//Dictionary的Value为一个数组
public static void DicSample2() {     Dictionary<String, String[]> dic = new Dictionary<String, String[]>();     String[] ZheJiang =  { "Huzhou", "HangZhou", "TaiZhou" };     String[] ShangHai = { "Budong", "Buxi" };     dic.Add("ZJ", ZheJiang);     dic.Add("SH", ShangHai);     Console.WriteLine("Output :" + dic["ZJ"][0]); }

//Dictionary的Value为一个类public static void DicSample3() {     Dictionary<String, Student> stuList = new Dictionary<String, Student>();     Student stu = null;     for (int i = 0; i < 3; i++ )     {         stu = new Student();         stu.Name = i.ToString();         stu.Name = "StuName" + i.ToString();         stuList.Add(i.ToString(), stu);     }      foreach (var student in stuList)     {         Console.WriteLine("Output : Key {0}, Num : {1}, Name {2}", student.Key, student.Value.Name, student.Value.Name);     } }

//Student类：public class Student{    public String Num { get; set; }    public String Name { get; set; }}

//Dictionary的扩展方法使用 /// <summary>/// Dictionary的扩展方法使用/// </summary> public static void DicSample4() {     //1)普通调用     Dictionary<int, String> dict = new Dictionary<int, String>();     DictionaryExtensionMethodClass.TryAdd(dict, 1, "ZhangSan");     DictionaryExtensionMethodClass.TryAdd(dict, 2, "WangWu");     DictionaryExtensionMethodClass.AddOrPeplace(dict, 3, "WangWu");     DictionaryExtensionMethodClass.AddOrPeplace(dict, 3, "ZhangWu");     DictionaryExtensionMethodClass.TryAdd(dict, 2, "LiSi");      //2)TryAdd 和 AddOrReplace 这两个方法具有较强自我描述能力，用起来很省心，而且也简单：     dict.AddOrPeplace(20, "Orange");     dict.TryAdd(21, "Banana");     dict.TryAdd(22, "apple");      //3)像Linq或jQuery一样连起来写        dict.TryAdd(10, "Bob")         .TryAdd(11, "Tom")         .AddOrPeplace(12, "Jom");      //4) 获取值     String F = "Ba";     dict.TryGetValue(31, out F);     Console.WriteLine("F : {0}",F);      foreach (var dic in dict)     {         Console.WriteLine("Output : Key : {0}, Value : {1}", dic.Key, dic.Value);     }     //5)下面是使用GetValue获取值     var v1 = dict.GetValue(111,null);     var v2 = dict.GetValue(10,"abc");      //6)批量添加     var dict1 = new Dictionary<int,int>();     dict1.AddOrPeplace(3, 3);     dict1.AddOrPeplace(5, 5);      var dict2 = new Dictionary<int, int>();     dict2.AddOrPeplace(1, 1);     dict2.AddOrPeplace(4, 4);     dict2.AddRange(dict1, false); }　　扩展方法所在的类public static class DictionaryExtensionMethodClass {    /// <summary>    /// 尝试将键和值添加到字典中：如果不存在，才添加；存在，不添加也不抛导常    /// </summary>    public static Dictionary<TKey, TValue> TryAdd<TKey, TValue>(this Dictionary<TKey, TValue> dict, TKey key, TValue value)    {        if (dict.ContainsKey(key) == false)            dict.Add(key, value);        return dict;    }     /// <summary>    /// 将键和值添加或替换到字典中：如果不存在，则添加；存在，则替换    /// </summary>    public static Dictionary<TKey, TValue> AddOrPeplace<TKey, TValue>(this Dictionary<TKey, TValue> dict, TKey key, TValue value)    {        dict[key] = value;        return dict;    }     /// <summary>    /// 获取与指定的键相关联的值，如果没有则返回输入的默认值    /// </summary>    public static TValue GetValue<TKey, TValue>(this Dictionary<TKey, TValue> dict, TKey key, TValue defaultValue)    {        return dict.ContainsKey(key)?dict[key] : defaultValue;    }     /// <summary>    /// 向字典中批量添加键值对    /// </summary>    /// <param name="replaceExisted">如果已存在，是否替换</param>    public static Dictionary<TKey, TValue> AddRange<TKey, TValue>(this Dictionary<TKey, TValue> dict, IEnumerable<KeyValuePair<TKey, TValue>> values, bool replaceExisted)    {        foreach (var item in values)        {            if (dict.ContainsKey(item.Key) == false || replaceExisted)                dict[item.Key] = item.Value;        }        return dict;    }  }

//定义    Dictionary<string, string> openWith = new Dictionary<string, string>();     //添加元素    openWith.Add("txt", "notepad.exe");    openWith.Add("bmp", "paint.exe");    openWith.Add("dib", "paint.exe");    openWith.Add("rtf", "wordpad.exe");     //取值    Console.WriteLine("For key = \"rtf\", value = http://www.mamicode.com/{0}.", openWith["rtf"]);     //更改值    openWith["rtf"] = "winword.exe";    Console.WriteLine("For key = \"rtf\", value = http://www.mamicode.com/{0}.", openWith["rtf"]);     //遍历key    foreach (string key in openWith.Keys)    {        Console.WriteLine("Key = {0}", key);    } 复制代码    //遍历value    foreach (string value in openWith.Values)    {        Console.WriteLine("value = http://www.mamicode.com/{0}", value);    }    //遍历value, Second Method    Dictionary<string, string>.ValueCollection valueColl = openWith.Values;    foreach (string s in valueColl)    {        Console.WriteLine("Second Method, Value = http://www.mamicode.com/{0}", s);    }复制代码     //遍历字典    foreach (KeyValuePair<string, string> kvp in openWith)    {        Console.WriteLine("Key = {0}, Value = http://www.mamicode.com/{1}", kvp.Key, kvp.Value);    } 复制代码    //添加存在的元素    try    {        openWith.Add("txt", "winword.exe");    }    catch (ArgumentException)    {        Console.WriteLine("An element with Key = \"txt\" already exists.");    }复制代码     //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.");    }

//可以添加任何类型Dictionary<int,List<string>> DicObj = new Dictionary<int,List<string>>();