在面板中拖放 TableLayoutPanel？

Question

我正在尝试使用 winforms/c# 在面板中拖放 tablelayoutpanel，tablelayout 的拖动成功，但问题是 tablelayoutpanel 没有出现！ 请问有什么解决办法吗？？

private void Registration_Load(object sender, EventArgs e)
{   
     panel2.AllowDrop = true;
     tableLayoutPanel1.AllowDrop = true;
     panel2.DragEnter += panel2_DragEnter;   
     panel2.DragDrop += panel2_DragDrop;
     tableLayoutPanel1.MouseDown += tableLayoutPanel1_MouseDown;
}   

private void panel2_DragEnter(object sender, DragEventArgs e)
{
    e.Effect = DragDropEffects.Move;
}

private void panel2_DragDrop(object sender, DragEventArgs e)
{
     ((TableLayoutPanel)e.Data.GetData(typeof(TableLayoutPanel))).Parent (Panel)sender;                
}
private void tableLayoutPanel1_MouseDown(object sender, MouseEventArgs e)
{
     tableLayoutPanel1.DoDragDrop(tableLayoutPanel1, DragDropEffects.Move);
}

Answer 1

代码不充分，您至少需要设置放置的 TLP 的 Location 属性，以确保它在面板边界内和/或位于鼠标光标处。并且 Z 顺序很重要，设置 Parent 属性将其置于底部以便它可以很容易地与面板中的其他控件重叠，您需要 BringToFront()。

试试这个：

    private void panel2_DragEnter(object sender, DragEventArgs e) {
        if (e.Data.GetDataPresent(typeof(TableLayoutPanel))) e.Effect = DragDropEffects.Move;
    }

    private void panel2_DragDrop(object sender, DragEventArgs e) {
        var tlp = (TableLayoutPanel)e.Data.GetData(typeof(TableLayoutPanel));
        tlp.Location = panel2.PointToClient(new Point(e.X, e.Y));
        tlp.Parent = panel2;
        tlp.BringToFront();
    }