.NET/C# 阻止屏幕关闭，阻止系统进入睡眠状态

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/// <summary> /// Enables an application to inform the system that it is in use, thereby preventing the system from entering sleep or turning off the display while the application is running. /// </summary> DllImport("kernel32") private static extern ExecutionState SetThreadExecutionState(ExecutionState esFlags);

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Flags private enum ExecutionState : uint { /// <summary> /// Forces the system to be in the working state by resetting the system idle timer. /// </summary> SystemRequired = 0x01, /// <summary> /// Forces the display to be on by resetting the display idle timer. /// </summary> DisplayRequired = 0x02, /// <summary> /// This value is not supported. If <see cref="UserPresent"/> is combined with other esFlags values, the call will fail and none of the specified states will be set. /// </summary> Obsolete("This value is not supported.") UserPresent = 0x04, /// <summary> /// Enables away mode. This value must be specified with <see cref="Continuous"/>. /// <para /> /// Away mode should be used only by media-recording and media-distribution applications that must perform critical background processing on desktop computers while the computer appears to be sleeping. /// </summary> AwaymodeRequired = 0x40, /// <summary> /// Informs the system that the state being set should remain in effect until the next call that uses <see cref="Continuous"/> and one of the other state flags is cleared. /// </summary> Continuous = 0x80000000, }

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using System; using System.Runtime.InteropServices; namespace Walterlv.Windows { /// <summary> /// 包含控制屏幕关闭以及系统休眠相关的方法。 /// </summary> public static class SystemSleep { /// <summary> /// 设置此线程此时开始一直将处于运行状态，此时计算机不应该进入睡眠状态。 /// 此线程退出后，设置将失效。 /// 如果需要恢复，请调用 <see cref="RestoreForCurrentThread"/> 方法。 /// </summary> /// <param name="keepDisplayOn"> /// 表示是否应该同时保持屏幕不关闭。 /// 对于游戏、视频和演示相关的任务需要保持屏幕不关闭；而对于后台服务、下载和监控等任务则不需要。 /// </param> public static void PreventForCurrentThread(bool keepDisplayOn = true) { SetThreadExecutionState(keepDisplayOn ? ExecutionState.Continuous | ExecutionState.SystemRequired | ExecutionState.DisplayRequired : ExecutionState.Continuous | ExecutionState.SystemRequired); } /// <summary> /// 恢复此线程的运行状态，操作系统现在可以正常进入睡眠状态和关闭屏幕。 /// </summary> public static void RestoreForCurrentThread() { SetThreadExecutionState(ExecutionState.Continuous); } /// <summary> /// 重置系统睡眠或者关闭屏幕的计时器，这样系统睡眠或者屏幕能够继续持续工作设定的超时时间。 /// </summary> /// <param name="keepDisplayOn"> /// 表示是否应该同时保持屏幕不关闭。 /// 对于游戏、视频和演示相关的任务需要保持屏幕不关闭；而对于后台服务、下载和监控等任务则不需要。 /// </param> public static void ResetIdle(bool keepDisplayOn = true) { SetThreadExecutionState(keepDisplayOn ? ExecutionState.SystemRequired | ExecutionState.DisplayRequired : ExecutionState.SystemRequired); } } }

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// 阻止系统睡眠，阻止屏幕关闭。 SystemSleep.PreventForCurrentThread(); // 恢复此线程曾经阻止的系统休眠和屏幕关闭。 SystemSleep.RestoreForCurrentThread();

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// 重置系统计时器，临时性阻止系统睡眠和屏幕关闭。 // 此效果类似于手动使用鼠标或键盘控制了一下电脑。 SystemSleep.ResetIdle();