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ReactiveX - SkipUntil operator
Reactive Extensions再入門 その８「SkipとTakeメソッド」
SkipUntil 忽略源数据流的数据，直到另一个数据流开始发送数据后才开始发送源数据流的数据。

• RxNET

var subject = new Subject<int>();
var otherSubject = new Subject<Unit>();
subject
    .SkipUntil(otherSubject)
    .Subscribe(Console.WriteLine, () => Console.WriteLine("Completed"));
    subject.OnNext(1);
    subject.OnNext(2);
    subject.OnNext(3);
    otherSubject.OnNext(Unit.Default);
    subject.OnNext(4);
    subject.OnNext(5);
    subject.OnNext(6);
    subject.OnNext(7);
    subject.OnNext(8);
    subject.OnCompleted();
/*
4
5
6
7
8
Completed
*/