AspectExtensions.cs

public static class AspectExtensions {

  public static Func<T> Before<T>(this Func<T> f, Action a) {
    return () => { a(); return f(); };
  } 		

  public static Func<T> Success<T>(this Func<T> f, Action a) {
    return () => { 
      var result = f();
      a();
      return result;
    };
  } 

  public static Func<T> Success<T>(this Func<T> f, Action<T> a) {
    return () => { 
      var result = f();
      a(result);
      return result;
    };
  } 

  public static Func<T> After<T>(this Func<T> f, Action a) {
    return () => { 
      try {
        return f();
      } finally {
        a();
      }
    };
  } 
  
  public static Func<T> After<T>(this Func<T> f, Action<T> a) {
    return () => { 
      T result = default(T);
      try {
        result = f();
        return result;
      } finally {
        a(result);
      }
    };
  } 
}