//定义
    Dictionary<string, string> openWith = new Dictionary<string, string>();
//例如使用socket，创建字典代码
　　Dictionary<string,Socket> dic = new Dictionary<string,Socket>();
　　

//添加元素
    dic.Add("txt", "notepad.exe");
//例如 字典添加地址
　　string ip=connSocket.RemoteEndPoint.ToString();
　　dic.Add(ip,cooSocket);
    

//取值
    Console.WriteLine("For key = \"rtf\", value = {0}.", openWith["rtf"]);

 //更改值
    openWith["rtf"] = "winword.exe";
    Console.WriteLine("For key = \"rtf\", value = {0}.", openWith["rtf"]);

//遍历key
    foreach (string key in openWith.Keys)
    {
        Console.WriteLine("Key = {0}", key);
    }

 //遍历字典
    foreach (KeyValuePair<string, string> kvp in openWith)
    {
        Console.WriteLine("Key = {0}, Value = {1}", kvp.Key, kvp.Value);
    }

 //遍历value
    foreach (string value in openWith.Values)
    {
        Console.WriteLine("value = {0}", value);
    }

    //遍历value, Second Method
    Dictionary<string, string>.ValueCollection valueColl = openWith.Values;
    foreach (string s in valueColl)
    {
        Console.WriteLine("Second Method, Value = {0}", s);
    }





 //添加存在的元素
    try
    {
        openWith.Add("txt", "winword.exe");
    }
    catch (ArgumentException)
    {
        Console.WriteLine("An element with Key = \"txt\" already exists.");
    }


 //删除元素
    openWith.Remove("doc");
    if (!openWith.ContainsKey("doc"))
    {
        Console.WriteLine("Key \"doc\" is not found.");
    }



//判断键存在
    if (openWith.ContainsKey("bmp")) // True 
    {
        Console.WriteLine("An element with Key = \"bmp\" exists.");
    }


 //参数为其它类型 
    Dictionary<int, string[]> OtherType = new Dictionary<int, string[]>();
    OtherType.Add(1, "1,11,111".Split(','));
    OtherType.Add(2, "2,22,222".Split(','));
    Console.WriteLine(OtherType[1][2]);

首先定义类

    class DouCube
    {
        public int Code { get { return _Code; } set { _Code = value; } } private int _Code;
        public string Page { get { return _Page; } set { _Page = value; } } private string _Page;
    } 

然后

    //声明并添加元素
    Dictionary<int, DouCube> MyType = new Dictionary<int, DouCube>();
    for (int i = 1; i <= 9; i++)
    {
        DouCube element = new DouCube();
        element.Code = i * 100;
        element.Page = "http://www.doucube.com/" + i.ToString() + ".html";
        MyType.Add(i, element);
    }

    //遍历元素
    foreach (KeyValuePair<int, DouCube> kvp in MyType)
    {
        Console.WriteLine("Index {0} Code:{1} Page:{2}", kvp.Key, kvp.Value.Code, kvp.Value.Page);
    }