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根据SQL Server排序规则创建顺序GUID
public static class GuidUtil { private static readonly long EpochMilliseconds = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc).Ticks / 10000L; /// <summary> /// Creates a sequential GUID according to SQL Server‘s ordering rules. /// </summary> public static Guid NewSequentialId() { // This code was not reviewed to guarantee uniqueness under most conditions, nor completely optimize for avoiding // page splits in SQL Server when doing inserts from multiple hosts, so do not re-use in production systems. var guidBytes = Guid.NewGuid().ToByteArray(); // get the milliseconds since Jan 1 1970 byte[] sequential = BitConverter.GetBytes((DateTime.Now.Ticks / 10000L) - EpochMilliseconds); // discard the 2 most significant bytes, as we only care about the milliseconds increasing, but the highest ones // should be 0 for several thousand years to come (non-issue). if (BitConverter.IsLittleEndian) { guidBytes[10] = sequential[5]; guidBytes[11] = sequential[4]; guidBytes[12] = sequential[3]; guidBytes[13] = sequential[2]; guidBytes[14] = sequential[1]; guidBytes[15] = sequential[0]; } else { Buffer.BlockCopy(sequential, 2, guidBytes, 10, 6); } return new Guid(guidBytes); } }
根据SQL Server排序规则创建顺序GUID
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