1、命名空间:
System.Collections.Generic(程序集:mscorlib)2、描述: 1)、从一组键(Key)到一组值(Value)的映射,每一个添加项都是由一个值及其相关连的键组成 2)、任何键都必须是唯一的 3)、键不能为空引用null(VB中的Nothing),若值为引用类型,则可以为空值 4)、Key和Value可以是任何类型(string,int,custom class 等)3、创建及初始化: Dictionary<int, string> myDictionary = new Dictionary<int, string>();4、添加元素: myDictionary.Add("C#",0); myDictionary.Add("C++",1); myDictionary.Add("C",2); myDictionary.Add("VB",2);5、查找元素By Key: if(myDictionary.ContainsKey("C#")) { Console.WriteLine("Key:{0},Value:{1}", "C#", myDictionary["C#"]); }6.遍历元素 By KeyValuePair foreach (KeyValuePair<string, int> kvp in myDictionary) { Console.WriteLine("Key = {0}, Value = {1}",kvp.Key, kvp.Value); }7、仅遍历键 By Keys 属性: Dictionary<string, int>.KeyCollection keyCol = myDictionary.Keys; foreach (string key in keyCol/*string key in myDictionary.Keys*/) { Console.WriteLine("Key = {0}", key); }8、仅遍历值By Valus属性: Dictionary<string, int>.ValueCollection valueCol = myDictionary.Values; foreach (int value in valueCol) { Console.WriteLine("Value = {0}", value); }9.移除指定的键值By Remove方法: myDictionary.Remove("C#"); if (myDictionary.ContainsKey("C#")) { Console.WriteLine("Key:{0},Value:{1}", "C#", myDictionary["C#"]); } else { Console.WriteLine("不存在 Key : C#");