Ejemplo n.º 1
0
        /// <summary>
        /// 生成全局唯一32位字符串Id
        /// </summary>
        /// <returns></returns>
        public static string NewId()
        {
            DateTime now = DateTime.Now;

            if (now.Year > MaxYear)
            {
                throw new InvalidOperationException($"Current year can't be greater than {MaxYear}");
            }
            // 使用31进制计算,值不会超过3个字节
            int td = now.Year * 31 * 31 + now.Month * 31 + now.Day;

            // 4个字节,最后一个字节为0
            byte[] bs4 = BitConverter.GetBytes(td);
            // 取3个非0字节
            byte[] bs3 = new byte[3];
            Array.Copy(bs4, bs3, 3);
            // 年月日部分编码后,5个字符
            string ymd = OrderBase32.ToBase32(bs3);
            // 小时部分
            char h = NumberCharDic[now.Hour];
            // Guid部分,26个字符
            string guid = OrderBase32.ToBase32(Guid.NewGuid().ToByteArray());

            StringBuilder sb = new StringBuilder(32);

            sb.Append(ymd).Append(h).Append(guid);

            return(sb.ToString());
        }
Ejemplo n.º 2
0
        /// <summary>
        /// 生成全局唯一32位字符串Id
        /// </summary>
        /// <returns></returns>
        public static string NewId2()
        {
            DateTime now = DateTime.Now;

            if (now.Year > MaxYear)
            {
                throw new InvalidOperationException($"Current year can't be greater than {9999}");
            }
            // 4个字符
            string year  = now.Year.ToString().PadLeft(4, '0');
            char   month = NumberCharDic[now.Month];
            char   day   = NumberCharDic[now.Day];
            // Guid部分,26个字符
            string        guid = OrderBase32.ToBase32(Guid.NewGuid().ToByteArray());
            StringBuilder sb   = new StringBuilder(32);

            sb.Append(year).Append(month).Append(day).Append(guid);
            return(sb.ToString());
        }