如果我执行以下操作:
var obs =
Observable
.Interval(TimeSpan.FromSeconds(1))
.Select(x => "A" + x.ToString());
obs
.Subscribe(x => Console.WriteLine("From first: " + x.ToString()));
Observable
.Timer(TimeSpan.FromSeconds(3))
.SelectMany(_ => obs)
.Subscribe(x => Console.WriteLine("From second: " + x.ToString()));
我会在4秒后得到这个:
From first: A0
From first: A1
From first: A2
From second: A0
From first: A3
是否有一个等同于Observable.Interval
的'Hot'会产生这个:
From first: A0
From first: A1
From first: A2
From second: A3
From first: A3
答案 0 :(得分:4)
使用Publish()和Connect()会让你的冷可观察性变得很热。
var published = Observable
.Interval(...)
.Select(...)
.Publish();
var connectionSubscription = published.Connect();
var observerSubscription = published.Subscribe(...);
值得注意的是,一旦Connect()调用发生,序列就会变热。您可以在Connect()之前订阅,但请确保在某个阶段调用它,否则将无法观察到任何内容。 Connect()有一些替代方案,例如RefCount()所以值得谷歌。另外值得注意的是,Publish()返回一个提供Connect()调用的IConnectableObservable。