Configure environment settings

[Vasilut]

Hi. I have a .net core api 2.2 app where I configured my nlog (ConfigureNLog method) based on my configuration:

                public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .ConfigureLogging((hostingContext, logging) =>
            {
                logging.ClearProviders();
                var logConfig = string.IsNullOrEmpty(Environment.GetEnvironmentVariable("env"))
                    ? "NLog.Development.config"
                    : "NLog.config";
                **hostingContext.HostingEnvironment.ConfigureNLog(logConfig);**
            })
            .UseNLog()
            .UseStartup<Startup>();
}

Regarding that some things changed in 3.0, how I can achieve that configuration ? (I searched into the docs but I cannot find anything relevant).
I tried using logging.ConfigureNLog(logConfig); (but I got an obsolete warning):

             public static IHostBuilder CreateHostBuilder(string[] args) =>
        Host.CreateDefaultBuilder(args)
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder.ConfigureLogging((hostingContext, logging) =>
                {
                    logging.ClearProviders();
                    var logConfig = string.IsNullOrEmpty(Environment.GetEnvironmentVariable("env"))
                        ? "NLog.Development.config"
                        : "NLog.config";
                    logging.ConfigureNLog(logConfig);
                    //NLogBuilder.ConfigureNLog(logConfig); -other choice maybe ? 
                })
                .UseNLog()
                .UseStartup<Startup>();
            });

Thanks.

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Document Details

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• ID: ceffa6a2-770c-1cd9-5145-dcd423f9dd22
• Version Independent ID: 1cb5eb30-dd84-e5e1-5826-d74243fabf04
• Content: Use multiple environments in ASP.NET Core
• Content Source: aspnetcore/fundamentals/environments.md
• Product: aspnet-core
• Technology: aspnetcore-fundamentals
• GitHub Login: @Rick-Anderson
• Microsoft Alias: riande

[Rick-Anderson]

Have you tried moving to CreateHostBuilder?
cc @guardrex

[Rick-Anderson]

This is a NLog issue. See NLog/NLog.Web#350

[snakefoot]

@Vasilut Alternative you could setup logging before building host:

var logConfig = string.IsNullOrEmpty(Environment.GetEnvironmentVariable("env"))
                        ? "NLog.Development.config"
                        : "NLog.config";
var logger = NLog.Web.NLogBuilder.ConfigureNLog(logConfig).GetCurrentClassLogger();
logger.Debug("init");

CreateWebHostBuilder(args).Build().Run(); 

See also Program.cs example from NLog Wiki

NLog works fine with NetCore3. But one have to adapt to the now obsolete interfaces in NetCore3, and start using new ones - IHostBuilder.UseNLog()