检测到TreeView项上的DragDrop [英] Detecting a DragDrop onto a TreeView item

问题描述

我正在从一个用户控件拖放到另一个TreeView。但是，如何检测到树状视图项目的下落？我可以检测到TreeView中是否有一个下拉列表，但是那不是该项目。我可以做一个TreeViewItem.Drop事件，但是那是当我将一个Item放到TreeView而不是从另一个控件中。

I am doing a drag drop from one user control onto a different TreeView. However, how can I detect the drop into the tree view item? I can detect if there is a drop into the TreeView, but thats not the item. I can do an TreeViewItem.Drop event, but thats for when I drop an Item inside the TreeView, not from another control.

我试图看到TreeView被聚焦，但是，这并没有解决。我可以在TreeView及其项目上检测到DragEnter / Leave，但无法检测到拖放。我看过其他主题，据说这些主题有一个DragOver可以解决此问题，但是那没用。

I tried seeing the TreeView to be focused, however, that did not solve it. I can detect DragEnter/Leave on the TreeView and it's Items, but not the drop. I have taken a look at other topics that said to have a DragOver to potentially fix this, hwever, but that did not work.

推荐答案

试试看：

    private void treeView1_DragDrop(object sender, DragEventArgs e)
    {
        Point DropXY = ((TreeView)sender).PointToClient(new Point(e.X, e.Y));
        TreeNode DestinationNode = ((TreeView)sender).GetNodeAt(DropXY);

        MessageBox.Show(DestinationNode.Text);
    }

注意：您必须具有的AllowDrop属性为TreeView设置为true。
而且，您必须处理此事件：

Note: You must have the AllowDrop property of the TreeView set to true. And, you must handle this event:

private void treeView1_DragOver(object sender, DragEventArgs e)
{
    e.Effect = DragDropEffects.Copy;
}

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