public
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Reactive Extension's Where method reimplemented

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reactive-where.cs
C#
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public static class ObservableExtensions
{
public static IObservable<TSource> Where<TSource> (this IObservable<TSource> source, Func<TSource,bool> predicate)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (predicate == null)
{
throw new ArgumentNullException("predicate");
}
// consider whether this should be wrapped in Observable.Defer( () => {} )
return Observable.Create<TSource>(observer =>
{
return source.Subscribe(x=>
{
bool flag = false;
try
{
flag = predicate(x);
}
catch (Exception e)
{
observer.OnError(e);
return;
}
if (flag)
{
observer.OnNext(x);
}
},
observer.OnError,
observer.OnCompleted
);
});
}
}

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