从timetamps名单可观测 [英] Observable from list of timetamps

问题描述

如果我有对象的列表，其中包含一个时间戳 - ？我怎样才能让一个可观察的那场大火事件的时间戳之间的相对时间

If I have a list of objects that contains a timestamp - how can I make an observable that fire events at the relative time between the timestamps?

例如。如果我有三个对象时间戳2014年1月1日10：30，2014年1月1日10:45和2014年1月1日11点30分，我想第一个触发事件，向右走，然后在接下来的15分钟后，和最后一个45后分钟

Eg. if I have three objects with timestamps 2014-01-01 10:30, 2014-01-01 10:45 and 2014-01-01 11:30, I want the first event to fire right away, then the next 15 minutes later, and the last one 45 minutes after that.

我怎么能加快这一进程，使1分钟相当于1秒？因此，第一个事件将触发马上像以前一样，但未来会来15秒后，而不是15分钟，等等。

How can I speed up the process, so that 1 minute equals 1 second? So the first event would fire right away as before, but the next would come 15 seconds later instead of 15 minutes and so on.

推荐答案

很多方法可以做到这一点，我敢肯定，但这里用Observable.Generate安排在特定的时间事件的快速采样。它使用的事件的列表 - 但鉴于它与一个迭代器，你可以很容易地适应其使用其​​它来源：

Lots of ways to do this I'm sure, but here's a quick sample using Observable.Generate to schedule events at a particular time. It uses a list of events - but given it works with an iterator, you can easily adapt it to use another source:

void Main()
{
    var now = DateTime.Now;

    var events = new List<Tuple<DateTime, string>> {
        Tuple.Create(now.AddSeconds(5), "A"),
        Tuple.Create(now.AddSeconds(10), "B"),
        Tuple.Create(now.AddSeconds(15), "C")
    };

    var eventSource = Observable.Generate(
        (IEnumerator<Tuple<DateTime,string>>)events.GetEnumerator(),
        s => s.MoveNext(),
        s => s,
        s => s.Current.Item2, // the data
        s => s.Current.Item1); // the timing

    eventSource.Subscribe(Console.WriteLine);                       
}

此写出A，B和C和5，10和15秒后启动。

This writes out "A", "B" and "C" and 5, 10 and 15 seconds after start-up.

要加速的时候，你可以把围绕着如何安排的时间是除preTED一些逻辑。另一种方法是使用 HistoricalScheduler 。请参阅<一href="http://stackoverflow.com/questions/20969829/advanceable-historical-stream-and-live-stream-in-rx/20975724#20975724">this回答对一些见解。

To speed up time, you can put some logic around how the scheduled time is interpreted. Another way it to use the HistoricalScheduler. See this answer for some insight on that.

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