Dictionary（数据字典）

数据字典：Dictionary对象用于在结对的名称/值中存储信息（等同于键和项目），其可作为传参使用。

C# Dictionary字典类的使用方法

//定义字典                Dictionary
    
      d = new Dictionary
     
      ();                //添加字典的元素                for (int i = 0; i < 5; i++)                {                    d.Add("key" + i, "value" + i);                }                //取值/赋值                string val = d["key1"];                d["key1"] = "new value";                //遍历key                foreach (string key in d.Keys)                {                    Console.WriteLine("Key = {0}", key);                }                //遍历value                foreach (string v in d.Values)                {                    Console.WriteLine("value = {0}", v);                }                //遍历value, Second Method                Dictionary
      
       .ValueCollection valueColl = d.Values;                foreach (string s in valueColl)                {                    Console.WriteLine("Second Method, Value = {0}", s);                }                //遍历字典                foreach (KeyValuePair
       
         kvp in d)                {                    Console.WriteLine("Key = {0}, Value = {1}", kvp.Key, kvp.Value);                }                //删除元素                d.Remove("key1");                if (!d.ContainsKey("key1"))                {                    Console.WriteLine("Key \"key1\" is not found.");                }                //判断键存在                if (d.ContainsKey("key1")) // True                 {                    Console.WriteLine("An element with Key = \"key1\" exists.");                }