Wallsmedia.Microsoft.Extensions.Logging.NLog 3.0.0

Microsoft.Extensions.Logging.NLog is an adapter between NLog and Microsoft.Extensions.Logging.

It allows to simplify using NLog by utilizing ILoggerFactory and ILogger interfaces in an application.

NLog is a flexible and free logging platform for various .NET platforms, including .NET standard. NLog makes it easy to write to several targets. (database, file, console) and change the logging configuration on-the-fly.

Adding Microsoft.Extensions.Logging.NLog

You have to define two configurations:

Create the NLog configuration xml

Create NLogLoggerSettings configuration section in "appsettings.json".

The NLogLoggerSettings section defines the Category Name "filter" and Category Name "mapper".

{
"NLogLoggerSettings": {

    "IncludeScopes": true,

    "AcceptedCategoryNames": [ /* Filter of category name */
      "ConsoleInfo",   /* The category name is accepted as a "NLog logger name" */
      "CommonInfo",    /* The category name is accepted as a "NLog logger name" */
      "ConsoleError",  /* The category name is accepted as a "NLog logger name" */
      "FatalError",    /* The category name is accepted as a "NLog logger name" */
      "BusinessError", /* The category name is accepted as a "NLog logger name" */
      "*Error*",       /* The category name that contains "Error" is accepted as a "NLog logger name" */
      "*Info",         /* The category name that ends with "Info" is accepted as a "NLog logger name" */
      "Com*",          /* The category name that starts with "Com" is accepted as a "NLog logger name" */
      "*"              /* Any category name will be accepted  as a "NLog logger name" */
    ],

    /* Map category name "ABC" to "NLog logger name" = "ConsoleError" */
    "AcceptedAliasesCategoryNames:ABD": "ConsoleError"  
    
    /* Map category name that ends with "*Hosted" to "NLog logger name" = "ConsoleError" */
    "AcceptedAliasesCategoryNames:*Hosted": "ConsoleError"  

    /* Map category name that starts with "Microsoft.AspNetCore*" to "NLog logger name" = "ConsoleError" */
    "AcceptedAliasesCategoryNames:Microsoft.AspNetCore*": "ConsoleError" 

    /* Map category name that contains "*AspNetCore*" to "NLog logger name" = "ConsoleError"*/
    "AcceptedAliasesCategoryNames:*AspNetCore*": "ConsoleError"

    /* Map any category  to "NLog logger name" = "ConsoleError" */
    "AcceptedAliasesCategoryNames:*": "ConsoleError"

  }
}

• The AcceptedCategoryNames - "category name filter" is used to filter-in category names. It is expected that the category name is exact match to <logger name="...." in the NLog xml configuration.

• The AcceptedAliasesCategoryNames - "category name mapper" is used to filter-in category names and map them onto new name that expected to be match to <logger name="..." in the NLog xml configuration.

Web Host Builder configuration

After defining the configurations, add in the Web Host Builder configuring of Microsoft.Extensions.Logging.LoggerFactory the following initialization code:

     .ConfigureLogging((hostingContext, logging) =>
       {

        // ** Add Microsoft.Extensions.Logging.NLog

        string logPath = Path.Combine(hostingContext.HostingEnvironment.ContentRootPath, $"nlog.{hostingContext.HostingEnvironment.EnvironmentName}.config");
        if (!File.Exists(logPath))
        {
            throw new MissingMemberException($"Missing NLog configuration file '{logPath}'");
        }
        var nLoggingConfiguration = new XmlLoggingConfiguration(logPath);

        var logJsonCgf = hostingContext.Configuration.GetSection(nameof(NLogLoggerSettings));
        if (!logJsonCgf.Exists())
        {
            throw new MissingMemberException($"Missing configuration section '{nameof(NLogLoggerSettings)}'");
        }

        logging.AddNLogLogger(logJsonCgf, nLoggingConfiguration);
      }

Example projects

See sample of pure NLog style project Using Adaptation NLog in .Net Core Rest Web Application

See sample of pure .Net Core Logger ⇒ NLog style project Using Logger + NLog in .Net Core Rest Web Application

Microsoft.Extensions.Logging - Configuration

If you decided to use additional filtering from Microsoft.Extensions.Logging over the filtering that provided with Microsoft.Extensions.Logging.NLog by adding configuration:

 logging.AddConfiguration(hostingContext.Configuration.GetSection("Logging"));

So, It is recommend to read "how to configure the Logging'" section from ASP.NET CORE web guide https://docs.microsoft.com/en-us/aspnet/core/fundamentals/logging/?view=aspnetcore-3.0#configuration.