C# 随机字符串函数

 

C# 随机字符串函数

/// 

       /// 生成随机数字字符串
       /// 
       /// 待生成的位数
       /// 生成的数字字符串
       private string GenerateCheckCodeNum(int codeCount, int seed)
       {
           string str = string.Empty;
           long num2 = DateTime.Now.Ticks + seed;
           this.rep++;
           Random random = new Random(((int)(((ulong)num2) & 0xffffffffL)) | ((int)(num2 >> seed)));
           for (int i = 0; i < codeCount; i++)
           {
               int num = random.Next();
               str = str + ((char)(0x30 + ((ushort)(num % 10)))).ToString();
           }
           return str;
       } 

        方法二：随机生成字符串（数字和字母混和） 

       /// 

       /// 生成随机字母字符串(数字字母混和)
       /// 
       /// 待生成的位数
       /// 生成的字母字符串
       private string GenerateCheckCode(int codeCount, int seed)
       {
           string str = string.Empty;
           long num2 = DateTime.Now.Ticks + seed;
           this.rep++;
           Random random = new Random(((int)(((ulong)num2) & 0xffffffffL)) | ((int)(num2 >> seed)));
           for (int i = 0; i < codeCount; i++)
           {
               char ch;
               int num = random.Next();
               if ((num % 2) == 0)
               {
                   ch = (char)(0x30 + ((ushort)(num % 10)));
               }
               else
               {
                   ch = (char)(0x41 + ((ushort)(num % 0x1a)));
               }
               str = str + ch.ToString();
           }
           return str;
       }

 

from：http://www.cnblogs.com/xiaoyaoju/archive/2013/01/11/2856936.html