C#通过热键控制显示器开关的方法

                        case 100:
                            MonitorHelper.TurnOn();
                            break;
                        case 101:
                            MonitorHelper.TurnOff();
                            break;
                    }
                    break;
            }
            base.WndProc(ref    m);
        }

        class MonitorHelper
        {
            public static void TurnOn()
            {
                SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, -1);
            }

            public static void TurnOff()
            {
                SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, 2);
            }

            [DllImport("user32.dll")]
            public static extern int SendMessage(IntPtr hWnd, uint Msg, int wParam, int lParam);

            private static readonly IntPtr HWND_BROADCAST = new IntPtr(0xffff);