没有注册“Microsoft.Extensions.Logging.ILoggingBuilder"类型的服务 [英] No service for type 'Microsoft.Extensions.Logging.ILoggingBuilder' has been registered

问题描述

我正在使用 .NET core 2.2 构建全新的 Web API.在我的 Startup.cs 中，我在 configure 方法中设置了 ILoggerFactory.当我做这样的事情并添加以下代码时

I am building brand new Web APIs with .NET core 2.2. In my Startup.cs I have set ILoggerFactory in configure method. When I do such a thing and add following code

loggerFactory.AddConsole();
loggerFactory.AddDebug();

我得到信息说这个方法已经过时了，它会在未来的版本中被删除，我应该使用 ILoggingBuilder.没问题，我已经用这个新的日志方法替换了，一旦我启动 Web API 时出现错误

I get information saying that this method is obsolete and it will be removed in future versions, instead I should use ILoggingBuilder.No problem, I have replaced with this new logging method and as soon as I start Web APIs I get error

InvalidOperationException:没有注册Microsoft.Extensions.Logging.ILoggingBuilder"类型的服务.

InvalidOperationException: No service for type 'Microsoft.Extensions.Logging.ILoggingBuilder' has been registered.

我的输出窗口显示了这个

and my output window shows this

无法为方法的参数loggingBuilder"解析Microsoft.Extensions.Logging.ILoggingBuilder"类型的服务.

Could not resolve a service of type 'Microsoft.Extensions.Logging.ILoggingBuilder' for the parameter 'loggingBuilder' of method.

我是 .NET Core 的新手，但我在这里遗漏了什么吗?使用 ILoggerFactury，我无需注册任何服务，日志记录也能正常工作.此处为 Microsoft 文档不是很有帮助.

I am new to .NET core, but am I missing something here? With ILoggerFactury, I did not have to register any services and logging would work just fine. Microsoft's documentation here is not really helpful.

Startup.cs 看起来像这样:

Startup.cs looks like this:

public class Startup
{
    // This method gets called by the runtime. Use this method to add services to the container.
    // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddMvc();
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggingBuilder loggingBuilder)
    {
        loggingBuilder.AddConsole();
        loggingBuilder.AddDebug();

        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler();
        }
        app.UseMvc();

        //app.Run(async (context) =>
        //{
        //    await context.Response.WriteAsync("Hello World!");
        //});
    }
}

Program.cs 看起来像这样:

Program.cs looks like this:

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

    public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .UseStartup<Startup>();
}

推荐答案

它不起作用，因为您没有使用您的依赖注入容器注册日志记录组件.有两种方法可以做到这一点:

It's not working because you're not registering the logging components with your dependency injection container. There are two ways you can do this:

将其配置为 CreateWebHostBuilder 的一部分:

Either configure it as part of the CreateWebHostBuilder:

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
    WebHost.CreateDefaultBuilder(args)
        .ConfigureLogging((hostingContext, logging) =>
        {
            logging.AddConsole();
            logging.AddDebug();
        })
        .UseStartup<Startup>();

或者，在 ConfigureServices 下向您的服务集合注册它:

Or, alternatively, register it with your service collection under ConfigureServices:

services.AddLogging(logging =>
{
    logging.AddConsole();
    logging.AddDebug();
});

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