我想检测计算机何时关机/重启并取消它.
取消后我想做一些动作并重启windows.

我试过了,但它不起作用

using Microsoft.Win32;
partial class MyService: ServiceBase
{
    protected override void OnStart(string[] args)
    {
        SystemEvents.SessionEnding += new SessionEndingEventHandler(OnSessionEnding);
    }

    private void OnSessionEnding(object sender,SessionEndingEventArgs e)
    {
        e.Cancel = true;
        //Do some work...
    }
}

另一个测试：

partial class MyService: ServiceBase
{
    protected override void OnShutdown()
    {
        //Do some work...
        //base.OnShutdown();
    }
}