reactiveui at ch9 runsheet

reactiveui-on-desktop-at-ch9-abstract.md

Reactive MVVM on the .NET Platform

nb: I'm not happy with this title, feel free to change it.

abstract

Tune in for Jeff and Geoff to learn about reactive programming. A paradigm that allows you to express the idea around a feature in one readable place, abstract mutable state away from your user interfaces and improve the testability of your application.

runsheet

1. introduction to reactiveui

   • show website
   • is part of dotnet foundation
   • show that the code is on github
   • supports winforms, wpf and more
   • [call of action] reactiveui.net/slack

2. shoutout to the maintainers (esp new folks)

3. the reactive extensions were invented at microsoft

4. introduction to observables

   • single value (object - sync)
   • multiple values (collection - sync)
   • single values over time (task - async)
   • multiple values over time (observable - async)
   • tasks can convert to observables (visa versa)

5. teach people reactive programming with a spreadsheet

   • demonstrate the concept of whenany

   • Three cells, A, B, and C.

   • C is defined as the sum of A and B.

   • Whenever A or B changes, C reacts to update itself.

   • Now you understand reactive programming

   • Changes propagating throughout a system automatically.

   • Welcome to the peanut butter and jelly of programming paradigms.

6. introduce open-source examples in the wild

   • https://github.com/reactiveui/Akavache

     IObservable GetAndFetchLatest(this IBlobCache This, ...)

   • https://github.com/RolandPheasant/DynamicData

     if you are in finance you should be using this library if you process collections of events over time you should be using this library

   • https://github.com/RolandPheasant/TailBlazer

     an wpf implementation of dynamic data

   • https://github.com/github/VisualStudio

     reactiveui is in visual studio, suprise!

7. let's pair

   • option: build an wpf application using reactiveui

     https://medium.com/@worldbeater/reactive-mvvm-for-net-platform-175dc69cfc82

   • option: debug the code examples from the reactiveui book (wpf)

   • option: debug visual studio extension (wpf)

   • option: refactor existing mvvm app towards reactiveui (it depends)

8. additional

   • reactiveui.events with winforms/wpf - komnami

Worth mentioning that Avalonia now fully supports ReactiveUI, including binding and routing https://reactiveui.net/docs/getting-started/installation/avalonia Avalonia is a cross-platform GUI framework which allows us to run .NET apps on MacOS, Windows and Linux. A framework like Electron, but with Xaml, C# and Rx

I love the excel example to illustrate reactive programming

https://devblogs.microsoft.com/visualstudio/windows-desktop-developer-twitch-workshop-march-14-2019/