public override void OnEntry(PostSharp.Laos.MethodExecutionEventArgs eventArgs)
        {
            base.OnEntry(eventArgs);

            object[] actueleParameters = eventArgs.GetReadOnlyArgumentArray();
            ParameterInfo[] formeleParameters = eventArgs.Method.GetParameters();

            for (int i = 0; i < actueleParameters.Length; i++)
            {
                bool isGoed = controleerParameter(actueleParameters[i], formeleParameters[i]);

                if (!isGoed) throw new Exception("Ongeldig type");
                object[] att = formeleParameters[i].GetCustomAttributes(false);

                foreach(object o in att)
                {
                    Validator v = (Validator)o;
                    if (!v.validate(actueleParameters[i])) throw new Exception("getal niet binnen range");
                }
            }

            Console.WriteLine("Methode Entry: " + eventArgs.Method.Name);
        }

        private bool controleerParameter(object actueleParameter, ParameterInfo formeleParameter)
        {
            if (actueleParameter.GetType() == formeleParameter.ParameterType)
            {
                return true;
            }
            return false;
        }
    }