One Extension Method for log4Net

// added the TActor
 public class Switch<TKey,TDecision,TActor,TParameter> {
      protected static Func<TDecision, bool> Decision;
      protected static Action<TActor, TParameter> OnTrue;
      protected static Action<TActor, TParameter> OnFalse;

      public void Process(TDecision d,TActor o, Func<TParameter> param)
      {
         if (Decision(d))
         {
            OnTrue(o, param());
         }
         else
         {
            OnFalse(o, param());
         }
      }

      public void ProcessOnlyTrue(TDecision d, TActor o, Func<TParameter> param)
      {
         if (Decision(d))
         {
            OnTrue(o, param());
         }
      }

      public void ProcessOnlyFalse(TDecision d,TActor o, Func<TParameter> param)
      {
         if (!Decision(d))
         {
            OnFalse(o, param());
         }
      }

   }

   public class Switch<TKey, TDecision, TParameter> : Switch<TKey,TDecision,TDecision,TParameter> {
      public void Process(TDecision d,Func<TParameter> param ) {
         Process(d,d,param);
      }
      public void ProcessOnlyTrue(TDecision d, Func<TParameter> param)
      {
         ProcessOnlyTrue(d, d, param);
      }
      public void ProcessOnlyFalse(TDecision d, Func<TParameter> param)
      {
         ProcessOnlyFalse(d, d, param);
      }
   }

   public class Debug : Switch<Debug, ILog, string> {
      static Debug() {
         Decision = log => log.IsDebugEnabled;
         OnTrue = (log, msg) => log.Debug(msg);
      }
   }

   public class Info : Switch<Info, ILog, string> {
      static Info() {
         Decision = log => log.IsInfoEnabled;
         OnTrue = (log, msg) => log.Info(msg);
      }
   }

   public static class ILogExtensions {
      public static void Log<T>(this ILog log, Func<string> msg ) where T : Switch<T, ILog, string>,new() {
         new T().ProcessOnlyTrue(log,msg);
      }
   }