我需要禁用connected standby模式，直到桌面应用程序完成。所需的行为应该类似于我通过远程桌面连接到该计算机时发生的情况。也就是说，屏幕关闭，但系统在我断开连接之前不会进入睡眠状态。
是否有任何文档化或非文档化的方法可以让我的应用程序获得相同的行为？
我尝试了PowerSetRequest与PowerRequestExecutionRequired和/或PowerRequestAwayModeRequired，但系统仍然进入连接待机模式在几分钟内。我目前使用PowerRequestDisplayRequired来保持它活着，但屏幕总是停留在。

**已编辑。**这是测试应用程序。在我按下硬件电源键和屏幕关闭（使用电池运行）后，计时器滴答不超过5分钟。

using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace CsTestApp
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();

            this.Load += MainForm_Load;
        }

        void MainForm_Load(object sender, EventArgs e)
        {
            // init timer

            var timer = new System.Windows.Forms.Timer();
            timer.Interval = 1000;
            timer.Tick += delegate 
            { 
                System.Diagnostics.Trace.WriteLine("CsTestApp: " + DateTime.Now); 
            };
            timer.Start();

            // set GUID_EXECUTION_REQUIRED_REQUEST_TIMEOUT

            IntPtr pActiveSchemeGuid;
            var hr = PowerGetActiveScheme(IntPtr.Zero, out pActiveSchemeGuid);
            if (hr != 0)
                Marshal.ThrowExceptionForHR((int)hr);
            Guid activeSchemeGuid = (Guid)Marshal.PtrToStructure(pActiveSchemeGuid, typeof(Guid));
            LocalFree(pActiveSchemeGuid);

            int savedTimeout;
            hr = PowerReadDCValueIndex(
                IntPtr.Zero,
                activeSchemeGuid,
                GUID_IDLE_RESILIENCY_SUBGROUP,
                GUID_EXECUTION_REQUIRED_REQUEST_TIMEOUT,
                out savedTimeout);
            if (hr != 0)
                Marshal.ThrowExceptionForHR((int)hr);

            hr = PowerWriteDCValueIndex(
                IntPtr.Zero,
                activeSchemeGuid,
                GUID_IDLE_RESILIENCY_SUBGROUP,
                GUID_EXECUTION_REQUIRED_REQUEST_TIMEOUT,
                -1);
            if (hr != 0)
                Marshal.ThrowExceptionForHR((int)hr);

            // create power request

            var powerRequestContext = new POWER_REQUEST_CONTEXT();
            powerRequestContext.Version = POWER_REQUEST_CONTEXT_VERSION;
            powerRequestContext.Flags = POWER_REQUEST_CONTEXT_SIMPLE_STRING;
            powerRequestContext.SimpleReasonString = "Disable Connected Standby";
            var powerRequest = PowerCreateRequest(ref powerRequestContext);
            if (powerRequest == IntPtr.Zero)
                ThrowLastWin32Error();

            // set PowerRequestExecutionRequired

            if (!PowerSetRequest(powerRequest, PowerRequestType.PowerRequestExecutionRequired))
                ThrowLastWin32Error();

            this.FormClosed += delegate
            {
                timer.Dispose();

                PowerClearRequest(powerRequest, PowerRequestType.PowerRequestExecutionRequired);
                CloseHandle(powerRequest);

                hr = PowerWriteDCValueIndex(
                    IntPtr.Zero,
                    activeSchemeGuid,
                    GUID_IDLE_RESILIENCY_SUBGROUP,
                    GUID_EXECUTION_REQUIRED_REQUEST_TIMEOUT,
                    savedTimeout);
                if (hr != 0)
                    Marshal.ThrowExceptionForHR((int)hr);

            };
        }

        // power API interop

        static void ThrowLastWin32Error()
        {
            throw new System.ComponentModel.Win32Exception(Marshal.GetLastWin32Error());
        }

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

        [StructLayout(LayoutKind.Sequential)]
        struct PowerRequestContextDetailedInformation
        {
            public IntPtr LocalizedReasonModule;
            public UInt32 LocalizedReasonId;
            public UInt32 ReasonStringCount;
            [MarshalAs(UnmanagedType.LPWStr)]
            public string[] ReasonStrings;
        }

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
        struct POWER_REQUEST_CONTEXT_DETAILED
        {
            public UInt32 Version;
            public UInt32 Flags;
            public PowerRequestContextDetailedInformation DetailedInformation;
        }

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
        struct POWER_REQUEST_CONTEXT
        {
            public UInt32 Version;
            public UInt32 Flags;
            [MarshalAs(UnmanagedType.LPWStr)]
            public string SimpleReasonString;
        }

        const int POWER_REQUEST_CONTEXT_VERSION = 0;
        const int POWER_REQUEST_CONTEXT_SIMPLE_STRING = 0x1;
        const int POWER_REQUEST_CONTEXT_DETAILED_STRING = 0x2;

        static readonly Guid GUID_IDLE_RESILIENCY_SUBGROUP = new Guid(0x2e601130, 0x5351, 0x4d9d, 0x8e, 0x4, 0x25, 0x29, 0x66, 0xba, 0xd0, 0x54);
        static readonly Guid GUID_EXECUTION_REQUIRED_REQUEST_TIMEOUT = new Guid(0x3166bc41, 0x7e98, 0x4e03, 0xb3, 0x4e, 0xec, 0xf, 0x5f, 0x2b, 0x21, 0x8e);

        [DllImport("kernel32.dll", SetLastError = true)]
        static extern IntPtr PowerCreateRequest(ref POWER_REQUEST_CONTEXT Context);

        [DllImport("kernel32.dll", SetLastError = true)]
        static extern bool PowerSetRequest(IntPtr PowerRequestHandle, PowerRequestType RequestType);

        [DllImport("kernel32.dll", SetLastError = true)]
        static extern bool PowerClearRequest(IntPtr PowerRequestHandle, PowerRequestType RequestType);

        [DllImport("kernel32.dll", SetLastError = true, ExactSpelling = true)]
        static extern bool CloseHandle(IntPtr hObject);

        [DllImport("kernel32.dll", SetLastError = true)]
        static extern IntPtr LocalFree(IntPtr hMem);

        [DllImport("PowrProf.dll", CharSet = CharSet.Unicode)]
        static extern UInt32 PowerWriteDCValueIndex(IntPtr RootPowerKey,
            [MarshalAs(UnmanagedType.LPStruct)] Guid SchemeGuid,
            [MarshalAs(UnmanagedType.LPStruct)] Guid SubGroupOfPowerSettingsGuid,
            [MarshalAs(UnmanagedType.LPStruct)] Guid PowerSettingGuid,
            int AcValueIndex);

        [DllImport("PowrProf.dll", CharSet = CharSet.Unicode)]
        static extern UInt32 PowerReadDCValueIndex(IntPtr RootPowerKey,
            [MarshalAs(UnmanagedType.LPStruct)] Guid SchemeGuid,
            [MarshalAs(UnmanagedType.LPStruct)] Guid SubGroupOfPowerSettingsGuid,
            [MarshalAs(UnmanagedType.LPStruct)] Guid PowerSettingGuid,
            out int AcValueIndex);

        [DllImport("PowrProf.dll", CharSet = CharSet.Unicode)]
        static extern UInt32 PowerGetActiveScheme(IntPtr UserPowerKey, out IntPtr ActivePolicyGuid);
    }
}

这是powercfg.exe /requests的输出：

EXECUTION:
[PROCESS] \Device\HarddiskVolume4\Users\avo\Test\CsTestApp.exe
Disable Connected Standby