我的程序运行时防止窗口进入睡眠状态？

using System;
using System.Runtime.InteropServices;

public class PowerManagement
{
    [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern EXECUTION_STATE SetThreadExecutionState(EXECUTION_STATE esFlags);

    [Flags]
    public enum EXECUTION_STATE : uint
    {
        ES_AWAYMODE_REQUIRED = 0x00000040,
        ES_CONTINUOUS = 0x80000000,
        ES_DISPLAY_REQUIRED = 0x00000002,
        ES_SYSTEM_REQUIRED = 0x00000001
    }
}

PowerManagement.SetThreadExecutionState(PowerManagement.EXECUTION_STATE.ES_CONTINUOUS | PowerManagement.EXECUTION_STATE.ES_SYSTEM_REQUIRED);

using System;
using System.Runtime.InteropServices;

public class PowerManagement
{
    [DllImport("powrprof.dll", CharSet = CharSet.Auto)]
    public static extern uint PowerSetRequest(PowerRequestType RequestType, IntPtr Request, IntPtr RequestId);

    public enum PowerRequestType
    {
        PowerRequestDisplayRequired = 0,
        PowerRequestSystemRequired = 1,
        PowerRequestAwayModeRequired = 2,
        PowerRequestExecutionRequired = 3
    }

    public struct PowerRequest
    {
        public IntPtr PowerRequestContext;
        public bool Enabled;
    }
}

PowerManagement.PowerRequest request = new PowerManagement.PowerRequest();
request.PowerRequestContext = IntPtr.Zero;
request.Enabled = true;

IntPtr requestPtr = Marshal.AllocHGlobal(Marshal.SizeOf(request));
Marshal.StructureToPtr(request, requestPtr, false);

PowerManagement.PowerSetRequest(PowerManagement.PowerRequestType.PowerRequestSystemRequired, requestPtr, IntPtr.Zero);

Marshal.FreeHGlobal(requestPtr);