C#阻止系统休眠

using System.Runtime.InteropServices;

static class WinSleepCtr
{
    //定义API函数
    [DllImport("kernel32.dll")]
    static extern uint SetThreadExecutionState(uint esFlags);
    const uint ES_SYSTEM_REQUIRED = 0x00000001;
    const uint ES_DISPLAY_REQUIRED = 0x00000002;
    const uint ES_CONTINUOUS = 0x80000000;

    public static void SleepCtr(bool sleepOrNot)
    {
        if (sleepOrNot)
        {
            //阻止休眠时调用
            SetThreadExecutionState(ES_CONTINUOUS | ES_DISPLAY_REQUIRED | ES_SYSTEM_REQUIRED);
        }
        else
        {
            //恢复休眠时调用
            SetThreadExecutionState(ES_CONTINUOUS);
        }
    }
}