Dictionary<key,value>详解

１.声明：分别有key与value组合,value可以是一个类，对数，数组类型，数据表

Dictionary<String, String> pList = new Dictionary<String, String>();

２.查找是否包含key值

if(pList.ContainsKey("Item1") == false){//列表未包含item1的键值，新增key值

　　pList.add("item1","zhengjing");

}

3.//判断是否存在相应的key并显示

    if (pList.ContainsKey("Item1"))

    {

        Console.WriteLine("Output: " + pList["Item1"]);　或pList.Item1

    }

４.遍历方法　

//遍历Key

    foreach (var key in pList.Keys)

    {

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

    }

 

    //遍历Value

    foreach (String value in pList.Values)

    {

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

    }

    //遍历Key和Value

    foreach (var dic in pList)

    {

        Console.WriteLine("Output Key : {0}, Value : {1} ", dic.Key, dic.Value);

    }

　　//遍历Key和Value

　　foreach(KeyValuePair<string,string> kv in list)
　　{
　　　　Console.WriteLine(kv.Key+kv.Value);
　　}

５.数组

/// <summary>

/// Dictionary的Value为一个数组

/// </summary>

 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]);

 }

6.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);

     }

 }

 

public class Student
{
public String Num { get; set; }
public String Name { get; set; }
}