System.reactive计时器 - 如何动态更改间隔？

我正在使用System.Reactive开发以下（简化版）类。现在，它每1秒滴答一次，但为了减少CPU的工作量，我想计算我感兴趣的下一个日期时间，并相应地设置一个新的间隔。该新间隔可以与当前设置的间隔不同或不同。这是带注释的类：

I am developing the following (simplified version of) class with System.Reactive. Right now, it ticks every 1 second, but in an effort to reduce workload on the CPU, I want to calculate the next datetime I'm interested in, and set a new interval accordingly. This new interval may or may not be different from the currently set interval. Here's the annotated class:

public class Class1
{
    public IObservable<long> Timer;
    public IDisposable       TimerSub;
    DateTime                 NextTime = new DateTime(0);

    public Class1()
    {
        this.NextTime = new DateTime(0);
        this.Timer    = Observable.Timer(TimeSpan.FromSeconds(1));
        this.TimerSub = this.Timer.Subscribe(x => DoWork());
    }

    private void DoWork()
    {
        bool canWork = (this.NextTime.Ticks != 0);
        this.NextTime = this.CalculateFutureDate();

        // change the timer interval to  "this.NextTime - DateTime.Now"
        // how do I do this?

        if (canWork)
        {
            // Do some work stuff...
        }
    }

    private DateTime CalculateFutureDate()
    {
        return DateTime.Now.AddDays(1);
    }
}

我的尝试：



谷歌搜索，但没有任何结果是有道理的。

What I have tried:

googling, but nothing came up that made any sense.