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Where can I find this class? I have included the Rx extensions. I have made sure the version I'm compiling to is Silverlight 4. My VS2010 IDE still has no idea what the type IObservable is.

I get a compile error saying "type or namespace IObservable could not be found"

I didn't see them in the System.Collections.Generic namespace like this thread suggests http://dotnet.uservoice.com/forums/4325-silverlight-feature-suggestions/suggestions/523437-include-iobserver-t-and-iobservable-t-interface

Am I missing a reference to a dll?

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它在 System 命名空间中，类型为 IObservable<T>。您需要从 ReactiveExtensions SDK 添加对 System.Observable.dll 的引用。

此外，虽然不是严格要求，但您可能希望添加对 System.Reactive.dll 的引用，其中包含许多对 IObservable<T> 进行操作的扩展方法。

于 2010-09-29T18:25:57.080 回答
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答案不是很长，但也没什么好说的。

Silverlight 仅使用.NET Framework 的一小部分。也就是说，如果您不包含（参考） System.Reactive.dll ，则 Silverlight 4 中不包含 IObservable

于 2010-09-29T17:59:06.370 回答