ListView拖动到TreeView

[josxhn]

TreeView向TreeView拖动我会做。
TreeView向ListView拖动的资料也找到了

可是ListView向TreeView拖动就做不出来，
分别设置了ListView.AllowDrop和TreeView.AllowDrop为True
并且设置了ListView.ItemDrag事件和TreeView.DragEnter和TreeView.DrapDrop

但选中listView中项目拖动到TreeView区域后，鼠标指针就变成圆圈里面一个斜杠的图标，请问问题在哪里

        //lvwBrowser是ListView, tvwCatalog是TreeView

        //从lvwBrowser发起的拖动
        private void lvwBrowser_ItemDrag(object sender , ItemDragEventArgs e)
        {
            //判断是否是鼠标右键按动
            if (e.Button == MouseButtons.Right)
            {
                MessageBox.Show("e.Button == MouseButtons.Right");
                return;
            }
            //判断组件中是否存在项目
            if (lvwBrowser.SelectedItems.Count <= 0)
            {
                MessageBox.Show("lvwBrowser.SelectedItems.Count<=0");
                return;
            }

            IList<ListViewItem> dragItemList = new List<ListViewItem>();
            foreach (ListViewItem lvi in lvwBrowser.SelectedItems)
            {
                dragItemList.Add(lvi);
            }

            //对组件中的字符串开始拖放操作
            lvwBrowser.DoDragDrop(dragItemList , DragDropEffects.Copy | DragDropEffects.Move);
        }      
    

        //从tvwCatalog发起的拖动
        private void tvwCatalog_ItemDrag(object sender , ItemDragEventArgs e)
        {
            DoDragDrop(e.Item , DragDropEffects.Move);
        }

        //对拖动到tvwCatalog树节点的数据类型的检查
        private void tvwCatalog_DragEnter(object sender , DragEventArgs e)
        {
            if (e.Data.GetDataPresent(typeof(TreeNode)) || e.Data.GetDataPresent(typeof(IList<ListViewItem>)))
                e.Effect = DragDropEffects.Move;
            else
                e.Effect = DragDropEffects.None;
        }

        //拖动到tvwCatalog树节点的事件的处理，检查数据类型区分拖动事件来自lvwBrowser还是tvwCatalog
        private void tvwCatalog_DragDrop(object sender , DragEventArgs e)
        {
            //来自tvwCatalog的拖动事件
            if (e.Data.GetDataPresent(typeof(TreeNode)))
            {
                //获取被拖动树节点数据
                TreeNode dragNode = (TreeNode) (e.Data.GetData(typeof(TreeNode)));

                Position.X = e.X;
                Position.Y = e.Y;
                Position = tvwCatalog.PointToClient(Position);
                //获取拖动目标树节点
                TreeNode dropNode = this.tvwCatalog.GetNodeAt(Position);
                //执行数据处理
                CatalogBehaviors cb = new CatalogBehaviors(dragNode , dropNode , null);
                cb.DragNodes();
            }

            //来自lvwBrowser的拖动事件
            if (e.Data.GetDataPresent(typeof(IList<ListViewItem>)))
            {
                //获取拖动起始树节点
                TreeNode dragNode = (TreeNode)(lvwBrowser.Tag);
                //获取被拖动列表项目数据
                IList<ListViewItem> dragItemList = (IList<ListViewItem>) (e.Data.GetData(typeof(IList<ListViewItem>)));

                Position.X = e.X;
                Position.Y = e.Y;
                Position = tvwCatalog.PointToClient(Position);
                //获取拖动目标树节点
                TreeNode dropNode = this.tvwCatalog.GetNodeAt(Position);
                //执行数据处理
                CatalogBehaviors cb = new CatalogBehaviors(dragNode,dropNode,dragItemList);
                cb.DragItems();
            }
        }

[artoriar]

//对拖动到tvwCatalog树节点的数据类型的检查
private void tvwCatalog_DragEnter(object sender , DragEventArgs e)
{
//改成List<ListViewItem>
if (e.Data.GetDataPresent(typeof(TreeNode)) || e.Data.GetDataPresent(typeof(IList<ListViewItem>)))
e.Effect = DragDropEffects.Move;
else
e.Effect = DragDropEffects.None;
}

[Stella_Xu]

楼主能不能把代码传给我一份呢？我不知道为什么就是实现不了呢！

[Stella_Xu]

忘记说了，我的邮箱[e-mail]，非常感谢！

[josxhn]

[Quote=引用 3 楼 stella_xu 的回复:]

忘记说了，我的邮箱[e-mail]，非常感谢！
[/Quote]

//Drag informations from browser
private void lvwBrowser_ItemDrag_1(object sender , ItemDragEventArgs e)
{
	//判断是否是鼠标右键按动
	if (e.Button == MouseButtons.Right)
	{
		MessageBox.Show("e.Button == MouseButtons.Right");
		return;
	}
	//判断控件中是否存在项目
	if (lvwBrowser.SelectedItems.Count <= 0)
	{
		MessageBox.Show("lvwBrowser.SelectedItems.Count<=0");
		return;
	}

	IList<ListViewItem> dragItemList = new List<ListViewItem>();
	foreach (ListViewItem lvi in lvwBrowser.SelectedItems)
	{
		dragItemList.Add(lvi);
	}

	//对控件中的项目集合开始拖放操作
	lvwBrowser.DoDragDrop(dragItemList , DragDropEffects.Move);
}

//Drag a directory from catalog
private void tvwCatalog_ItemDrag_1(object sender , ItemDragEventArgs e)
{
	DoDragDrop(e.Item , DragDropEffects.Move);
}

//Check type of data draged
private void tvwCatalog_DragEnter_1(object sender , DragEventArgs e)
{
	if (e.Data.GetDataPresent(typeof(TreeNode)) || e.Data.GetDataPresent(typeof(List<ListViewItem>)))
		e.Effect = DragDropEffects.Move;
	else
	{
		e.Effect = DragDropEffects.None;
	}

}

//Drop a directory or informations into another directory
private void tvwCatalog_DragDrop_1(object sender , DragEventArgs e)
{
	//来自tvwCatalog的拖动事件
	if (e.Data.GetDataPresent(typeof(TreeNode)))
	{
		//获取被拖动树节点数据
		TreeNode dragNode = (TreeNode) (e.Data.GetData(typeof(TreeNode)));
		Position.X = e.X;
		Position.Y = e.Y;
		Position = tvwCatalog.PointToClient(Position);
		//获取拖动目标树节点
		TreeNode dropNode = this.tvwCatalog.GetNodeAt(Position);
		//禁止拖动到自身
		if (dragNode == dropNode)
		{
			MessageBox.Show("Cannot move a directory to itself." , "Notify");
			return;
		}
		//执行UI处理
		DragNode(dragNode , dropNode);
		//执行数据处理
		LINQDAL.MoveDirectory(dragNode.Name , dropNode.Name);
		UpdateNode(dropNode);
		UpdateBrowser(dropNode);
	}

	//来自lvwBrowser的拖动事件
	if (e.Data.GetDataPresent(typeof(List<ListViewItem>)))
	{
		//获取拖动起始树节点
		TreeNode dragNode = (TreeNode) (lvwBrowser.Tag);
		//获取被拖动列表项目数据
		IList<ListViewItem> dragItemList = (IList<ListViewItem>) (e.Data.GetData(typeof(List<ListViewItem>)));
		Position.X = e.X;
		Position.Y = e.Y;
		Position = tvwCatalog.PointToClient(Position);
		//获取拖动目标树节点
		TreeNode dropNode = this.tvwCatalog.GetNodeAt(Position);
		//执行UI处理
		DragItems(dragNode , dropNode , dragItemList);
		//执行数据处理
		IList<string> infoIds = new List<string>();
		string dirId = dropNode.Name;
		foreach (ListViewItem lvi in dragItemList)
			infoIds.Add(lvi.SubItems[2].Text);
		//执行数据处理
		LINQDAL.MoveInformation(infoIds , dirId);
		UpdateNode(dropNode);
		UpdateBrowser(dropNode);
	}
}