生成随机字符串代码,CSharp代码库,德仔网

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【CSharp】生成随机字符串
作者:dezai / 发布于2014/5/16/ 484
///<summary>
    ///生成随机字符串
    ///</summary>
    ///<param name="length">目标字符串的长度</param>
    ///<param name="useNum">是否包含数字，1=包含，默认为包含</param>
    ///<param name="useLow">是否包含小写字母，1=包含，默认为包含</param>
    ///<param name="useUpp">是否包含大写字母，1=包含，默认为包含</param>
    ///<param name="useSpe">是否包含特殊字符，1=包含，默认为不包含</param>
    ///<param name="custom">要包含的自定义字符，直接输入要包含的字符列表</param>
    ///<returns>指定长度的随机字符串</returns>
    public string GetRnd(int length, bool useNum, bool useLow, bool useUpp, bool useSpe, string custom)
    {
      byte[] b = new byte[4];
      new System.Security.Cryptography.RNGCryptoServiceProvider().GetBytes(b);
      Random r = new Random(BitConverter.ToInt32(b, 0));
      string s = null, str = custom;
      if (useNum == true) { str += "0123456789"; }
      if (useLow == true) { str += "abcdefghijklmnopqrstuvwxyz"; }
      if (useUpp == true) { str += "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; }
      if (useSpe == true) { str += "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~"; }
      for (int i = 0; i < length; i++)
      {
        s += str.Substring(r.Next(0, str.Length - 1), 1);
      }
      return s;
    }

    ///<summary>
    ///得到随机字符.
    ///</summary>
    ///<param name="intLength">Length of the int.</param>
    ///<param name="booNumber">if set to <c>true</c> [boo number].</param>
    ///<param name="booSign">if set to <c>true</c> [boo sign].</param>
    ///<param name="booSmallword">if set to <c>true</c> [boo smallword].</param>
    ///<param name="booBigword">if set to <c>true</c> [boo bigword].</param>
    ///<returns></returns>
    public string getRandomizer(int intLength, bool booNumber, bool booSign, bool booSmallword, bool booBigword)
    {
      //定义
      Random ranA = new Random();
      int intResultRound = 0;
      int intA = 0;
      string strB = "";
      while (intResultRound < intLength)
      {
        //生成随机数A，表示生成类型
        //1=数字，2=符号，3=小写字母，4=大写字母
        intA = ranA.Next(1, 5);
        //如果随机数A=1，则运行生成数字
        //生成随机数A，范围在0-10
        //把随机数A，转成字符
        //生成完，位数+1，字符串累加，结束本次循环
        if (intA == 1 && booNumber)
        {
          intA = ranA.Next(0, 10);
          strB = intA.ToString() + strB;
          intResultRound = intResultRound + 1;
          continue;
        }
        //如果随机数A=2，则运行生成符号
        //生成随机数A，表示生成值域
        //1：33-47值域，2：58-64值域，3：91-96值域，4：123-126值域
        if (intA == 2 && booSign == true)
        {
          intA = ranA.Next(1, 5);
          //如果A=1
          //生成随机数A，33-47的Ascii码
          //把随机数A，转成字符
          //生成完，位数+1，字符串累加，结束本次循环
          if (intA == 1)
          {
            intA = ranA.Next(33, 48);
            strB = ((char)intA).ToString() + strB;
            intResultRound = intResultRound + 1;
            continue;
          }

          //如果A=2
          //生成随机数A，58-64的Ascii码
          //把随机数A，转成字符
          //生成完，位数+1，字符串累加，结束本次循环
          if (intA == 2)
          {
            intA = ranA.Next(58, 65);
            strB = ((char)intA).ToString() + strB;
            intResultRound = intResultRound + 1;
            continue;
          }

          //如果A=3
          //生成随机数A，91-96的Ascii码
          //把随机数A，转成字符
          //生成完，位数+1，字符串累加，结束本次循环
          if (intA == 3)
          {
            intA = ranA.Next(91, 97);
            strB = ((char)intA).ToString() + strB;
            intResultRound = intResultRound + 1;
            continue;
          }

          //如果A=4
          //生成随机数A，123-126的Ascii码
          //把随机数A，转成字符
          //生成完，位数+1，字符串累加，结束本次循环
          if (intA == 4)
          {
            intA = ranA.Next(123, 127);
            strB = ((char)intA).ToString() + strB;
            intResultRound = intResultRound + 1;
            continue;
          }
        }

        //如果随机数A=3，则运行生成小写字母
        //生成随机数A，范围在97-122
        //把随机数A，转成字符
        //生成完，位数+1，字符串累加，结束本次循环
        if (intA == 3 && booSmallword == true)
        {
          intA = ranA.Next(97, 123);
          strB = ((char)intA).ToString() + strB;
          intResultRound = intResultRound + 1;
          continue;
        }

        //如果随机数A=4，则运行生成大写字母
        //生成随机数A，范围在65-90
        //把随机数A，转成字符
        //生成完，位数+1，字符串累加，结束本次循环
        if (intA == 4 && booBigword == true)
        {
          intA = ranA.Next(65, 89);
          strB = ((char)intA).ToString() + strB;
          intResultRound = intResultRound + 1;
          continue;
        }
      }
      return strB;
    }
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　随机字符串　
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