面试题：在分布式系统，你能想出来几种生成唯一ID的方案？( 六 )_系统唯一ID是我们在设计一个系统的时候

TimeSpan msecs = now.TimeOfDay;

// Convert to a byte array
// Note that SQL Server is accurate to 1/300th of a
// millisecond so we divide by 3.333333
byte[
daysArray = BitConverter.GetBytes(days.Days);
byte[
msecsArray = BitConverter.GetBytes((long)
(msecs.TotalMilliseconds / 3.333333));

// Reverse the bytes to match SQL Servers ordering
Array.Reverse(daysArray);
Array.Reverse(msecsArray);

// Copy the bytes into the guid
Array.Copy(daysArray daysArray.Length - 2 guidArray
guidArray.Length - 6 2);
Array.Copy(msecsArray msecsArray.Length - 4 guidArray
guidArray.Length - 4 4);

return new Guid(guidArray);