NetCore 2.1 Generic Host as a service

Question

I\'m trying to build a Windows Service using the latest Dotnet Core 2.1 runtime. I\'m NOT hosting any aspnet, I do not want or need it to respond to http requests.

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Answer 1

As others have said you simply need to reuse the code that is there for the IWebHost interface here is an example.

public class GenericServiceHost : ServiceBase
{
    private IHost _host;
    private bool _stopRequestedByWindows;

    public GenericServiceHost(IHost host)
    {
        _host = host ?? throw new ArgumentNullException(nameof(host));
    }

    protected sealed override void OnStart(string[] args)
    {
        OnStarting(args);

        _host
            .Services
            .GetRequiredService()
            .ApplicationStopped
            .Register(() =>
            {
                if (!_stopRequestedByWindows)
                {
                    Stop();
                }
            });

        _host.Start();

        OnStarted();
    }

    protected sealed override void OnStop()
    {
        _stopRequestedByWindows = true;
        OnStopping();
        try
        {
            _host.StopAsync().GetAwaiter().GetResult();
        }
        finally
        {
            _host.Dispose();
            OnStopped();
        }
    }

    protected virtual void OnStarting(string[] args) { }

    protected virtual void OnStarted() { }

    protected virtual void OnStopping() { }

    protected virtual void OnStopped() { }
}

public static class GenericHostWindowsServiceExtensions
{
    public static void RunAsService(this IHost host)
    {
        var hostService = new GenericServiceHost(host);
        ServiceBase.Run(hostService);
    }
}