生成随机不重复单号

大郎。

BillNoHelper.GenerateCouponKey();

[AppleScript] 纯文本查看 复制代码

    public class BillNoHelper
    {

        /// <summary>
        ///  防止创建类的实例
        /// </summary>
        private BillNoHelper() { }
        private static readonly object locker = new object();
        private static int _sn = 0;
        /// <summary>
        /// 生成单据编号
        /// </summary>
        /// <returns></returns>
        public static string GenerateId()
        {
            lock (locker)   //lock 关键字可确保当一个线程位于代码的临界区时，另一个线程不会进入该临界区。
            {
                if (_sn == 9999)
                {
                    _sn = 1;
                }
                else
                {
                    _sn++;
                }
                return DateTime.Now.ToString("yyMMddHHmmss") + _sn.ToString().PadLeft(4, '0');
            }
        }
        /// <summary>
        /// 唯一值
        /// </summary>
        /// <returns></returns>
        public static string guid()
        {
            return Guid.NewGuid().ToString().Replace("-", "");
        }
        /// <summary>
        /// GuidExtension
        /// </summary>
        /// <param name="guid"></param>
        /// <returns></returns>
        public static string IsNum(Guid guid)
        {
            var s = guid.ToString();
            var sb = new StringBuilder();
            for (int i = 0; i < s.Length; i++)
            {
                if (Char.IsNumber(s, i))
                {
                    sb.Append(s.Substring(i, 1));
                }
            }
            return sb.ToString();
        }

        #region 生成 Coupon Key 
        private static readonly object locker2 = new object();
        private static int _sn2 = 0;
        /// <summary>
        /// 生成key 12位  字母+数字 
        /// </summary>
        /// <returns></returns>
        public static string GenerateCouponKey()//
        {
            string s;
            lock (locker2)
            {
                if (_sn2 == 9999999)
                {
                    _sn2 = 1;
                }
                else
                {
                    _sn2++;
                }
                s = $"Qq@,.*745u787#$@,.><;'{DateTime.Now.Ticks}{_sn2}";
            }
            return MD5_16(s);

        }
        private static string MD5_16(string p_str)
        {

            System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create();
            byte[] data = System.Text.Encoding.Default.GetBytes(p_str);
            byte[] md5Data = md5.ComputeHash(data);
            string strResult = System.BitConverter.ToString(md5Data, 4, 8);
            md5.Clear();
            strResult = strResult.Replace("-", "").ToUpper();
            return strResult;
        }
        #endregion

    }

花花公子01

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