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.

I\

Answer 1

I hope you found the solution for this problem.

In my case I used generic host (introduced in 2.1) for such purpose and then just wrap it up with systemd to run it as a service on Linux host.

I wrote a small article about it https://dejanstojanovic.net/aspnet/2018/june/clean-service-stop-on-linux-with-net-core-21/

I hope this helps

Answer 2

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<IApplicationLifetime>()
            .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);
    }
}

Answer 3

IHostedService if for [asp.net core] backendjob, if u want to build a windows service on .net core, u should reference this package System.ServiceProcess.ServiceController, and use ServiceBase as base class. (you can also start from a .net framework windows service and then change the .csproj file)

---

edit: please see this doc and this code https://github.com/aspnet/Hosting/blob/dev/src/Microsoft.AspNetCore.Hosting.WindowsServices/WebHostWindowsServiceExtensions.cs. To create a windows service ServiceBase for manage your IHost