ReactiveUI Fody [Reactive] attribute not working in Xamarin Forms

Question

I've tried following the documentation for ReactiveUI.Fody.

https://github.com/kswoll/ReactiveUI.Fody

Added the FodyWeavers.xml the generated file to the shared project.

<Weavers xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="FodyWeavers.xsd">
  <ReactiveUI />
</Weavers>

Added the [Reactive] attribute to the property in the shared project.

    [Reactive]
    public int MyNumber
    {
       get;
       set;
    }

Added references to the ReactiveUI.Fody 16.3.10 Nuget package to my Android, iOS & Shared project.

The property never updates to a newly set value.

Why doesn't this work?

And add link to the installation instructions you are following. Not sure if its still needed, but does FodyWeavers.xml contain line <ReactiveUI />? — ToolmakerSteve
– ToolmakerSteve, Commented Nov 17, 2021 at 0:07
Probably deeper than you want/need to go, but might be worth looking at github.com/reactiveui/ReactiveUI/tree/main/integrationtests/… and github.com/reactiveui/ReactiveUI/tree/main/integrationtests/…. Not sure exactly how to run those, but they presumably have been verified against current Xamarin.Forms. — ToolmakerSteve
– ToolmakerSteve, Commented Nov 17, 2021 at 0:16

Wen xu Li · Accepted Answer · 2021-11-17 02:57:41Z

0

For ReactiveUI.Fody 16.3.10, you need to ensure that The minimum version of Xamarin Android is Android 11.0, with SDK 30 and .Net Standard minimum version is 2.0.

Make sure your AndroidManifest.xml has SDK 30 as the target SDK.

If you want to dynamically refresh data in Xamarin Forms, using the INotifyPropertyChanged interface is also a good choice. For information about its use, you can refer to INotifyPropertyChanged.

answered Nov 17, 2021 at 2:57

Wen xu Li

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3 Comments

Sach K Over a year ago

The target SDK is 30 and .NET Standard version is 2.0 but, still getting the same issue

Wen xu Li Over a year ago

The link I provided is also a very common method, you can try it.

Sach K Over a year ago

The requirement is to get Fody working. I already know about the INotifyPropertyChanged interface

An enthusiast · Accepted Answer · 2025-06-27 11:01:12Z

0

This might be an old question but to answer for anyone looking at this in the future, we need to also inherit from ReactiveObject Base class to make the [Reactive] attribute work

answered Jun 27 at 11:01

An enthusiast

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