system.reactive

I was trying out a "type-to-search" Reactive-Extensions sample which takes a string from a textbox (WPF app if it matters) and does a potentially-lengthy server-side search (simulated in my case with a Thread.Sleep) and displays the result(s) in a listbox. The key features of this particular "module" would be : async search; UI is not frozen while searching throttled; typing fast would not generate a server-side search for each keystroke distinct searching; after searching for "asd" and having the result(s) displayed typing fast [backspace], d (i.e. deleting the last character and retyping it

I have an observable sequence of event objects and a number of observers handling specific types of events. I need to accomplish the following scenarios: Some event types need to be handled by the first observer matching a condition (e.g. observable.SubscribeExclusively(x=>{}) and become "unobservable" to the others. If there are no subscriptions, set some default handler (e.g. observable.SubscribeIfNoSubscriptions(x=>{})) so that no items get lost (this handler may for example save the item to a database so that it is processed later). Is there a way to handle these cases with Rx? I'm not

Suppose I have a set of URIs that I am monitoring for availability. Each URI is either "up" or "down", and new URIs to monitor may be added to the system at any time: public enum ConnectionStatus { Up, Down } public class WebsiteStatus { public string Uri { get; set; } public ConnectionStatus Status { get; set; } } public class Program { static void Main(string[] args) { var statusStream = new Subject<WebsiteStatus>(); Test(statusStream); Console.WriteLine("Done"); Console.ReadKey(); } private static void Test(IObservable<WebsiteStatus> statusStream) { } } Now suppose in Test() I want to

I have a sequence of numbers that are processed using an async method. I'm simulating a remote service call that may fail . In case of failure, I would like to retry until the call successes. The problem is that with the code I'm trying, every time an exception is thrown in the async method, the sequence seems to hang forever . You can test it with this simple code snippet (it's tested in LINQPad) Random rnd = new Random(); void Main() { var numbers = Enumerable.Range(1, 10).ToObservable(); var processed = numbers.SelectMany(n => Process(n).ToObservable().Retry()); processed.Subscribe( f =>

I'm learning about Reactive extensions and trying to re-factor some of my code. UDPClient.EndReceive takes a ref IPEndPoint parameter, so I currently have this working: UdpClient receiverUDP = new UdpClient(); receiverUDP.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true); receiverUDP.EnableBroadcast = true; receiverUDP.Client.ExclusiveAddressUse = false; receiverUDP.Client.Bind(new IPEndPoint(IPAddress.Any, 1234)); IPEndPoint ep = null; var async = Observable.FromAsyncPattern<byte[]>(receiverUDP.BeginReceive, (i) => receiverUDP.EndReceive(i, ref ep)); var

This one's got me a bit baffled. I've written some extension methods on UIElement to provide Observables on some of the mouse events. Here are the relevant ones: public static IObservable<EventPattern<MouseEventArgs>> ObserveMouseLeftButtonDown(this UIElement element) { return Observable.FromEventPattern<MouseEventArgs>(element, "MouseLeftButtonDown"); } public static IObservable<EventPattern<MouseEventArgs>> ObserveMouseMove(this UIElement element) { return Observable.FromEventPattern<MouseEventArgs>(element, "MouseMove"); } So far, so mind-numbingly simple. Then I create a composite event to