No service for type 'Microsoft.Extensions.Logging.ILogger' has been registered

Question

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");
            };
        });

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.

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

services.AddScope

in ConfigureServices

Possible duplicate of [Why ASP.NET Core DI knows how to resolve ILogger, but not ILogger?](https://stackoverflow.com/questions/38255053/why-asp-net-core-di-knows-how-to-resolve-iloggert-but-not-ilogger) — Set, Mar 17 '18 at 16:37

Joe Audette · Accepted Answer · 2018-03-16T12:57:22.357

29

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");
            };
        });

edited Mar 16 '18 at 12:57

answered Mar 16 '18 at 12:47

Joe Audette

35,330
11
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99

If I have a Helpers class that is called from different types, like a Controller, View or another helper class, will I need different Helpers constructor for each calling type? Like `Helpers(ILogger logger, IConfiguration configuration)` and `Helpers(ILogger logger, IConfiguration configuration)`? – joym8 Aug 13 '20 at 15:50

Lev K. · Answer 2 · 2022-09-24T10:35:59.130

No service for type 'Microsoft.Extensions.Logging.ILogger' has been registered

This error means that you didn't provide class name into your logger interface(instance of the interface), for example instead of:

ILogger logger

  public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILogger logger)
  {

You should use:

ILogger<Startup> logger

  public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILogger<Startup> logger)
  {

No service for type 'Microsoft.Extensions.Logging.ILogger' has been registered

2 Answers2

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