public string BuildKey()
{
if (!String.IsNullOrEmpty(_id))
{
return(_id);
}
if (!ShortId.IsShortCode())
{
throw new ArgumentNullException("ShortId can not be null");
}
return(String.Format("{0}_{1}_{2}_{3}_{4}_{5}", Type, ShortId, Year, Month, Day, Hour));
}