Get Type object representing a generic type from which the current generic type in CSharp

//from ww w.j  a v  a  2 s .com
using System;
using System.Reflection;
using System.Collections.Generic;

public class Test
{
    public static void Main()
    {
        Dictionary<string, Test> d = new Dictionary<string, Test>();
        Type constructed = d.GetType();
        DisplayTypeInfo(constructed);

        Type generic = constructed.GetGenericTypeDefinition();
        DisplayTypeInfo(generic);
    }

    private static void DisplayTypeInfo(Type t)
    {
        Console.WriteLine(t.IsGenericTypeDefinition);
        Console.WriteLine(t.IsGenericType);
        Type[] typeArguments = t.GetGenericArguments();
        Console.WriteLine(typeArguments.Length);
        foreach (Type tParam in typeArguments)
        {
            Console.WriteLine("\t\t{0}", tParam);
        }
    }
}