C# 统计文章中字符的种类和个数 哈希表和字典的使用

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Diagnostics;

namespace Dictionary测试

{

class Program

{

static void Main(string[] args)

{

//Hashtable的使用

Hashtable ht=new Hashtable();

ht.Add(10141303, "丁小未");

ht.Add(10141301, "陈立");

Console.Write("10141301学号对应的同学"+ht[10141301]+"\n");

//遍历Hashtable

foreach(DictionaryEntry de in ht) //fileht为一个Hashtable实例

{

Console.WriteLine(de.Key);//de.Key对应于keyvalue键值对key

Console.WriteLine(de.Value);//de.Key对应于keyvalue键值对value

}

//Dictionary<char, char> dict = new Dictionary<char, char>();

Console.WriteLine("请输入英文：");

string S = Console.ReadLine();

string s=S.ToLower();

Dictionary<char, int> countn = new Dictionary<char, int>();

//countn.Add('a', 0);

//countn.Add('b', 0);

//countn.Add('c', 0);

//countn.Add('d', 0);

//countn.Add('e', 0);

//countn.Add('f', 0);

//countn.Add('g', 0);

//countn.Add('h', 0);

//countn.Add('i', 0);

//countn.Add('j', 0);

//countn.Add('k', 0);

//countn.Add('l', 0);

//countn.Add('m', 0);

//countn.Add('n', 0);

//countn.Add('o', 0);

//countn.Add('p', 0);

//countn.Add('q', 0);

//countn.Add('r', 0);

//countn.Add('s', 0);

//countn.Add('t', 0);

//countn.Add('u', 0);

//countn.Add('v', 0);

//countn.Add('w', 0);

//countn.Add('x', 0);

//countn.Add('y', 0);

//countn.Add('z', 0);

List<char> list = new List<char>();

foreach (char a in s)

{

list.Add(a);

}

foreach (char v in list)

{

//处理标点或者意外字符

if (countn.ContainsKey(v))

{

countn[v]++;

}

else

{

countn.Add(v, 1);

}

}

计算运行时间的函数

Stopwatch wp = new Stopwatch();

wp.Start();

foreach (KeyValuePair<char,int> keyvalue in countn)

{

char a = keyvalue.Key;

int n = keyvalue.Value;

Console.WriteLine(a +" " +n);

}

wp.Stop();

Console.WriteLine(wp.Elapsed);

Console.Read();

}

#region else输出打印泛型数组

/// <sum{mary>

/// 打印 zw += a;输出泛型数组

/// </su}mmary>

/// <param name="yuju">要求输出的泛型</param>

private static void shuchu(List<char> yuju)

{

foreach (char a in yuju)

{

Console.Write(a);

}

}

#endregion

}

}