Dictionary的用法

 Dictionary常用用法：以 key 的类型为 int , value的类型为string 为例

 1、创建及初始化

 Dictionary<int,string>myDictionary=newDictionary<int,string>();

 2、添加元素

myDictionary.Add(1,"C#");

myDictionary.Add(2,"C++");

myDictionary.Add(3,"ASP.NET");

myDictionary.Add(4,"MVC");

 3、通过Key查找元素

if(myDictionary.ContainsKey(1))

{

Console.WriteLine("Key:{0},Value:{1}","1", myDictionary[1]);

 }

 4、通过KeyValuePair遍历元素

foreach(KeyValuePair<int,string>kvp in myDictionary)

...{

Console.WriteLine("Key = {0}, Value = {1}",kvp.Key, kvp.Value);

}

5、仅遍历键 Keys 属性

Dictionary<int,string>.KeyCollection keyCol=myDictionary.Keys;

foreach(intkeyinkeyCol)

...{

Console.WriteLine("Key = {0}", key);

}

6、仅遍历值 Valus属性

Dictionary<int,string>.ValueCollection valueCol=myDictionary.Values;

foreach(stringvalueinvalueCol)

...{

Console.WriteLine("Value = {0}", value);

}

7、通过Remove方法移除指定的键值

myDictionary.Remove(1);

if(myDictionary.ContainsKey(1))

...{

　　Console.WriteLine("Key:{0},Value:{1}","1", myDictionary[1]);

}

else

{

Console.WriteLine("不存在 Key : 1"); 

 }