c# – log4net的logger包装器的实现和使用

这个问题与 Steven的回答有关 – here.他提出了一个非常好的记录器包装器.我将在下面粘贴他的代码：

public interface ILogger
{
    void Log(LogEntry entry);
}

public static class LoggerExtensions
{
    public static void Log(this ILogger logger,string message)
    {
        logger.Log(new LogEntry(LoggingEventType.information,message,null));
    }

    public static void Log(this ILogger logger,Exception exception)
    {
        logger.Log(new LogEntry(LoggingEventType.Error,exception.Message,exception));
    }

    // More methods here.
}

所以,我的问题是创建代理到log4net的实现的正确方法是什么？我应该只使用类型参数添加另一个Log扩展方法,然后在里面创建一个开关吗？在LoggingEventType的情况下使用不同的log4net方法？

第二个问题,以后在代码中使用它的最佳方法是什么？

因为他写道：

(…) you can easily create an ILogger implementation (…) and configure
your DI container to inject it in classes that have a ILogger in their
constructor.

这是否意味着每个会记录的类(基本上都是每个)都应该在其构造函数中使用ILogger？

解决方法

So,my question is what is the proper way to create implementation that proxies to log4net?

你应该创建类似的东西：

public class Log4netAdapter : ILogger
{
    private readonly log4net.ILog m_Adaptee;

    public Log4netAdapter(log4net.ILog adaptee)
    {
        m_Adaptee = adaptee;
    }

    public void Log(LogEntry entry)
    {
        //Here invoke m_Adaptee
        if(entry.Severity == LoggingEventType.Debug)
            m_Adaptee.Debug(entry.Message,entry.Exception);
        else if(entry.Severity == LoggingEventType.information)
            m_Adaptee.Info(entry.Message,entry.Exception);
        else if(entry.Severity == LoggingEventType.Warning)
            m_Adaptee.Warn(entry.Message,entry.Exception);
        else if(entry.Severity == LoggingEventType.Error)
            m_Adaptee.Error(entry.Message,entry.Exception);
        else
            m_Adaptee.Fatal(entry.Message,entry.Exception);
    }
}

Does that mean that every class that will log sth (so basically every),should have ILogger in its constructor?

据我所知,史蒂文斯回答：是的,你应该这样做.

what is the best way to use it later in the code?

如果您使用DI容器,则只需使用DI容器将ILogger映射到Log4netAdapter.您还需要注册log4net.ILog,或者只是将一个log4net记录器实例提供给DI容器,以将其注入Log4netAdapter构造函数.

如果您不使用DI容器,即使用Pure DI,那么您执行以下操作：

ILog log = log4net.LogManager.GetLogger("MyClass");

ILogger logging_adapter = new Log4netAdapter(log);

var myobject = new MyClass(other_dependencies_here,logging_adapter);