AOP via extension method

gistfile1.cs

public static class DelegateExtensions
{
    public static Func<T> Before<T>(this Func<T> func, Action before)
    {
        return () =>
                   {
                       before();
                       return func();
                   };
    }
    public static Func<T> After<T>(this Func<T> func, Action after)
    {
        return () =>
                   {
                       T value = func();
                       after();
                       return value;
                   };
    }
}