why does passing by ref change result of Type.IsGenericType?

Hi - the following code outputs:

dictionary True
dictionaryByRef False

I would have expected both parameterTypes to return true for IsGenericType. What gives

cheers, colin

using System;

using System.Reflection;

using System.Collections.Generic;

namespace AnotherTest {

class TestType {

public void EatDictionaries(Dictionary<Int32, String> dictionary, ref Dictionary<Int32, String> dictionaryByRef) {

}

}

class MainClass{

public static void Main(String[] args){

Type testType = Type.GetType("AnotherTest.TestType");

MethodInfo method = testType.GetMethod("EatDictionaries");

foreach (ParameterInfo param in method.GetParameters()) {

Console.WriteLine(param.Name + "\t" + param.ParameterType.IsGenericType);

}

Console.Read();

}

}