asp.net求3位不同数字的组合数


            简单的： 复制代码 代码如下:public partial class _Default : System.Web.UI.Page   {      string m1 = "";      protected void Page_Load(object sender, EventArgs e)      {          string n = "123";          string m = "";          zuhe(n);          for (int j = 2; j > -1; j--)          {              m = m + n[j];          }          zuhe(m);      }       private void zuhe(string ssel)      {          for (int i = 0; i < ssel.Length; i++)          {              m1 = ssel + ssel.Substring(i, 1);              Response.Write(m1.Remove(i,1) + "<br>");          }      }  } CSDN的（xiaoshen1127 ）：WINFORM版 复制代码 代码如下:using System; using System.Collections.Generic; namespace ZuHeShu {     class Program     {         static void Main(string[] args)         {             Program p = new Program();             Console.WriteLine("******************************组合数***********************************");             Console.WriteLine("请任意输入一个整数:");             string num = Console.ReadLine();             try {                 long.Parse(num);                 List<string> als = new List<string>();                 als = p.GetData(string.Empty, num.Trim(), als);                 p.Display(als);                 Console.WriteLine("\nY-Enter:继续");                 if (Console.ReadLine().Trim().ToLower() == "y")                 {                     Console.Clear();                     Main(args);                 }             }             catch {                 Console.Clear();                 Console.WriteLine("请输入数字！");                 Main(args);             }         }         private List<string> GetData(String strBase, String strSel, List<string> alRet)         {             if (strSel.Length == 1)             {                 string temp=strBase + strSel;                 if (!alRet.Contains(temp)&&!temp.StartsWith("0"))                 {                     alRet.Add(temp);                 }             }             else             {                 for (int i = 0; i < strSel.Length; i++)                 {                     GetData(strBase + strSel.Substring(i, 1), strSel.Remove(i, 1), alRet);                 }             }             return alRet;         }         public void Display(List<string> dals)         {             int i = 1;             int a = dals.Count;             if (a == 0)             {                 Console.WriteLine("该数没有其他组合情况");             }             else             {                 Console.WriteLine("不同的组合数共有" + a + "个，如下");                 foreach (string number in dals)                 {                     Console.Write(number + "\t");                     if (i++ % 5 == 0)                     {                         Console.WriteLine();                     }                 }             }         }     } }