![]() ![]() The ReactiveUI (RxUI hereinafter) is an MVVM framework (and more), based on the Rx library, that provides you with tools that make it easier for you to maintain your UI project in a Reactive way. Another great resource to learn about Rx is the ReactiveUI I highly recommend the book “ Rx.NET in Action” by Tamir Dresher, that will teach you how to think reactively and will guide you through the power of Rx.NET. One of the traits of functional programming, is to address each problem in a compositional and concentrated way, so that each problem area can be configured in a single pipeline, composed with extension methods added on top of each other fluently. As things get more complicated, it gets harder to keep track of which properties notify, whom are they notifying, as well as which properties are dependent, and whom are they dependent on. Besides impacting our thinking, this also causes our VM code to be scattered all over the file, and each problem area can sometimes span several properties, commands and methods. planning how we’ll make INPC properties, what other properties they’re going to notify, what commands’ CanExchange status they should notify etc. Functional thinkingĪs object oriented and MVVM users, the way we think about our problem becomes the method we’re going to achieve it programmatically, e.g. In Rx, you can use one of the Subscribe overloads to finalize the subscription. ![]() It’s important to emphasize, that like LINQ to objects that doesn’t get materialized until you call ToList, ToArray or any of the aggregate functions (Sum etc.), the observable pipeline doesn’t execute until you subscribe to it. One of the most widely used toolbox in the Rx ecosystem is the Observable class, which is where the LINQ to Observable extensions stuff is going on (LINQ to Objects Enumerable’s counterpart), so it would be a good idea that you become familiar with its methods. Here’s what the IObserver interface looks like:ĭon’t worry, the Rx library provides you with numerous tools that do the job for you creating IObservables, so that you don’t ever have to implement these interfaces by hand. For this reason, the IObservable can also notify the IObserver with additional two notification types: error, and completion. Because we don’t iterate over an IObservable and the elements don’t necessarily come in a continuous manner, its ‘iteration’ lifecycle is meant to be long, sometimes as long as of the app’s. An IObserver is the mechanism that has the capability to subscribe to push based data. The difference is that the Subscribe method takes an IObserver. Similar to IEnumerable, that classes implementing it expose the GetEnumerator method, classes implementing the IObservable interface expose the Subscribe method. Select), and perform many more manipulations on your data.ĭue to their difference in functionality, IObservable and IEnumerable also differ in their interface structure. ![]() Like LINQ, Rx offers a wide set of operators that can filter (e.g. This makes subscribing to events, or any other unexpected data sources, even infinite ones very easy. The major noticeable difference between the two is that while the IEnumerable is pull-based, and the consuming part is the one making its move iterating and retrieving the data and the source listens, IObservable is the opposite – the consumer listens to the source, and the source is the one notifying all listeners about a new item that is available. The System.Reactive (Rx hereinafter) library, is a set of extensions that offer LINQ-like extensions methods on the IObservable type.Īn IObservable is very similar to IEnumerable. The Code is located under the UnoRx repo on GitHub, so just clone the code from GitHub to start an Uno project with RxUI and Microsoft Extensions DI and logging. It uses the following frameworks: Uno Platform, ReactiveUI, and Microsoft Extensions for hosting, dependency injection, and for logging. The article shows how to create a cross-platform Uno template app that consists of a basic NavigationView and basic ViewModel navigation capabilities, and can run on Windows, Android, iOS, and as a website (via WASM). ![]()
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