public void StartRepeatDownload()
{
//为了预留一定的误差冗余，特意把触发间隔时间设为 60.5 秒而不是 60 秒。
RepeatInfo infoNext = new RepeatInfo(DefaultNextMinute0SecondCalculator, TimeSpan.FromSeconds(60.5));
//为了预留一定的误差冗余，特意把触发间隔时间设为 60.5 秒而不是 60 秒。
RepeatInfo infoCurrent = new RepeatInfo(TimeSpan.FromSeconds(0), DefaultNextMinute0SecondCalculator);
#region 测试之用：
////1
//RepeatInfo infoNext = new RepeatInfo(TimeSpan.FromMinutes(15), TimeSpan.FromMinutes(15));
//RepeatInfo infoCurrent = new RepeatInfo(TimeSpan.FromSeconds(0), TimeSpan.FromMinutes(15));
////2
//RepeatInfo infoNext = new RepeatInfo(DefaultNextMinute0SecondCalculator, TimeSpan.FromSeconds(60));
//RepeatInfo infoCurrent = new RepeatInfo(TimeSpan.FromSeconds(0), DefaultNextMinute0SecondCalculator);
#endregion
downloadTimer = new Timer(RepeatDownloadData, infoNext, infoCurrent.DueTime, infoCurrent.Period);
}
private void RepeatDownloadData(object repeatInfo)
{
if (repeatInfo == null || (false == repeatInfo is RepeatInfo))
{
throw new ArgumentException("参数 repeatInfo 为 null 或不是 RepeatInfo 类型的实例！", "repeatInfo");
}
RepeatInfo info = repeatInfo as RepeatInfo;
List <SourceData> data = DataDownloader.DownloadData();
bool isSuccess = CombineSourceData(data);
//如果合并不成功（即：data 数据为空或者没有最新这一分钟的数据），则把触发时间改为 1 秒之后，即 1 秒后重新触发下载操作。
if (false == isSuccess)
{
info.Change(TimeSpan.FromSeconds(1), DefaultNextMinute0SecondCalculator);
}
//否则，如果合并成功，则把触发时间设为正常的 “在下一分钟开始”。
else
{
info.Change(DefaultNextMinute0SecondCalculator, TimeSpan.FromSeconds(60.5));
}
info.ChangeTimer(downloadTimer); //通过 RepeatInfo 对象的参数来更新 Timer 对象的触发参数。
//上面的这个 “info.ChangeTimer(downloadTimer);” 写法替代了下面的这种。
//downloadTimer.Change(info.DueTime, info.Period);
}
public void ChangeTimerState(TimeSpan dueTime, TimeSpan period)
{
RepeatInfo info = new RepeatInfo(dueTime, period);
info.ChangeTimer(downloadTimer);
}