C#中treeView内容拖动效果功能的实现

窗体如下：

代码如下：

treeView相关事件代码：

private void treeView1_ItemDrag(object sender, ItemDragEventArgs e)
        {
            TreeNode dragNode = e.Item as TreeNode;
            this.treeView1.SelectedNode = dragNode;
            this.imageListDrag.Images.Clear();
            imageListDrag.ImageSize = new Size(dragNode.Bounds.Size.Width + this.treeView1.Indent, dragNode.Bounds.Height);

            Bitmap bmp = new Bitmap(dragNode.Bounds.Width + this.treeView1.Indent, dragNode.Bounds.Height);
            Graphics gfx = Graphics.FromImage(bmp);
            gfx.DrawString(dragNode.Text, this.treeView1.Font, new SolidBrush(this.treeView1.ForeColor), (float)this.treeView1.Indent, 1.0f);
            imageListDrag.Images.Add(bmp);
            Point p = this.treeView1.PointToClient(Control.MousePosition);

            int dx = p.X + this.treeView1.Indent - dragNode.Bounds.Left;
            int dy = p.Y - dragNode.Bounds.Top;
            if (DragHelper.ImageList_BeginDrag(imageListDrag.Handle, 0, dx, dy))
            {
                this.treeView1.DoDragDrop(dragNode, DragDropEffects.Move);
                DragHelper.ImageList_EndDrag();
            }

        }
        private void treeView1_DragEnter(object sender, DragEventArgs e)
        {
            DragHelper.ImageList_DragEnter(this.treeView1.Handle, e.X - this.treeView1.Left, e.Y - this.treeView1.Top);
        }
        private void treeView1_DragLeave(object sender, EventArgs e)
        {
            DragHelper.ImageList_DragLeave(this.treeView1.Handle);
        }
        private void treeView1_DragOver(object sender, DragEventArgs e)
        {
            try
            {
                Point formP = this.PointToClient(new Point(e.X, e.Y));
                DragHelper.ImageList_DragMove(formP.X - this.treeView1.Left, formP.Y - this.treeView1.Top);
                e.Effect = DragDropEffects.Move;
                this.treeView1.Cursor = Cursors.Hand;
            }
            catch (Exception ex)
            {
                string name = ex.ToString();
            }
        }

listBox2 相关事件代码：

private void listBox2_DragDrop(object sender, DragEventArgs e)
        {
            TreeNode tn = (TreeNode)e.Data.GetData(typeof(TreeNode));
            this.listBox2.Items.Add(tn.Text);

            this.listBox2.Items.Add(e.Data.GetData(tn.Level.ToString()));
        }
        private void listBox2_DragEnter(object sender, DragEventArgs e)
        {
            try
            {
                if (e.Data.GetDataPresent(typeof(TreeNode)))
                {
                    DragHelper.ImageList_DragEnter(this.Handle, e.X , e.Y );
                    e.Effect = DragDropEffects.Move;
                }
                else
                    e.Effect = DragDropEffects.None;
                this.listBox2.Cursor = Cursors.Hand;
            }
            catch (Exception ex)
            {
                string name = ex.ToString();
            }

        }
        private void listBox2_DragOver(object sender, DragEventArgs e)
        {
            try
            {
                System.Drawing.Point formP = this.PointToClient(new System.Drawing.Point(e.X, e.Y));
                DragHelper.ImageList_DragMove(formP.X , formP.Y);
                this.listBox2.Cursor = Cursors.Hand;
            }
            catch (Exception ex)
            {
                string name = ex.ToString();
            }
        }

拖动后的效果图：