Serilog in program class

Question

I am trying to log with Serilog in an ASP.NET Core application's Program.cs class. My current setup is as follows:

public class Program
{
    public static void Main(string[] args)
    {
        DoStuff();
        CreateWebHostBuilder(args).Build().Run();
    }
    public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .ConfigureLogging((hostingContext, builder) =>
            {
                builder.AddFile(@"C:\...\log-{Date}.txt", isJson: true);
            })
            .UseStartup<Startup>();
}

I can successfully log in a Controller class by doing:

public class WebhookController : Controller
{
    readonly ILogger<WebhookController> _log;
    public WebhookController(ILogger<WebhookController> log)
    {
        _log = log;
    }
    public IActionResult Index()
    {
        _log.LogInformation("hello world");
        return View();
    }
}

However, when trying to replicate this in the program class, _log is not accessible in Main(string[] args):

public class Program
{
    readonly ILogger<Program> _log;
    public Program(ILogger<Program> log)
    {
        _log = log;
    }

    public static void Main(string[] args)
    {
        DoStuff();
        CreateWebHostBuilder(args).Build().Run();
    }

    public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .ConfigureLogging((hostingContext, builder) =>
            {
                builder.AddFile(@"C:\...\log-{Date}.txt", isJson: true);
            })
            .UseStartup<Startup>();
}

How can I configure Serilog to log in the program class?

You added a constructor named WebhookController to your program class, and you expected that to what? Work? — R. Richards
– R. Richards, Commented Dec 23, 2018 at 15:06
Thanks for bringing that to my attention. No, I didn't actually do that, it's rather late where I am and I must've copy and pasted without double checking! — Harry Stuart
– Harry Stuart, Commented Dec 23, 2018 at 15:11
Got it! Thanks for clarifying. See this for some ideas on how to set up Serilog in .NET Core. — R. Richards
– R. Richards, Commented Dec 23, 2018 at 15:27

Nkosi · Accepted Answer · 2018-12-24 02:46:21Z

When the web host is built, the IWebHost exposes IWebHost.Services Property

public IServiceProvider Services { get; }

which can be used to resolve the desired dependencies.

public class Program {

    public static void Main(string[] args) {
        var webHost = CreateWebHostBuilder(args).Build();
        var services = webHost.Services;

        var log = services.GetService<ILogger<Program>>();

        DoStuff(log);

        webHost.Run();
    }

    static void DoStuff(ILogger<Program> log) {
        //...
    }

    public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .ConfigureLogging((hostingContext, builder) =>
            {
                builder.AddFile(@"C:\...\log-{Date}.txt", isJson: true);
            })
            .UseStartup<Startup>();
}

Remember to include using Microsoft.Extensions.DependencyInjection; in order to have access to the .GetService<T>() extension method on IServiceProvider.

Meir Blachman · Accepted Answer · 2018-12-23 18:05:26Z

0

try adding Program to your services. something like this:

.Configure(services => services.AddTransiant<Program>())

answered Dec 23, 2018 at 18:05

Meir Blachman

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