C#——生成随机数

 

       
         最多生成8位，字节数组长度是16，否则就会超出数组界限

         public static string GenerateUniqueText(int num)
        {
            string randomResult = string.Empty;
            string readyStr = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
            char[] rtn = new char[num];
            Guid gid = Guid.NewGuid();
            var ba = gid.ToByteArray();
            for (var i = 0; i < num; i++)
            {
                rtn[i] = readyStr[((ba[i] + ba[num + i]) % 35)];
            }

            foreach (char r in rtn)
            {
                randomResult += r;
            }

            return randomResult;
        }