c# - 程序类中的 Serilog

Question

我正在尝试在 ASP.NET Core 应用程序的 Program.cs 类中使用 Serilog 进行日志记录。我当前的设置如下:

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>();
}

我可以通过执行以下操作成功登录 Controller 类:

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

但是，当尝试在 program 类中复制此内容时，在 Main(string[] args) 中无法访问 _log:

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>();
}

如何配置 Serilog 登录 program 类？

Answer 1

构建 Web 主机后，IWebHost暴露 IWebHost.Services Property

public IServiceProvider Services { get; }

可用于解决所需的依赖关系。

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>();
}

请记住包含 using Microsoft.Extensions.DependencyInjection;为了能够访问.GetService<T>() IServiceProvider 上的扩展方法.