SetThreadExecutionState is not working when called from windows service

Question

I want prevent system from going to sleep/hibernate from a windows service. I am calling SetThreadExecutionState function to do that. But it seems to have no effec

Answer 1

Here's my solution, hope it helps. Seems to work on Windows 10. Usage:

PowerUtilities.PreventPowerSave();

... then later

PowerUtilities.Shutdown();

Not meant to be re-callable.

using System;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;

namespace KeepAlive
{
    public static class PowerUtilities
    {
        [Flags]
        public enum EXECUTION_STATE : uint
        {
            ES_AWAYMODE_REQUIRED = 0x00000040,
            ES_CONTINUOUS = 0x80000000,
            ES_DISPLAY_REQUIRED = 0x00000002,
            ES_SYSTEM_REQUIRED = 0x00000001
            // Legacy flag, should not be used.
            // ES_USER_PRESENT = 0x00000004
        }
        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        static extern uint SetThreadExecutionState(EXECUTION_STATE esFlags);

        private static AutoResetEvent _event = new AutoResetEvent(false);

        public static void PreventPowerSave()
        {
            (new TaskFactory()).StartNew(() =>
                {
                    SetThreadExecutionState(
                        EXECUTION_STATE.ES_CONTINUOUS
                        | EXECUTION_STATE.ES_DISPLAY_REQUIRED
                        | EXECUTION_STATE.ES_SYSTEM_REQUIRED);
                    _event.WaitOne();

                },
                TaskCreationOptions.LongRunning);
        }

        public static void Shutdown()
        {
            _event.Set();
        }
    }
}