模拟鼠标按下

        [System.Runtime.InteropServices.DllImport("user32")]
        private static extern int mouse_event(int dwFlags, int dx, int dy, int cButtons, int dwExtraInfo);
        [System.Runtime.InteropServices.DllImport("user32")]
        private static extern bool SetCursorPos(int X, int Y);
        [System.Runtime.InteropServices.DllImport("user32")]
        private static extern bool GetCursorPos(out Point lpPoint);

        public enum MouseEventFlags
        {
            LEFTDOWNE = 0x00000002,
            LEFTUP = 0x00000004,
            MIDDLEDOWN = 0x00000020,
            MIDDLEUP = 0x00000040,
            MOVE = 0x00000001,
            ABSOLUTE = 0x00008000,
            RIGHTDOWN = 0x00000008,
            RIGHTUP = 0x00000010
        }
        /// <summary>
        /// 模拟鼠标按下
        /// </summary>
        /// <param name="lpPoint">鼠标按下的位置</param>
        public static void simulateDeviceMouseDown(Point lpPoint)
        {
            //先释放鼠标
            mouse_event((int)(MouseEventFlags.LEFTUP | MouseEventFlags.ABSOLUTE), 0, 0, 0, 0);
            //将鼠标移动到指定位置
            SetCursorPos(lpPoint.X + 5, lpPoint.Y + 5);
            //在模拟鼠标按下
            mouse_event((int)(MouseEventFlags.LEFTDOWNE | MouseEventFlags.ABSOLUTE), lpPoint.X, lpPoint.Y, 0, 0);
        }