c# - .Net Core 3.1 将 Serilog 与 Microsoft.Extensions.Logger 结合使用

Question

在这个应用程序中，我已经引入并设置了 Serilog，它适用于异常，我想将 Microsoft 的 Logger 与 Serilog 一起使用，但我似乎无法弄清楚如何将它 DI 到服务中而不会出现此错误dotnet 构建。

我不确定让 ILogger 使用 Serilog 实例我缺少什么？

dotnet build 错误:

[13:56:21 FTL] Host terminated unexpectedly
System.AggregateException: Some services are not able to be constructed (Error while validating the service descriptor 'ServiceType: Unable to resolve service for type 'Microsoft.Extensions.Logging.ILogger' while attempting to activate 'App.Services.MyService'.) 

服务中的依赖注入(inject):

using Microsoft.Extensions.Logging;

public class MyService : BaseService
{
    private readonly ILogger _logger;

    public MyService(
        ILogger logger)
        : base(context, httpContext)
    {
        _logger = logger;
    }
    
    // ... Removed for brevity
}

实现

public static int Main(string[] args)
{
    CreateLogger();

    try
    {
        Log.Information("Starting web host");
        CreateHostBuilder(args)
            .Build()
            .Run();
        return 0;
    }
    catch (Exception ex)
    {
        Log.Fatal(ex, "Host terminated unexpectedly");
        return 1;
    }
    finally
    {
        // Ensure buffered logs are written to their target sink
        Log.CloseAndFlush();
    }
}

public static IHostBuilder CreateHostBuilder(string[] args) =>
    Host.CreateDefaultBuilder(args)
        .ConfigureWebHostDefaults(webBuilder => webBuilder.UseStartup<Startup>())
        .UseSerilog();

private static void CreateLogger()
{
    string path = PrimeConstants.LOG_FILE_PATH;

    try
    {
        if (isDevelopment())
        {
            Directory.CreateDirectory(path);
        }
    }
    catch (Exception e)
    {
        Console.WriteLine("Creating the logging directory failed: {0}", e.ToString());
    }

    var name = Assembly.GetExecutingAssembly().GetName();
    var outputTemplate = "[{Timestamp:HH:mm:ss} {Level:u3}] {Message:lj}{NewLine}{Exception}";

    Log.Logger = new LoggerConfiguration()
        .MinimumLevel.Information()
        .MinimumLevel.Override("Microsoft", LogEventLevel.Warning)
        .MinimumLevel.Override("Microsoft.Hosting.Lifetime", LogEventLevel.Information)
        .MinimumLevel.Override("System", LogEventLevel.Warning)
        .Enrich.FromLogContext()
        .Enrich.WithMachineName()
        .Enrich.WithProperty("Assembly", $"{name.Name}")
        .Enrich.WithProperty("Version", $"{name.Version}")
        .WriteTo.Console(
            outputTemplate: outputTemplate,
            theme: AnsiConsoleTheme.Code)
        .WriteTo.Async(a => a.File(
            $@"{path}/prime.log",
            outputTemplate: outputTemplate,
            rollingInterval: RollingInterval.Day,
            shared: true))
        .WriteTo.Async(a => a.File(
            new JsonFormatter(),
            $@"{path}/prime.json",
            rollingInterval: RollingInterval.Day))
        .CreateLogger();
}

Answer 1

ILogger对 DI 不可用。您可以使用以下方法之一:

1. 注入(inject) ILogger<TCategoryName> :

    public class MyService : BaseService
    {
        private readonly ILogger _logger;
   
        public MyService(ILogger<MyService> logger)
            : base(context, httpContext)
        {
            _logger = logger;
        }
   
        // ...
    }
   

2. 注入(inject) ILoggerFactory并使用它的CreateLogger方法:

    public class MyService : BaseService
    {
        private readonly ILogger _logger;
   
        public MyService(ILoggerFactory loggerFactory)
            : base(context, httpContext)
        {
            _logger = loggerFactory.CreateLogger("<YOUR_CATEGORY_NAME>");
        }
   
        // ...
    }
   

我推荐选项 #1，除非您想完全控制日志类别。见 docs详细了解这意味着什么:

That category is included with each log message created by that instance of ILogger.