没有注册类型'Microsoft.Extensions.Logging.ILoggingBuilder'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，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();

我得到的信息是此方法已过时，它将在以后的版本中删除，我应该使用 ILoggingBuilder 。没问题，我已经用这种新的日志记录方法替换了，一旦启动Web API，我就会报错

I get information saying that this method is obsolete and it will be removed in future versions, instead I should use ILoggingBuilder.No problem, I have replaced with this new logging method and as soon as I start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：没有注册类型为'Microsoft.Extensions.Logging.ILoggingBuilder'的服务。

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

，我的输出窗口显示此

无法解析参数'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.

.NET核心是我的新手，但是我在这里缺少什么吗？使用ILoggerFactury，我不必注册任何服务，日志记录就可以正常工作。 此处是Microsoft的文档并不是很有帮助。

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，因为您不要在依赖项注入容器中注册日志记录组件。有两种方法可以执行此操作：

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:

可以将其配置为 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，也可以在 ConfigureServices ：

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

这篇关于没有注册类型'Microsoft.Extensions.Logging.ILoggingBuilder'的服务的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！