C # create a unique order number. Considering the time,

C # create a unique order number. Considering the time,

 

We mainly want to consider the date and other factors.

 

Use the RNGCryptoServiceProvider class to create a unique maximum of 8-digit string.

 

        private static string GetUniqueKey()        {            int maxSize = 8;            int minSize = 5;            char[] chars = new char[62];            string a;            a = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";            chars = a.ToCharArray();            int size = maxSize;            byte[] data = new byte[1];            RNGCryptoServiceProvider crypto = new RNGCryptoServiceProvider();            crypto.GetNonZeroBytes(data);            size = maxSize;            data = new byte[size];            crypto.GetNonZeroBytes(data);            StringBuilder result = new StringBuilder(size);            foreach (byte b in data)            {                result.Append(chars[b % (chars.Length - 1)]);            }            return result.ToString();        }

 

Then,

 

            for(int i = 0; i < 10; i++)            {                string str = string.Format("{0}{1}", DateTime.Now.ToString("yyyyMMddHHmmss"), GetUniqueKey());                Console.WriteLine(str);            }            Console.ReadKey();