winform 两个TreeView间拖拽节点

/// <summary>
/// 正在拖拽的节点
/// </summary>
private TreeNode DragNode = null;
/// <summary>
/// 节点来源
/// </summary>
private TreeView NodeSource = null;
/// <summary>
/// 树形节点移动方向
/// </summary>
private MoveTreeView MoveTo = MoveTreeView.NoMove; /// <summary>
/// 当鼠标拖拽某相进入控件区域内时
/// </summary>
private void TreeView_DragEnter(object sender, DragEventArgs e)
{
e.Effect = DragDropEffects.Move;
} /// <summary>
/// 当鼠标拖拽某节点时（两个控件的该事件都指向这个方法）
/// </summary>
private void TreeView_ItemDrag(object sender, ItemDragEventArgs e)
{
if (e.Item is TreeNode && e.Button == System.Windows.Forms.MouseButtons.Left &&
e.Item != null && sender is TreeView)
{
TreeView trv = sender as TreeView;
TreeNode node = e.Item as TreeNode;
if (node.Parent != null && trv.Tag != null)
{
int value = Convert.ToInt32(trv.Tag);
MoveTo = (MoveTreeView)value;
DragNode = node;
NodeSource = trv;
trv.DoDragDrop(node, DragDropEffects.Move);
}
}
} /// <summary>
/// 拖拽完成时发生的事件（两个控件的该事件都指向这个方法）
/// </summary>
private void TreeView_DragDrop(object sender, DragEventArgs e)
{
if (sender != null && sender is TreeView)
{
TreeView trv = sender as TreeView;
if (trv.Tag != null)
{
MoveTreeView move = (MoveTreeView)Convert.ToInt32(trv.Tag);
if (move == MoveTo) { DragNode = null; NodeSource = null; }
else
{
Point p = trv.PointToClient(new Point(e.X, e.Y));
TreeNode node = trv.GetNodeAt(p);
string path = GetClientPath(DragNode, DragNode.Text);
NodeSource.Nodes.Remove(DragNode);
node.Nodes.Add(DragNode);
}
}
}
} /// <summary>
/// 属性节点移动方向
/// </summary>
public enum MoveTreeView
{
/// <summary>
/// 未移动
/// </summary>
NoMove = -,
/// <summary>
/// 上传（客户端拖拽到服务器端）
/// </summary>
ClientToServer = ,
/// <summary>
/// 下载（服务器端拖拽到客户端）
/// </summary>
ServerToClient =
}