統計多字符出現次數

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            a();
        }
        public static int a()
        {
            string ab;
            string full = "aaabbbcaaa";
            Hashtable stringTime = new Hashtable();
            for (int i = 0; i < full.Length-1; i++)
            {

                int k = 0;
                 ab = full.Substring(i, 2);
                for (int j = 0; j < full.Length-1; j++)
                {
                    string cAb = full.Substring(j, 2);
                    if (ab.Equals(cAb))
                    {
                        k++;
                    }
                }
                if (!stringTime.ContainsKey(ab))
                {
                    stringTime.Add(ab, k);
                }
            }
            return 0;
        }

    }
}