#region API - 拖动无标题窗口及控件
///

       /// API - 数拖动无标题窗口及控件
       /// 用法：图片或者其他控件的mousedown事件中：
       ///      Win32.API_MouseDownDrag(this.Handle);
       ///

       ///

       [DllImport("user32")]
       private static extern bool ReleaseCapture();

       [DllImport("user32")]
       private static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);

       public const int WM_SYSCOMMAND = 0x0112;
       public const int SC_MOVE = 0Xf010;
       public const int HTCAPTION = 0x0002;

       public static void API_MouseDownDrag(IntPtr hwnd)
       {
           ReleaseCapture();
           SendMessage(hwnd, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
       }
        #endregion

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C# API-拖动无标题窗口及控件

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