c# 随机字符串的生成

方法一：随机生成不重复数字字符串  
private int rep=0;

       /// 
       /// 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)
       {
           string str = string.Empty;
           long num2 = DateTime.Now.Ticks + this.rep;
           this.rep++;
           Random random = new Random(((int)(((ulong)num2) & 0xffffffffL)) | ((int)(num2 >> this.rep)));
           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)
       {
           string str = string.Empty;
           long num2 = DateTime.Now.Ticks + this.rep;
           this.rep++;
           Random random = new Random(((int)(((ulong)num2) & 0xffffffffL)) | ((int)(num2 >> this.rep)));
           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;
       }

方法三、
 private static char[] constant =   
      {   
        '0','1','2','3','4','5','6','7','8','9',  
        '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',   
        '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'   
      };
        public static string GenerateRandomNumber(int Length)
        {
            System.Text.StringBuilder newRandom = new System.Text.StringBuilder(62);
            Random rd = new Random();
            for (int i = 0; i < Length; i++)
            {
                newRandom.Append(constant[rd.Next(62)]);
            }
            return newRandom.ToString();
        }

方法四、
 Random ran = new Random();
for(int i=0;i<10;i++)
{
 int RandKey = ran.Next(100000000, 999999999);
}

方法五、
Console.WriteLine(Guid.NewGuid().ToString());

方法六、

for (int i = 0; i < 10; i++)

{

    RNGCryptoServiceProvider csp = new RNGCryptoServiceProvider()

    byte[] byteCsp = new byte[10];

    csp.GetBytes(byteCsp);

    Console.WriteLine(BitConverter.ToString(byteCsp));

}