Question

我正在使用IPreUpdateEventListener进行审核。我的解决方案正如Ayende Rahien所说here。像这样：

public bool OnPreUpdate(PreUpdateEvent @event)
{
    var audit = @event.Entity as IHaveAuditInformation;
    if (audit == null)
        return false;

    var time = DateTime.Now;
    var name = WindowsIdentity.GetCurrent().Name;

    Set(@event.Persister, @event.State, "UpdatedAt", time);
    Set(@event.Persister, @event.State, "UpdatedBy", name);

    audit.UpdatedAt = time;
    audit.UpdatedBy = name;

    return false;
}

我的问题是我必须将audit.UpdatedAt = time;设置为在我的实体中具有值，但它会使对象变脏并导致对数据库的更多更新。我需要我的对象中的新值，但不希望重复更新。有什么办法吗？

Answer 1

这不应该导致两次更新;其他事情正在发生。问题可能是数据库UpdatedAt字段分辨率与.NET DateTime.Now分辨率不同。我的代码与您的代码几乎完全相同，但我使用此方法来创建时间戳：

    /// <summary>
    /// Return a DateTime with millisecond resolution to be used as the timestamp. This is needed so that DateTime of an existing instance
    /// will equal one that has been persisted and returned from the database. Without this, the times differ due to different resolutions.
    /// </summary>
    /// <returns></returns>
    private static DateTime GetTime()
    {
        var now = DateTime.Now;
        var ts = new DateTime(now.Year, now.Month, now.Day, now.Hour, now.Minute, now.Second, now.Millisecond, DateTimeKind.Local);
        return ts;
    }

IPreUpdateEventListener使对象变脏

1 个答案: