实现方式有两种。

  方式一：通过重载事件来进行的

     参考项目源码：

     优点：调用到自己的项目中方式简单。随意拖动

     缺点：难以添加限制对于一些节点不能拖动的设置性弱

  方式二：通过写Treeview的事件来进行拖动

     前台：

    后台：

private Point _lastMouseDown;        private void tvRequire_MouseDown(object sender, MouseButtonEventArgs e)        {            if (e.ChangedButton == MouseButton.Left)            {                _lastMouseDown = e.GetPosition(tvRequire);            }        } private void tvRequire_MouseMove(object sender, MouseEventArgs e)        {            if (e.LeftButton == MouseButtonState.Pressed)            {                Point currentPosition = e.GetPosition(tvRequire);                if ((Math.Abs(currentPosition.X - _lastMouseDown.X) > 2.0) || (Math.Abs(currentPosition.Y - _lastMouseDown.Y) > 2.0))                {                    if ((tvRequire.SelectedItem as TreeViewItem) != null)                    {                        DragDropEffects finalDropEffect = DragDrop.DoDragDrop(tvRequire.SelectedItem as TreeViewItem, sender, DragDropEffects.Move);                    }                }            }        }private void TheTreeView_CheckDropTarget(object sender, DragEventArgs e)        {                        if (e.Source as TreeViewItem != null)            {                if (!IsValidDropTarget((e.Source as TreeViewItem).Tag))                {                    e.Effects = DragDropEffects.None;                }            }            e.Handled = true;        }//检查是否能够拖        private bool IsValidDropTarget(object id)        {            bool res = false;            if (id != null)            {                                //根据各自需求来写            }            return res;        }  //Drop 进行保存 private void tvRequire_Drop(object sender, DragEventArgs e)        {            TreeViewItem treeViewItemParent = new TreeViewItem();            if (e.Source as EditableTextBlock != null)            {                treeViewItemParent = (e.Source as EditableTextBlock).Parent as TreeViewItem;//().Parent as TreeViewItem                if (tvRequire.SelectedItem as TreeViewItem == (e.Source as EditableTextBlock).Parent as TreeViewItem)                {                    return;                }            }            else            {                treeViewItemParent = e.Source as TreeViewItem;                if (tvRequire.SelectedItem as TreeViewItem == e.Source as TreeViewItem)                {                    return;                }            }            //进行增加删除功能            TreeViewItem itemRemoved = tvRequire.SelectedItem as TreeViewItem;            CusRequireInfo cusRequireInfo = BLLCusRequire.GetModel(Convert.ToInt32(itemRemoved.Tag));            if (cusRequireInfo.ParentId == 0)            {                tvRequire.Items.Remove(itemRemoved);            }            else            {                (itemRemoved.Parent as TreeViewItem).Items.Remove(itemRemoved);            }            (treeViewItemParent).Items.Add(itemRemoved);            cusRequireInfo.ParentId = Convert.ToInt32(treeViewItemParent.Tag);            BLLCusRequire.Update(cusRequireInfo);        }

   PS:主要有三个方法体  tvRequire_MouseDown(开始记录坐标) tvRequire_MouseMove(指定拖动效果操作)TheTreeView_CheckDropTarget(用来检查是否可拖动)  tvRequire_Drop  （用来进行拖动后的保存）

       优点：能够自定义的限制拖拽条件，比较容易理解

       缺点：代码量多，复用率低

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