C# Dictionary 终极使用方法

代码

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; }

}