[BUG] [Uno] [UWP] App does not start with the exception after upgrade from 15.1.1 to 16.1.1

[HavenDV]

Describe the bug
The application does not start after upgrade from 15.1.1 to 16.1.1 with the following exception:

System.Reflection.TargetInvocationException
  HResult=0x80131604
  Message=Exception has been thrown by the target of an invocation.
  Source=System.Private.CoreLib
  StackTrace:
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.Reflection.RuntimePropertyInfo.GetValue(Object obj, Object[] index)
   at ReactiveUI.Reflection.TryGetValueForPropertyChain[TValue](TValue& changeValue, Object current, IEnumerable`1 expressionChain) in D:\a\ReactiveUI\ReactiveUI\src\ReactiveUI\Expression\Reflection.cs:line 229
   at ReactiveUI.ObservedChangedMixin.TryGetValue[TSender,TValue](IObservedChange`2 item, TValue& changeValue) in D:\a\ReactiveUI\ReactiveUI\src\ReactiveUI\Mixins\ObservedChangedMixin.cs:line 105
   at ReactiveUI.ObservedChangedMixin.GetValueOrDefault[TSender,TValue](IObservedChange`2 item) in D:\a\ReactiveUI\ReactiveUI\src\ReactiveUI\Mixins\ObservedChangedMixin.cs:line 63
   at ReactiveUI.ReactiveNotifyPropertyChangedMixin.<>c.<NestedObservedChanges>b__5_0(IObservedChange`2 x) in D:\a\ReactiveUI\ReactiveUI\src\ReactiveUI\Mixins\ReactiveNotifyPropertyChangedMixin.cs:line 181
   at System.Reactive.Linq.ObservableImpl.Select`2.Selector._.OnNext(TSource value) in /_/Rx.NET/Source/src/System.Reactive/Linq/Observable/Select.cs:line 48
--- End of stack trace from previous location ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Reactive.AnonymousSafeObserver`1.OnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/AnonymousSafeObserver.cs:line 65
   at System.Reactive.Sink`1.ForwardOnError(Exception error) in /_/Rx.NET/Source/src/System.Reactive/Internal/Sink.cs:line 62
   at System.Reactive.ObserveOnObserverLongRunning`1.Drain() in /_/Rx.NET/Source/src/System.Reactive/Internal/ScheduledObserver.cs:line 756
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

  This exception was originally thrown at this call stack:
    [External Code]

Inner Exception 1:
Exception: The application called an interface that was marshalled for a different thread. (Exception from HRESULT: 0x8001010E (RPC_E_WRONG_THREAD))

Environment

• ReactiveUI Version: 16.1.1
• UWP Version: 10.0.19041.0

[glennawatson]

Try use reactiveui.uwp nuget

[HavenDV]

I think in this case you need to remove the uap TargetFramework from the ReactiveUI.Uno project.

[HavenDV]

This also leads to the problem of code duplication, because views have to define classes like this:

public abstract partial class ImportProjectViewBase :
    ReactiveUI.Uno.ReactiveUserControl<ViewModels.ImportProjectViewModel>
{
}

, but now the namespace for ReactiveUserControl is different for Uno and Uwp projects, which forces the user to use #ifdef

Possible solution is to migrate ReactiveUserControl from ReactiveUI.Uno to ReactiveUI namespace like ReactuveUI.Uwp does.

[github-actions]

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