C#生成用户密码(发帖挨砸记)

前几天使用随机函数写了一个生成密码的程序，沾沾自喜之余发到论坛上，被人一顿猛砸。原来还有更简单的方法：Guid.NewGuid生成随机密码。

 

下面是链接：http://topic.csdn.net/u/20101119/02/b39eec84-728c-4a03-b9b1-ff9285cd1a62.html

 

下面是原文：

 

如果用户的密码丢失了，网站通常生成一个新的密码发到他的邮箱。我试着写了一个，请各位批评指正！

输入的参数是：level复杂程度，length密码长度。

其中密码复杂程度分为6级：0数字，1小写字母，2数字加小写字母，3数字加大小写字母，4加特殊字符，5更多特殊字符。

在一个Winform里放置一个按钮，三个文本框（一个为显示结果，两个为输入参数）。

  private void button1_Click(object sender, EventArgs e)
  {
  int level =Convert.ToInt32(this.textBox2.Text);
  int length = Convert.ToInt32(this.textBox3.Text);
  this.textBox1.Text = GeneratePWD(level, length);
  }
  /// <summary>
  /// Generate password for new user
  /// </summary>
  /// <param name="level">0 = digits only</param>
  /// <param name="level">1 = lowercase alphabets only</param>
  /// <param name="level">2 = num+lowercase</param>
  /// <param name="level">3 = num+lowercase+uppercase</param>
  /// <param name="level">4 = num+lowercase+uppercase+special characters(!@#$%&)</param>
  /// <param name="level">5 = more special characters</param>
  /// <param name="length">Length of password: from 3 to 12</param>
  /// <returns></returns>
  private string GeneratePWD(int level, int length)
  {
  int beginPosition = 0;
  int endPosition = 100;

  if (length < 3 || length > 12) length = 8;
  switch (level)
  {
  case 0:
  endPosition = 37;
  break;
  case 1:
  beginPosition = 38;
  endPosition = 63;
  break;
  case 2:
  endPosition = 63;
  break;
  case 3:
  endPosition = 89;
  break;
  case 4:
  endPosition = 100;
  break;
  default:
  endPosition = 109;
  break;
  }
  char[] characters ={'0','0','1','1','1','1','2','2','2','2','3','3','3','3','4','4','4','4','5','5','5','5','6','6','6','6','7','7','7','7','8','8','8','8','9','9','9','9', //37
  'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',//63
  'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z',//89
  '!','!','@','@','#','#','$','$','%','%','&',//100
  '^','~','+','-','*','<','>','?','/'};//109

  string result = "";
  Random rnd = new Random();
  for (int i = 0; i <length; i++) 
  {
  int str = rnd.Next(beginPosition,endPosition+1);
  result += characters[str];
  }
  return result;
  }
  }

看msdn上直接把随机数存入数组，也许更方便：
http://msdn.microsoft.com/en-us/library/system.random.aspx