I have the problem with Log4NET in combination with ASP.NET 7.0 that it doesn’t write to my Logfile, but he creates the Logfile and writes to the console.
So I read a lot about assembly references, log4net layout patterns etc. but nothing worked. In StartupBase, I configure Log4Net by passing the log4net.config.
The log4net.config is found, I testet it by renaming .
After renaming, the file changed, too. So, I think the config file was found.

StartUpBase.cs

public class StartUpBase
{
   public ILog Logger { get; set;  }

   public void ConfigureServiceBase(IServiceCollection services)
   {
       var repo = LogManager.CreateRepository(
       Assembly.GetEntryAssembly(), typeof(log4net.Repository.Hierarchy.Hierarchy));
       XmlConfigurator.Configure(repo, new FileInfo("log4net.config"));
       Logger = LogManager.GetLogger(typeof(StartUpBase));
       services.AddSingleton(typeof(ILog), Logger);
   }

}

Startup.cs

public class Startup : StartUpBase
{
    public Startup(IWebHostEnvironment env, IConfiguration configuration) : base(env, configuration)
    {
        
    }

    public void ConfigureServices(IServiceCollection services)
    {
        ConfigureServiceBase(services);
      
        ...
    }

    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        ...
    }
}

Program.cs

  class ServiceTemplate
  {
      static void Main(string[] args)
      {

          BuildWebHost(args).Run();

      }

      public static IWebHost BuildWebHost(string[] args)
      {
          return WebHost.CreateDefaultBuilder(args)
           .UseStartup<Startup>()
           .Build();
      }
  }

Root Controller

[ApiController]
 [Route("api/[controller]")]
 public class Root : Controller
 {
     public Root(ILogger<Root> Logger)
     {
         Logger.LogDebug("Hello DEBUG");
         Logger.LogInformation("Hello DEBUG");
         Logger.LogWarning("Hello DEBUG");
         Logger.LogError("Hello DEBUG");
     }
  }

log4net

<log4net debug="true">
  <root>
    <level value="ALL" />
    <appender-ref ref="Console" />
    <appender-ref ref="RollingFile" />
  </root>
  <appender name="RollingFile" type="log4net.Appender.RollingFileAppender">
    <file value="C:RepositoryShareSoftwareLogsServiceTemplate.log" />
    <staticLogFileName value="true" />
    <appendToFile value="true" />
    <rollingStyle value="Composite" />
    <maxSizeRollBackups value="100" />
    <maximumFileSize value="5MB" />
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
    </layout>
  </appender>
  <appender name="Console" type="log4net.Appender.ConsoleAppender">
    <layout type="log4net.Layout.PatternLayout">
      <!-- Pattern to output the caller's file name and line number -->
      <conversionPattern value="%date [%thread] %level %logger - %message%newline" />
    </layout>
  </appender>
</log4net>