public static Guid Create(DateTime secureTimestamp, SequentialGuidTypes type)
{
byte[] randomBytes = new byte[10];
RandomGenerator.GetBytes(randomBytes);
long timestamp = secureTimestamp.Ticks / 1_000L;
byte[] timestampBytes = BitConverter.GetBytes(timestamp);
BitConverter.IsLittleEndian.IfTrue(timestampBytes.Reverse);
byte[] guidBytes = new byte[16];
switch (type)
{
case SequentialGuidTypes.SequentialAsString:
case SequentialGuidTypes.SequentialAsBinary:
timestampBytes.BlockCopy(2, guidBytes, 0, 0);
randomBytes.BlockCopy(0, guidBytes, 6, 10);
if (type == SequentialGuidTypes.SequentialAsString && BitConverter.IsLittleEndian)
{
guidBytes.Reverse(0, 4);
guidBytes.Reverse(4, 2);
}
break;
case SequentialGuidTypes.SequentialAsEnd:
randomBytes.BlockCopy(0, guidBytes, 0, 10);
timestampBytes.BlockCopy(2, guidBytes, 10, 6);
break;
}
return(new Guid(guidBytes));
}
public static Guid Create(SequentialGuidTypes type, NoRepeatMode mode) => Create(mode == NoRepeatMode.On ? NoRepeatTimeStampManager.GetFactory().GetUtcTimeStamp() : DateTime.UtcNow, type);
public static Guid Create(SequentialGuidTypes type) => Create(DateTime.UtcNow, type);
