C#启动屏保

代码如下

using System.Runtime.InteropServices; 

        [DllImport("user32.dll")]
        private static extern int SendMessageA(int hWnd, int Msg, int wParam, int lParam);

        private const int HWND_BROADCAST = 0xffff;
        private const int WM_SYSCOMMAND = 0x112;
        private const int SC_SCREENSAVE = 0xf140;

        public void  screenSaveStart()
        {
                       SendMessageA(HWND_BROADCAST, WM_SYSCOMMAND, SC_SCREENSAVE, 0);
        }