Log to Console with .Net Core 2.0 web application

Question

I'm giving my first steps with .Net Core

Just created a web Hello world with

dotnet new web

I can see there's some kind of logging enabled. I just want to log something to the Console.

But I don't know how to access the logger from

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

I tried with Console.WriteLine but it obviously didn't work.

Also tried with NLog following this guide https://github.com/NLog/NLog.Web/wiki/Getting-started-with-ASP.NET-Core-(csproj---vs2017) but I don't know how to inject the logger.

I'm just trying to look around for educational purposes, not looking for a real logger, so perhaps there's a better/easier option.

Logging is well documented here learn.microsoft.com/en-us/aspnet/core/fundamentals/… — Jehof
– Jehof, Commented Aug 31, 2017 at 6:25

opensas · Accepted Answer · 2017-08-31 07:07:30Z

I could achieve it with this:

[...] using Microsoft.Extensions.Logging; [...] namespace web { public class Startup { ILogger log; public Startup(ILoggerFactory loggerFactory) { log = loggerFactory.CreateLogger("Logger"); } [...] public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory) { loggerFactory.AddConsole(); loggerFactory.AddDebug(); [...] app.Run(async (context) => { log.LogInformation("logging!"); await context.Response.WriteAsync("Hello World!"); }); } } }

also had to add an appsettings.json file to the root of the project

{ "Logging": { "IncludeScopes": false, "LogLevel": { "Default": "Debug", "System": "Information", "Microsoft": "Information" } } }

I was banging my head on this for a while. Turns out the default LogLevel was set to Warning and I was logging to Information... Thanks for the push.

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