[Bug]: WireUpControls throws exception in net8.0-android about reactiveui

[tommy10344]

@dpvreony Thanks! Sorry for the late reply.

I added <AndroidUseDesignerAssembly>False</AndroidUseDesignerAssembly> to csproj and tried to build it and got the following build error.

/usr/local/share/dotnet/packs/Microsoft.Android.Sdk.Darwin/34.0.52/tools/Xamarin.Android.Resource.Designer.targets(146,3): error XA1034: Your project references '/Users/foo/.nuget/packages/reactiveui/19.5.39/lib/net8.0-android34.0/ReactiveUI.dll' which uses the `_Microsoft.Android.Resource.Designer` assembly, but you do not have this feature enabled. Please set the `AndroidUseDesignerAssembly` MSBuild property to `true` in your project file. [/path/to/ReactiveUI-WireUpControls-Issue/ReactiveUI-WireUpControls-Issue.csproj]

To use this setting, does ReactiveUI also need to have the same setting?
https://github.com/xamarin/xamarin-android/blob/main/Documentation/guides/building-apps/build-properties.md#androidusedesignerassembly

.NET 8 Projects which choose to turn this setting off will not be able to consume references which do use it. If you try to use an assembly which does have this feature enabled in a project that does not, you will get a XA1034 build error.

Or is there any other way?

[ChrisPulman]

Hi, I will try to take a look at this at the weekend, I will be travelling back to the UK from Brazil tomorrow if I have any chance during the flight I will take a look then.

[dpvreony]

can you try

<AndroidUseDesignerAssembly>False</AndroidUseDesignerAssembly>

if it works then you're correct it's a resource issue with the new build chain.

[gerardvanderkruijs]

I am having the same issue with ReactiveUI version 19.6.1, any updates on this?

[ChrisPulman]

So after some investigations it looks like there is a more widespread issue with this, for some reason the Resource returns no elements for net 8.0. I am trying to see if there is a different method of obtaining Resources with net 8. I will update on my findings and create a fix unless its a core bug with net 8

[ChrisPulman]

This shows the issue we are experiencing with net 8.0

[ChrisPulman]

https://devblogs.microsoft.com/dotnet/android-resource-designer-dotnet-8/
This explains the reason, I will work on fixing this ASAP

.NET Blog

Improvements & Changes in Android resource generation in .NET 8 - .NET Blog

In .NET 8 we have made some vast improvements in changes to how Android resources work in regards to the designer assembly. If you are building Android apps and libraries there are some important changes to know about.

[ChrisPulman]

This will be resolved in the release in the next hour, thank you for raising this issue and sorry we took so long to resolve it.