完整代码：

[DllImport("user32")]  private static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, IntPtr lParam);  private const int WM_SETREDRAW = 0xB;   //禁止pnl重绘  //SendMessage(SelfInfo_pnlContact1.Handle, WM_SETREDRAW, 0, IntPtr.Zero);  //允许重绘pnl  //SendMessage(SelfInfo_pnlContact1.Handle, WM_SETREDRAW, 1, IntPtr.Zero);    参数是控件

 参考：