DevExpress WinForm GridControl 实现拖动多行到TreeView

参考文章：Drag-and-drop of multiple selected grid rows

如果列表有使用行内编辑功能，需要将列表的 OptionsBehavior.EditorShowMode 属性设置为 MouseUp 或者 Click

　　　　        private GridHitInfo downHitInfo = null;　　　　 private void myView_MouseDown(object sender, MouseEventArgs e)
        {
            GridView view = sender as GridView;
            downHitInfo = null;
            if (view != null)
            {
                GridHitInfo hitInfo = view.CalcHitInfo(new Point(e.X, e.Y));
                if (e.Button == MouseButtons.Left && hitInfo.InRow && hitInfo.HitTest != GridHitTest.RowIndicator)
                {
                    downHitInfo = hitInfo;
                }
            }
        }

        private void myView_MouseMove(object sender, MouseEventArgs e)
        {
            GridView view = sender as GridView;
            if (e.Button == MouseButtons.Left && downHitInfo != null)
            {
                Size dragSize = SystemInformation.DragSize;
                Rectangle dragRect = new Rectangle(new Point(downHitInfo.HitPoint.X - dragSize.Width/2,downHitInfo.HitPoint.Y - dragSize.Height/2), dragSize);

                if (!dragRect.Contains(new Point(e.X, e.Y)))
                {
                    if (view != null)
                    {
                        List<MyClass> myList = view.GetSelectedRows().Select(rownum => view.GetRow(rownum) as MyClass).ToList();
                        view.GridControl.DoDragDrop(myList, DragDropEffects.Move);
                    }
                    downHitInfo = null;
                    DevExpress.Utils.DXMouseEventArgs.GetMouseArgs(e).Handled = true;
                }
            }
        }

        private void myTreeView_DragOver(object sender, DragEventArgs e)
        {
            e.Effect = e.Data.GetDataPresent(typeof(List<MyClass>)) ? DragDropEffects.Move : DragDropEffects.None;
        }

        private void myTreeView_DragDrop(object sender, DragEventArgs e)
        {
            List<MyClass> modelData = (List<MyClass>)e.Data.GetData(typeof(List<MyClass>));
            TreeNode dropNode = this.myTreeView.GetNodeAt(myTreeView.PointToClient(new Point(e.X, e.Y)));
            //这里写拖动后想要执行的操作
        }