C# Dictionary 终极使用方法

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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文章标签： dictionary c# string class

本文通过三个示例介绍了C#中Dictionary类的基本用法：包括如何创建、添加元素、判断键是否存在、遍历键值对等；展示了不同类型参数的应用场景；并通过自定义类作为值类型扩展了字典的功能。

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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; } }