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[ASP.net教程]c#判断是否为合法的email地址


题目要求:

class Program  {    static void Main(string[] args)    {      Console.WriteLine("请输入正确的邮箱地址,以 @sina.com 结尾");      string us =Convert.ToString(Console.ReadLine());      string str1 = us.Replace("@", "");      int count = us.Length - str1.Length;      string str2 = us.Replace(".", "");      int count2 = us.Length - str2.Length;      int count3 = us.Length - 1;      int xl=us.IndexOf(".")-us.IndexOf("@");      bool mw = (us.IndexOf("@sina.com") == (us.Length-9));      while (count == 1 && count2 == 1 && us.IndexOf("@") > 0 && us.IndexOf(".") > us.IndexOf("@")         && us.IndexOf(".")<count3)      {        if (xl != 1 && us.Contains("@sina.com") && mw)        {          Console.WriteLine("正确");        }        else {          Console.WriteLine("输入的邮箱地址有误");        }        break;      }      Console.ReadLine();    }  }

2016 - 07 - 20