public static class RandomHelper
    {
        /// <summary>
        /// 隨機(jī)數(shù)生成器
        /// </summary>
        public static Random Generator { get; } = new Random(SystemRandomInt());

        /// <summary>
        /// 使用RNGCryptoServiceProvider生成真正隨機(jī)的二進(jìn)制數(shù)據(jù)
        /// </summary>
        public static byte[] SystemRandomBytes()
        {
            byte[] bytes = System.Guid.NewGuid().ToByteArray();
            return bytes;
        }

        /// <summary>
        /// 使用RNGCryptoServiceProvider生成真正隨機(jī)的整數(shù)
        /// </summary>
        public static int SystemRandomInt()
        {
            return BitConverter.ToInt32(SystemRandomBytes(), 0);
        }



        /// <summary>
        /// 生成10位數(shù)的編號
        /// </summary>
        public static string GenerateSerial()
        {
            //把guid轉(zhuǎn)換為兩個long int
            byte[] bytes = System.Guid.NewGuid().ToByteArray();
            UInt64 high = System.BitConverter.ToUInt64(bytes, 0);
            UInt64 low = System.BitConverter.ToUInt64(bytes, 8);
            //轉(zhuǎn)換為10位數(shù)字
            UInt64 mixed = ((high ^ low) % 8999999999) + 1000000000;
            return mixed.ToString();
        }

        public static string GenerateOrderId()
        {
            long id = DateTime.Now.Ticks - DateTime.Parse("2017/01/01").Ticks;
            return id.ToString("D10");
        }

        /// <summary>
        /// 生成隨機(jī)字符串
        /// </summary>
        /// <param name="length">字符串長度</param>
        /// <param name="chars">包含的字符，默認(rèn)是a-zA-Z0-9</param>
        /// <returns></returns>

        public static string RandomString(int length, string chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
        {
            var buffer = new char[length];
            for (int n = 0; n < length; ++n)
            {
                buffer[n] = chars[Generator.Next(chars.Length)];
            }
            return new string(buffer);
        }
    }

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