Log4Net的XML配置需要ILoggerRepository。

Question

我正在构建一个C#控制台应用程序，使用了Autofac和log4net。我按照Autofac的指南添加了log4net模块，但是我配置日志时遇到了一些困难。问题在于当我尝试创建XMLConfiguration时，编译器要求我提供ILoggerRepository，但我不知道这是什么。我查阅了log4net文档，但在这个上下文中没有提到该存储库。

这是我的模块:

using System.Reflection;
using log4net;
using Autofac.Core;
using Autofac.Core.Registration;
using System.Linq;
using log4net.Config;
using System.IO;

namespace Logging
{
    public class LoggingModule : Autofac.Module
    {
        public LoggingModule()
        {
            // The error happens here!
            XmlConfigurator.Configure(new FileInfo("log4net.xml"));
        }

        private static void InjectLoggerProperties(object instance)
        {
            var instanceType = instance.GetType();

            // Get all the injectable properties to set.
            // If you wanted to ensure the properties were only UNSET properties,
            // here's where you'd do it.
            var properties = instanceType
              .GetProperties(BindingFlags.Public | BindingFlags.Instance)
              .Where(p => p.PropertyType == typeof(ILog) && p.CanWrite && p.GetIndexParameters().Length == 0);

            // Set the properties located.
            foreach (var propToSet in properties)
            {
                propToSet.SetValue(instance, LogManager.GetLogger(instanceType), null);
            }
        }

        private static void OnComponentPreparing(object sender, PreparingEventArgs e)
        {
            e.Parameters = e.Parameters.Union(
              new[]
              {
        new ResolvedParameter(
            (p, i) => p.ParameterType == typeof(ILog),
            (p, i) => LogManager.GetLogger(p.Member.DeclaringType)
        ),
              });
        }

        protected override void AttachToComponentRegistration(IComponentRegistryBuilder componentRegistryBuilder, IComponentRegistration registration)
        {
            // Handle constructor parameters.
            registration.Preparing += OnComponentPreparing;

            // Handle properties.
            registration.Activated += (sender, e) => InjectLoggerProperties(e.Instance);
        }
    }
}

编译错误发生在这里：XmlConfigurator.Configure(new FileInfo("log4net.xml"));，错误提示如下：

Severity    Code    Description Project File    Line    Suppression State
Error   CS1503  Argument 1: cannot convert from 'System.IO.FileInfo' to 'log4net.Repository.ILoggerRepository'  MyApp   C:\Dev\MyApp\Logging\LoggingModule.cs   15  Active

- Felipe

---

你能检查一下 XmlConfigurator 的命名空间吗？看起来使用的 XmlConfigurator 类不是来自于 log4net。尝试使用 log4net.XmlConfigurator.Configure(new FileInfo("log4net.xml")); 进行配置。 - Chetan

嗨，我认为我正在使用正确的类。我已经将我的代码更改为：log4net.Config.XmlConfigurator.Configure(new FileInfo("log4net.xml")); 但错误仍然存在。 - Felipe

Answer 1

我已经通过这个问题的答案解决了我的问题。

以下是我如何添加ILoggerRepository并将其添加到配置中：

ILoggerRepository repository = log4net.LogManager.GetRepository(Assembly.GetCallingAssembly());
log4net.Config.XmlConfigurator.Configure(repository, new FileInfo("log4net.xml"));

这里是我的完整工作代码：

using System.Reflection;
using log4net;
using Autofac.Core;
using Autofac.Core.Registration;
using System.Linq;
using log4net.Config;
using System.IO;
using log4net.Repository;

namespace Logging
{
    public class LoggingModule : Autofac.Module
    {
        public LoggingModule()
        {
            ILoggerRepository repository = LogManager.GetRepository(Assembly.GetCallingAssembly());
            XmlConfigurator.Configure(repository, new FileInfo("log4net.xml"));
        }

        private static void InjectLoggerProperties(object instance)
        {
            var instanceType = instance.GetType();

            // Get all the injectable properties to set.
            // If you wanted to ensure the properties were only UNSET properties,
            // here's where you'd do it.
            var properties = instanceType
              .GetProperties(BindingFlags.Public | BindingFlags.Instance)
              .Where(p => p.PropertyType == typeof(ILog) && p.CanWrite && p.GetIndexParameters().Length == 0);

            // Set the properties located.
            foreach (var propToSet in properties)
            {
                propToSet.SetValue(instance, LogManager.GetLogger(instanceType), null);
            }
        }

        private static void OnComponentPreparing(object sender, PreparingEventArgs e)
        {
            e.Parameters = e.Parameters.Union(
              new[]
              {
        new ResolvedParameter(
            (p, i) => p.ParameterType == typeof(ILog),
            (p, i) => LogManager.GetLogger(p.Member.DeclaringType)
        ),
              });
        }

        protected override void AttachToComponentRegistration(IComponentRegistryBuilder componentRegistryBuilder, IComponentRegistration registration)
        {
            // Handle constructor parameters.
            registration.Preparing += OnComponentPreparing;

            // Handle properties.
            registration.Activated += (sender, e) => InjectLoggerProperties(e.Instance);
        }
    }
}

- Felipe