防止程序过快生成相同随机数

        static int GetRandomSeed()

        {

            byte[] bytes = new byte[4];

            System.Security.Cryptography.RNGCryptoServiceProvider rng = new System.Security.Cryptography.RNGCryptoServiceProvider();

            rng.GetBytes(bytes);

            return BitConverter.ToInt32(bytes, 0);

        }

 

 

Random random = new Random(GetRandomSeed());

string ran = random.Next(10000000, 99999999).ToString();