public TimeSpan(TimePoint s, TimePoint e)
{
if (s > e)
{
throw new Exception("TimeSpan构造错误，TimeSpan只支持同一天的一个时间段，并且开始时间点不能大于结束时间点。");
}
_tpPair = new Pair <TimePoint, TimePoint>(s, e);
}
/// <summary>
/// 时间是否落在时间段内
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public bool IsTimeInSpan(DateTime dt)
{
TimePoint tempTP = new TimePoint(dt.Hour, dt.Minute);
return(tempTP >= TimeBegin && tempTP <= TimeEnd);
}