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2011-09-17T04:14:46.770
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2011-09-17T04:14:46.770
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Suppose we have two methods <ol> <li>Before, Merges two observable sequences into one observable sequence by using a selector function whenever the first observable produces an element rigth before the second one.</li> <li>Without, Merges an observable sequence into other observable sequence every time two items came togheter from the first observable without any item from the second one.</li> </ol> With this methods the problem is almost solved. <pre><code>IObservable<TP> P = // observer P IObservable<TQ> Q = // observer Q var PP = P.Without((prev, next) => 0, Q); var PQ = P.Before(Q, (p,q) => f(p,q)); // apply the function var ResultSecuence = PP.Merge(PQ); </code></pre> And here are the two methods <pre><code>public static class Observer { /// <summary> /// Merges two observable sequences into one observable sequence by using the selector function /// whenever the first observable produces an element rigth before the second one. /// </summary> /// <param name="first"> First observable source.</param> /// <param name="second">Second observable source.</param> /// <param name="resultSelector">Function to invoke whenever the first observable produces an element rigth before the second one.</param> /// <returns> /// An observable sequence containing the result of combining elements of both sources /// using the specified result selector function. /// </returns> public static IObservable<TResult> Before<TLeft, TRight, TResult>(this IObservable<TLeft> first, IObservable<TRight> second, Func<TLeft, TRight, TResult> resultSelector) { var result = new Subject<TResult>(); bool firstCame = false; TLeft lastLeft = default(TLeft); first.Subscribe(item => { firstCame = true; lastLeft = item; }); second.Subscribe(item => { if (firstCame) result.OnNext(resultSelector(lastLeft, item)); firstCame = false; }); return result; } /// <summary> /// Merges an observable sequence into one observable sequence by using the selector function /// every time two items came from <paramref name="first"/> without any item of any observable /// in <paramref name="second"/> /// </summary> /// <param name="first"> Observable source to merge.</param> /// <param name="second"> Observable list to ignore.</param> /// <param name="resultSelector">Function to invoke whenever the first observable produces two elements without any of the observables in the secuence produces any element</param> /// <returns> /// An observable sequence containing the result of combining elements /// using the specified result selector function. /// </returns> public static IObservable<TResult> Without<TLeft, TResult>(this IObservable<TLeft> first, Func<TLeft, TLeft, TResult> resultSelector,params IObservable<object>[] second) { var result = new Subject<TResult>(); bool firstCame = false; TLeft lastLeft = default(TLeft); first.Subscribe(item => { if (firstCame) result.OnNext(resultSelector(lastLeft, item)); firstCame = true; lastLeft = item; }); foreach (var observable in second) observable.Subscribe(item => firstCame = false); return result; } } </code></pre>
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