c#可以在窗口的任一位置拖动窗口方法

private void myForm_MouseDown(object sender, MouseEventArgs e)//在窗体的任一位置按下鼠标左键（不被控件所覆盖的区域）可拖动窗口
        {
            ReleaseCapture();                                           //API函数 
            PostMessage((int)this.Handle, WM_SysCommand, OneMsgNum, 0); //API函数
        }        #region API函数
        private const int WM_SysCommand = 0x0112;
        private const int OneMsgNum = 0xf017;
        //---------------------------------------
        //以下两个API函数的作用：拖动窗口
        [DllImport("user32")]
        private static extern bool ReleaseCapture();
        [DllImport("user32")]
        private static extern bool PostMessage(int hWnd, int Mwg, int wParam, int lParam);
        //---------------------------------------
        #endregion