C# Dictionary 用法

最新推荐文章于 2025-03-15 20:02:24 发布

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最新推荐文章于 2025-03-15 20:02:24 发布

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原文链接：http://www.cnblogs.com/fightLonely/archive/2011/03/07/1973381.html

本文通过三个实例展示了C#中Dictionary类的基本用法，包括不同类型键值对的添加、查询及遍历方法。

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using System;
using System.Collections.Generic;

class DictionaryDemo
{
    static void Main(string[] args)
    {
        DictionaryDemo001();
        Console.ReadLine();

        DictionaryDemo002();
        Console.ReadLine();

        DictionaryDemo003();
        Console.ReadLine();
    }

    /// <summary>
    /// 一般用法
    /// </summary>
    static void DictionaryDemo001()
    {
        Dictionary<int, string> dict = new Dictionary<int, string>();
        dict.Add(1, "111");
        dict.Add(2, "222");

        //判断是否存在相应的key并显示
        if (dict.ContainsKey(2))
        {
            Console.WriteLine(dict[2]);
        }

        //遍历Keys
        foreach (var item in dict.Keys)
        {
            Console.WriteLine("Key:{0}", item);
        }

        //遍历Values
        foreach (var item in dict.Values)
        {
            Console.WriteLine("value:{0}", item);
        }

        //遍历整个字典
        foreach (var item in dict)
        {
            Console.WriteLine("key:{0} value:{1}", item.Key, item.Value);
        }
    }

    /// <summary>
    /// 参数为其它类型
    /// </summary>
    static void DictionaryDemo002()
    {
        Dictionary<string, string[]> dict = new Dictionary<string, string[]>();
        dict.Add("1", "1,11,111".Split(','));
        dict.Add("2", "2,22,222".Split(','));
        Console.WriteLine(dict["2"][2]);
    }

    /// <summary>
    /// 调用自定义类
    /// </summary>
    static void DictionaryDemo003()
    {
        Dictionary<int, yongfa365> dict = new Dictionary<int, yongfa365>();
        for (int i = 0; i < 10; i++)
        {
            yongfa365 y = new yongfa365();
            y.UserCode = i;
            y.UserName = "www.yongfa365.com " + i.ToString();
            dict.Add(i, y);
        }
        foreach (var item in dict)
        {
            Console.WriteLine("{0} One:{1} UserName:{2}", item.Key, item.Value.UserCode, item.Value.UserName);
        }
    }
}

class yongfa365
{
    public int UserCode { get; set; }
    public string UserName { get; set; }