[英]How Can I Unfold This Event to an Observable Sequence?
I'm trying to write an Add-In for Outlook, and one of the events I'm using is ItemsEvents_Event.ItemChange
- and its handler's signature takes an Object
as a parameter (the item that changed): 我正在尝试为Outlook编写外接程序,而我正在使用的事件之一是ItemsEvents_Event.ItemChange
其处理程序的签名将Object
作为参数(已更改的项目):
items.ItemChange += CalendarItems_ItemChange;
private void CalendarItems_ItemChange(object anItem) {...}
How would I use Observable.FromEvent
or Observable.FromEventPattern
to create an observable sequence from this event "stream" instead of attaching/detaching the event as usual? 我将如何使用Observable.FromEvent
或Observable.FromEventPattern
从此事件“流”创建可观察序列,而不是像往常那样附加/分离事件?
You need to use the FromEvent
conversion overload to tell Rx how it should interpret your event: 您需要使用FromEvent
转换重载来告诉Rx如何解释事件:
IObservable<TEventArgs> FromEvent<TDelegate, TEventArgs>(Func<Action<TEventArgs>, TDelegate> conversion,
Action<TDelegate> addHandler,
Action<TDelegate> removeHandler);
In your case it would look like: 在您的情况下,它看起来像:
var source = Observable.FromEvent<ItemsEvents_ItemEventChangeHandler, object>(
emit => new ItemsEvents_ItemEventChangeHandler((obj) => emit(obj)),
h => items.ItemChange += h,
h => items.ItemChange -= h);
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