没有注册类型'Microsoft.Extensions.Logging.ILogger'的服务 [英] No service for type 'Microsoft.Extensions.Logging.ILogger' has been registered

问题描述

创建了一个空白的ASP.NET Core 2.0应用程序.在Startup.cs中，要记录传入的请求.所以在配置方法中，我使用的是Microsoft.Extensions.Logging.ILogger

Created a blank ASP.NET Core 2.0 application. In Startup.cs, would like to log incoming requests. So in configure method, I am using Microsoft.Extensions.Logging.ILogger

  public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILogger logger)
  {    
      app.Use(next =>
        {
            return async context =>
            {
                logger.LogInformation("Incoming request");
                await next(context);
                logger.LogInformation("Outgoing response");
            };
        });

但是，当我构建项目时，它会抱怨

However, when I build the project, its complaining

 An error occurred while starting the application.
 InvalidOperationException: No service for type 'Microsoft.Extensions.Logging.ILogger' has been registered.

为什么以及如何注册此服务?如果这是我的界面，那么这样做仍然很有意义

Why and how should I register this service? Had it been my interface, it would have still made sense to do

services.AddScope

在ConfigureServices中

in ConfigureServices

推荐答案

ILogger始终是一种类型，请尝试像这样更改它:

ILogger is always of a type, try change it like this:

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILogger<Startup> logger)
  {    
      app.Use(next =>
        {
            return async context =>
            {
                logger.LogInformation("Incoming request");
                await next(context);
                logger.LogInformation("Outgoing response");
            };
        });

这篇关于没有注册类型'Microsoft.Extensions.Logging.ILogger'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！