.OKCancel) == MessageBoxResult.Cancel)
            {
                e.Cancel = true;
                e.Handled = true;
            }
        }

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