#region tree拖拽操作        TreeListHitInfo downHitInfo = null;        #region 拖出        private void treeList1_MouseMove(object sender, MouseEventArgs e)        {            TreeList treelist = sender as TreeList;            if (e.Button == MouseButtons.Left && downHitInfo != null)            {                if (treeList1.Selection.Count == 0)                    return;                Size dragSize = SystemInformation.DragSize;                Rectangle dragRect = new Rectangle(new Point(downHitInfo.MousePoint.X - dragSize.Width / 2,                    downHitInfo.MousePoint.Y - dragSize.Height / 2), dragSize);                if (!dragRect.Contains(new Point(e.X, e.Y)))                {                    List<TreeListNode> node = new List<TreeListNode>();                    foreach (TreeListNode n in treeList1.Selection)                    {                        node.Add(n);                    }                    treelist.DoDragDrop(downHitInfo.Node, DragDropEffects.Move);                    downHitInfo = null;                    DevExpress.Utils.DXMouseEventArgs.GetMouseArgs(e).Handled = true;                }            }                    }        private void treeList1_MouseDown(object sender, MouseEventArgs e)        {            TreeList treelist = sender as TreeList;            downHitInfo = null;            TreeListHitInfo hitInfo = treelist.CalcHitInfo(new Point(e.X, e.Y));            if (Control.ModifierKeys != Keys.None) return;            if (e.Button == MouseButtons.Left)            {                downHitInfo = hitInfo;            }        }        #endregion        #region 拖入        private void treeList2_DragOver(object sender, DragEventArgs e)        {            TreeList treelist = sender as TreeList;            if (treelist != null)            {                e.Effect = DragDropEffects.Move;            }        }        private void treeList2_DragEnter(object sender, DragEventArgs e)        {            e.Effect = DragDropEffects.Move;        }        private void treeList2_DragDrop(object sender, DragEventArgs e)        {            List<TreeListNode> nodes = e.Data.GetData(typeof(List<TreeListNode>)) as List<TreeListNode>;            TreeList grid = sender as TreeList;            DataTable table = grid.DataSource as DataTable;            if (nodes != null && nodes.Count > 0 && table != null)            {                foreach (TreeListNode node in nodes)                {                    treeList1.Nodes.Add(node);                }            }        }        #endregion        #endregion