ASP.NET 5: How to configure the path of logs in Microsoft.Extensions.Logging

Question

I'm working on an MVC6 web app and I'm new to ASP.NET 5. I can see that the Logging (Microsoft.Extensions.Logging) is used at many places (eg: AccountController.cs) in ASP.NET 5 default web application template, but I couldn't figure out where to configure the path of the created log file. Below settings are found in appsettings.json file.

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

Is it enough to add a parameter in this section? If yes, what is the parameter name? If no, how to do it?

Previously I used Log4Net and configurations were done inside logger.config file.

score 9 · Accepted Answer · edited Jul 13 '16 at 16:46

9

ILogger is just an abstraction, you have to implement a concrete logger (log4net, serilog, ...) to log in a file.

public Startup(IHostingEnvironment env)
{
    // Some other code 

    Log.Logger = new LoggerConfiguration()
            .MinimumLevel.Debug().WriteTo.File("YOUR FILE PATH HERE")
            .CreateLogger();

}

In configure's method (using serilog here) :

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
    loggerFactory.AddSerilog();

    // Some other code
}

Official documentation

edited Jul 13 '16 at 16:46

afzalulh

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answered May 02 '16 at 07:59

AdrienTorris

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1

Ok.. Now I understood. Thank you very much. – Sudeep A R May 02 '16 at 08:47

Mike · Answer 2 · 2016-05-02T07:33:23.910

3

There is no built-in file logger in ASP.NET Core. Logging Github repository

But there is a port to use log4net on ASP.NET Core. Link to sources and the blog post

edited May 02 '16 at 07:33

answered May 02 '16 at 07:02

Mike

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What about Microsoft.Extensions.Logging namesapce and ILogger interface? – Sudeep A R May 02 '16 at 07:39
@SudeepAR its just an abstraction that you can use to build your own loggers, no concrete implementation for logging into file – Mike May 02 '16 at 07:40
Really? Forgive me if I'm wrong, what about the implementations in LoggerExtensions class inside Microsoft.Extensions.Logging namespace? – Sudeep A R May 02 '16 at 07:42
@SudeepAR they are just extension methods on ILogger interface – Mike May 02 '16 at 07:49
Ok.. Now I understood. Thank you very much. – Sudeep A R May 02 '16 at 08:45

score 1 · Answer 3 · answered May 09 '20 at 01:15

Use Serilog, Add file logging to ASP.NET Core apps with one line of code.

Install Serilog.Extensions.Logging.File

Host.CreateDefaultBuilder(args)
            .ConfigureLogging((hostingContext, builder) =>
            {
                builder.AddFile("Logs/myapp-{Date}.txt");
            })

https://github.com/serilog/serilog-extensions-logging-file

ASP.NET 5: How to configure the path of logs in Microsoft.Extensions.Logging

3 Answers3