/// <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($"Current year can't be greater than {MaxYear}");
}
// 使用31进制计算，值不会超过3个字节
int td = now.Year * 31 * 31 + now.Month * 31 + now.Day;
// 4个字节，最后一个字节为0
byte[] bs4 = BitConverter.GetBytes(td);
// 取3个非0字节
byte[] bs3 = new byte[3];
Array.Copy(bs4, bs3, 3);
// 年月日部分编码后，5个字符
string ymd = OrderBase32.ToBase32(bs3);
// 小时部分
char h = NumberCharDic[now.Hour];
// Guid部分，26个字符
string guid = OrderBase32.ToBase32(Guid.NewGuid().ToByteArray());
StringBuilder sb = new StringBuilder(32);
sb.Append(ymd).Append(h).Append(guid);
return(sb.ToString());
}
/// <summary>
/// 生成全局唯一32位字符串Id
/// </summary>
/// <returns></returns>
public static string NewId2()
{
DateTime now = DateTime.Now;
if (now.Year > MaxYear)
{
throw new InvalidOperationException($"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());
}
