Log4Net not logging information in .NET 8

Question

I'm trying to use Log4Net in my .NET 8 application

This is my log4net config:

<?xml version="1.0" encoding="utf-8"?>
<log4net>
    <root>
        <level value="ALL" />
        <appender-ref ref="RollingXMLFile" />
    </root>
    <appender name="RollingXMLFile" type="log4net.Appender.RollingFileAppender">
        <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
        <file value="C:\\AppPath\\Log.txt" />
        <appendToFile value="true" />
        <maximumFileSize value="5000KB" />
        <maxSizeRollBackups value="2" />
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%date{yyyy-MM-dd HH:mm:ss} [%-5level] [%logger{2}] - %message%newline" />
    </layout>
    <filter type="log4net.Filter.LevelRangeFilter">
      <levelMin value="INFO" />
      <levelMax value="FATAL" />
    </filter>
    <filter type="log4net.Filter.DenyAllFilter" />
    </appender>
</log4net>

When I try to run the application, I only see entries for ERROR and CRITICAL levels. Every other level is ignored.

Log4Net worked fine for my .NET 4.8 application. Is there any setting/configuration I am missing for .NET 8?

Answer 1

code image Please let me know if this works

Based on your code, you can refer to the following sample (it works well on my side):

1. Create a Net 8 MVC application and install the following package via NuGet:

      <ItemGroup>
        <PackageReference Include="log4net" Version="3.0.4" />
        <PackageReference Include="Microsoft.Extensions.Logging.Log4Net.AspNetCore" Version="8.0.0" />
      </ItemGroup>
   

2. Create a log4net.config config file in the application’s root folder

    <?xml version="1.0" encoding="utf-8"?>
    <log4net>
        <root>
            <level value="ALL" />
            <appender-ref ref="RollingXMLFile" />
        </root>
        <appender name="RollingXMLFile" type="log4net.Appender.RollingFileAppender">
            <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
            <file value="app.txt" />
            <appendToFile value="true" />
            <maximumFileSize value="5000KB" />
            <maxSizeRollBackups value="2" />
            <layout type="log4net.Layout.PatternLayout">
                <conversionPattern value="%date{yyyy-MM-dd HH:mm:ss} [%-5level] [%logger{2}] - %message%newline" />
            </layout>
            <filter type="log4net.Filter.LevelRangeFilter">
                <levelMin value="INFO" />
                <levelMax value="FATAL" />
            </filter>
            <filter type="log4net.Filter.DenyAllFilter" />
        </appender>
    </log4net>
   

3. Create a Services folder, and add a Log4netExtensions.cs class in the Service folder:

    public static class Log4netExtensions
    {
        public static void AddLog4net(this IServiceCollection services, string log4netconfig)
        {
            XmlConfigurator.Configure(new FileInfo(log4netconfig));
            services.AddSingleton(LogManager.GetLogger(typeof(Program)));
        }
    }
   

4. In the Program.cs file, register the Log4Net service use the following code:

    builder.Logging.AddLog4Net("log4net.config");
   

5. In the controller, inject the logger and add logs:

    public class HomeController : Controller
    {
        private readonly ILogger<HomeController> _logger;
   
        public HomeController(ILogger<HomeController> logger)
        {
            _logger = logger;
        }
   
        public IActionResult Index()
        {
            _logger.LogInformation("This is a default informational log.");
            _logger.LogDebug("This is a default LogDebug log.");
            _logger.LogWarning("This is a default LogWarning log.");
            _logger.LogError("This is a default LogError log.");
            _logger.LogCritical("This is a default LogCritical log.");
   
            return View();
        }
   

The result as below: in the application folder, find the app.txt file from bin\debug\net8.0 folder.