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I have been fighting with this problem a while now. Really improtant was the Callsite (FullyQualified Namespace) within the logfiles. First, i tryed to get the right logger out of the Stacktrace: <pre><code> [MethodImpl(MethodImplOptions.NoInlining)] private static NLog.Logger GetLogger() { var stackTrace = new StackTrace(false); StackFrame[] frames = stackTrace.GetFrames(); if (null == frames) throw new ArgumentException("Stack frame array is null."); StackFrame stackFrame; switch (frames.Length) { case 0: throw new ArgumentException("Length of stack frames is 0."); case 1: case 2: stackFrame = frames[frames.Length - 1]; break; default: stackFrame = stackTrace.GetFrame(2); break; } Type declaringType = stackFrame.GetMethod() .DeclaringType; return declaringType == null ? LogManager.GetCurrentClassLogger() : LogManager.GetLogger(declaringType.FullName); } </code></pre> But sadly, the Stacktrace with MEF is very long and i cannot clearly identify the correct caller for the Requester of the ILogger. So, instead of injecting the ILogger Interface via Constructor Injection, i have created a ILogFactory Interface, that can get injected via Constructor Injection and call then the Create Method on the Factory <pre><code> public interface ILogFactory { #region Public Methods and Operators /// <summary> /// Creates a logger with the Callsite of the given Type /// </summary> /// <example> /// factory.Create(GetType()); /// </example> /// <param name="type">The type.</param> /// <returns></returns> ILogger Create(Type type); #endregion } </code></pre> And implemented it: <pre><code> using System; using System.ComponentModel.Composition; [Export(typeof(ILogFactory))] [PartCreationPolicy(CreationPolicy.Shared)] public class LogFactory : ILogFactory { #region Public Methods and Operators public ILogger Create(Type type) { var logger = new Logger().CreateLogger(type); return logger; } #endregion } </code></pre> With the ILogger: <pre><code> public interface ILogger { #region Public Properties bool IsDebugEnabled { get; } bool IsErrorEnabled { get; } bool IsFatalEnabled { get; } bool IsInfoEnabled { get; } bool IsTraceEnabled { get; } bool IsWarnEnabled { get; } #endregion #region Public Methods and Operators void Debug(Exception exception); void Debug(string format, params object[] args); void Debug(Exception exception, string format, params object[] args); void Error(Exception exception); void Error(string format, params object[] args); void Error(Exception exception, string format, params object[] args); void Fatal(Exception exception); void Fatal(string format, params object[] args); void Fatal(Exception exception, string format, params object[] args); void Info(Exception exception); void Info(string format, params object[] args); void Info(Exception exception, string format, params object[] args); void Trace(Exception exception); void Trace(string format, params object[] args); void Trace(Exception exception, string format, params object[] args); void Warn(Exception exception); void Warn(string format, params object[] args); void Warn(Exception exception, string format, params object[] args); #endregion } </code></pre> and Implementation of: <pre><code> using System; using NLog; using NLog.Config; /// <summary> /// The logging service. /// </summary> public class Logger : NLog.Logger, ILogger { #region Fields private string _loggerName; #endregion #region Public Methods and Operators /// <summary> /// The get logging service. /// </summary> /// <returns> /// The <see cref="ILogger" />. /// </returns> public ILogger CreateLogger(Type type) { if (type == null) throw new ArgumentNullException("type"); _loggerName = type.FullName; var logger = (ILogger)LogManager.GetLogger(_loggerName, typeof(Logger)); return logger; } </code></pre> To use it... just inject the ILogFactory and calle the Create Method in a Mefed Importing Constructor: <pre><code> [ImportingConstructor] public MyConstructor( ILogFactory logFactory) { _logger = logFactory.Create(GetType()); } </code></pre> hope this helps
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