[英]Cancellation token for observable
How can I cancel the following type of Rx Observable, if the following observable is being created on a StartButton click, ie from a stop button. 如果在StartButton单击上创建以下可观察对象,即从停止按钮创建,则如何取消以下类型的Rx Observable。
var instance = ThreadPoolScheduler.Instance;
Observable.Interval(TimeSpan.FromSeconds(2), instance)
.Subscribe(_ =>
{
Console.WriteLine(DateTime.Now); // dummy event
}
);
You retain the IDisposable
that was returned by Subscribe
, and call Dispose
on it. 保留
Subscribe
返回的IDisposable
,并在其上调用Dispose
。
There may well be a way of integrating the Rx IDisposable
-based unsubscription with CancellationToken
out of the box, but just calling Dispose
would be a start. 可能有一种方法可以将基于Rx
IDisposable
的取消订阅与CancellationToken
开箱即用,但只是调用Dispose
将是一个开始。 (You could always just register a continuation with the cancellation token to call dispose...) (您可以随时注册一个带取消令牌的续约来调用dispose ...)
Here's a short but complete example to demonstrate: 这是一个简短但完整的示例来演示:
using System;
using System.Reactive.Concurrency;
using System.Reactive.Linq;
using System.Threading;
class Program
{
static void Main(string[] args)
{
var instance = ThreadPoolScheduler.Instance;
var cts = new CancellationTokenSource(TimeSpan.FromSeconds(5));
var disposable = Observable
.Interval(TimeSpan.FromSeconds(0.5), instance)
.Subscribe(_ => Console.WriteLine(DateTime.UtcNow));
cts.Token.Register(() => disposable.Dispose());
Thread.Sleep(10000);
}
}
Just use one of the overloads of Subscribe
that takes a CancellationToken
: 只需使用带有
CancellationToken
的Subscribe
的重载之一:
observable.Subscribe(_ => Console.WriteLine(DateTime.UtcNow), cancellationToken);
This simplifies Jon Skeet's example: 这简化了Jon Skeet的例子:
using System;
using System.Reactive.Concurrency;
using System.Reactive.Linq;
using System.Threading;
class Program
{
static void Main(string[] args)
{
var instance = ThreadPoolScheduler.Instance;
var cts = new CancellationTokenSource(TimeSpan.FromSeconds(5));
Observable.Interval(TimeSpan.FromSeconds(0.5), instance)
.Subscribe(_ => Console.WriteLine(DateTime.UtcNow), cts.Token);
Thread.Sleep(10000);
}
}
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