Reactiveui: [BUG] Can't build with XF 4.0 Stable

[KennyDizi]

Describe the bug
Error The "LinkAssemblies" task failed unexpectedly.
Mono.Linker.MarkException: Error processing method: 'System.Void Xamarin.Forms.IShellControllerEvents::b__3_0(System.EventHandler)' in assembly: 'ReactiveUI.Events.XamForms.dll' ---> Mono.Cecil.ResolutionException: Failed to resolve System.Void Xamarin.Forms.IShellController::add_HeaderChanged(System.EventHandler)
at Mono.Linker.Steps.MarkStep.HandleUnresolvedMethod(MethodReference reference)
at Mono.Linker.Steps.MarkStep.MarkMethod(MethodReference reference)
at Mono.Linker.Steps.MarkStep.MarkInstruction(Instruction instruction)
at Mono.Linker.Steps.MarkStep.MarkMethodBody(MethodBody body)
at Mono.Linker.Steps.MarkStep.ProcessMethod(MethodDefinition method)
at Mono.Linker.Steps.MarkStep.ProcessQueue()
--- End of inner exception stack trace ---
at Mono.Linker.Steps.MarkStep.ProcessQueue()
at Mono.Linker.Steps.MarkStep.ProcessPrimaryQueue()
at Mono.Linker.Steps.MarkStep.Process()
at MonoDroid.Tuner.MonoDroidMarkStep.Process(LinkContext context)
at Mono.Linker.Pipeline.Process(LinkContext context)
at MonoDroid.Tuner.Linker.Process(LinkerOptions options, ILogger logger, LinkContext& context)
at Xamarin.Android.Tasks.LinkAssemblies.Execute(DirectoryAssemblyResolver res)
at Xamarin.Android.Tasks.LinkAssemblies.Execute()
at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
at Microsoft.Build.BackEnd.TaskBuilder.d__26.MoveNext()

Environment

• OS: Windows
• Vs version: 16.0.4
• Version of XF: 4.0.0.425677
• Version of RxUI: 9.15.9

[open-collective-bot[bot]]

Hey @xamarindevelopervietnam :wave:,

Thank you for opening an issue. We will get back to you as soon as we can. Also, check out our Open Collective and consider backing us.

https://opencollective.com/reactiveui

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ReactiveUI - Open Collective

An advanced, composable, functional reactive model-view-viewmodel framework for all .NET platforms!

[glennawatson]

Our events library is always one behind the latest. We just had a checkin for 3.6 go in this morning and I will do a release later today for that.

Part of the pain will go away once I get Pharmacist finalized https://github.com/reactiveui/pharmacist

Basically it's going to replace the .Events packages with a msbuild task.

So that way it'll scan your NuGet references and generate Observables for you.

GitHub

reactiveui/Pharmacist

Builds observables from events. Contribute to reactiveui/Pharmacist development by creating an account on GitHub.

[KennyDizi]

thanks @glennawatson

[glennawatson]

Resolving this, you can do something similar to what we do in our ReactiveUI.Events.XamForms project now.

https://github.com/reactiveui/ReactiveUI/blob/ee5d742751d5d1226fcce68714880955f3be6c78/src/ReactiveUI.Events.XamForms/ReactiveUI.Events.XamForms.csproj#L12

Include a PackageReference to "Pharmacist.MsBuild", which is a ReactiveUI project which generates observables for events for whatever PackageReference's are inside the current project.

Make sure it's in the project with XamarinForms.