想要个IDictionary<K,V> 和Dictionary应用的简单例子？

using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;
using System.IO;
using System.Xml;
using System.Collections.Specialized;
using System.Xml.Serialization;

namespace test
{
public class test
{
static void Main()
{
string text = @"Do you like green eggs and ham?
I don't like them.Sam-I-am";
Dictionary<string, int> frequencies = CounterWords(text);
foreach(KeyValuePair<string,int> entry in frequencies)
{
Console.WriteLine("{0}\t\t{1}:{2}",entry.ToString(),entry.Key,entry.Value);
}

Console.Read();
}
static Dictionary<string, int> CounterWords(string text)
{
Dictionary<string, int> f