用C#编程:输入一些给定的字符串,统计它们各自出现的次数怎么写啊

补充：求表达式1-2+3-4+...+m的值用C#怎么写，谢谢！

追问：可以写好一点吗 ？我不是很清楚啊！呵呵

答案：正则表达式可以实现.
想了解详细 可以在百度里搜索 C# 正则表达式.
indexof这个方法可以实现
using System;using System.Collections.Generic;using System.Linq;using System.Text;

namespace ConsoleApplication1{    class Program    {        static void Main(string[] args)        {            List<String> record = new List<String>()        {            "Hello","World","This","is","my","first","try","to","say","Hello"        };
            var query = from r in record                                                       group r by r.ToLower() into g                               select new { Count = g.Count(), Value = g.Key };
            foreach (var v in query)            {                Console.WriteLine("Value = {0}, Count = {1}", v.Value, v.Count);            }        }    }}=================================================使用LINQ TO OBJECT，一句话就搞定了附上程序#include <iostream>#include <cstdlib>using namespace std;int main(void)unsigned NumDigit(unsigned n);//我相信这个整数不会超过255位吧 unsigned res = 0; itoa(n, c, 10); for (int i = 0; c[i] != NULL; ++i)  res++; return res;}
用C#编程:输入一些给定的字符串,统计它们各自出现的次数怎么写啊这里有视频教程可以看下 http://www.alisoho.com
using System;
using System.Collections.Generic;
using System.Text;
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int i = 1;
            int sum = 0;
            int m = Convert.ToInt32(Console.ReadLine());
            while (i <= m)
            {
                if (i % 2 == 0)
                {
                    sum -= i;
                }
                else
                {
                    sum += i;
                }
                i++;
            }
         
            Console.WriteLine("{0}", sum);
            Console.Read();
         
           
           
        }
    }
}
CONVERT强制转换成整型
int num=0;
for(int i=1;i<m+1;i++)
{
   if(i%2==0)
     num-=i;
    else
     num+=i;
}
Console.WriteLine(num);
好久没有碰问问了。声望值降的都快没有了。所以楼主定要采纳我为满意哦。谢谢哈。
附上答案吧。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string Str = "AaccdDDeFFeetttee";
            string CapStr = Str.ToUpper();
            List<string> CharTemp = new List<string>();
            for (int i = 0; i < CapStr.Length; i++)
            {
                if (CharTemp.Count == 0)
                {
                    CharTemp.Add(CapStr[i].ToString());
                    continue;
                }
                int count = 0;
                for (int j = 0; j < CharTemp.Count; j++)
                {
                    if (!CapStr[i].ToString().Equals(CharTemp[j].ToString()))
                    {
                        count++;
                    }
                }
                if (count == CharTemp.Count)
                {
                    CharTemp.Add(CapStr[i].ToString());
       &

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