最后一帖,该如何处理

using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication9{    class Program    {        private int x;        private void Permutation_Solution1(char[] pStr, int begin, int end,int min,int max)        {            int count = 0;            if (begin == end - 1) //只剩一个元素            {                for (int i = x; i < end; i++)                {                    count++;                }                if (count >= min && count <= max)                {                    for (int i = x; i < end; i++) //打印                    {                            Console.Write(pStr[i]);                    }                    Console.WriteLine(string.Empty);                }                       }            else            {                for (int k = begin; k < end; k++)                {                    swap(ref pStr[k], ref pStr[begin]); //交换两个字符                    Permutation_Solution1(pStr, begin + 1, end,min,max);                    swap(ref pStr[k], ref pStr[begin]);  //恢复                }            }        }        private void swap(ref char p1,ref char p2)        {            char c;            c = p1;            p1 = p2;            p2 = c;        }        static void Main(string[] args)        {            string str = "abcde";            char[] c =str.ToCharArray();            Program g = new Program();            int len=str.Length;            Console.WriteLine("请输入min,max（在1和{0}之间）",len );            int min = Convert.ToInt32(Console.ReadLine());            int max = Convert.ToInt32(Console.ReadLine());            for (int i = 0; i < len; i++)            {                for (int j = 0; j < len; j++)                {                    g.x = i;                    g.Permutation_Solution1(c, i, j+1,min ,max);                }            }            Console.ReadKey();        }    }}