c# - How to fix obsolete ILoggerFactory methods?

Question

I upgraded my project to .NET Core 2.2.x and got an obsolete warning regarding the following code - both lines:

public void Configure(IApplicationBuilder app, 
                      IHostingEnvironment env, 
                      ILoggerFactory loggerFactory) 
  {
    loggerFactory.AddConsole(Configuration.GetSection("Logging"));

The suggestion to fix is The recommended alternative is AddConsole(this ILoggingBuilder builder). I thought that is what I am using.

What am I missing here?

Answer 1

I had the same issue today.

Remove your logging configuration from Startup.cs and go to your Program.cs file and add something like:

var host = new WebHostBuilder()
    .UseKestrel()
    .UseContentRoot(Directory.GetCurrentDirectory())
    .UseIISIntegration()
    .UseStartup<Startup>()
    .ConfigureLogging((hostingContext, logging) =>
    {
        logging.AddConfiguration(hostingContext.Configuration.GetSection("Logging"));
        logging.AddConsole();
        logging.AddDebug();
    })
    .Build();

This used the 'builder' because the variable 'logging' is an IloggingBuilder (whereas your code is still using ILoggerFactory)

UPDATE: The other method I just tried is to stay inside Startup.cs but move the logging stuff from the 'Configure' method to 'ConfigureServices' like this:

public void ConfigureServices(IServiceCollection services)
{
    services.AddLogging(loggingBuilder =>
    {
        loggingBuilder.AddConfiguration(Configuration.GetSection("Logging"));
        loggingBuilder.AddConsole();
        loggingBuilder.AddDebug();
    });
}

Perhaps keeps the Program.cs less polluted...