System.MissingMethodException: Method not found: 'Microsoft.System.DispatcherQueue Microsoft.UI.Xaml.DependencyObject.get_DispatcherQueue()'

[sigmarsson]

Prism Create Region fails

has API changed anywhere ? Prism was working with earlier versions.

Steps to reproduce the bug

1. Update to ReUnion 0.8.1
2. Create Prism Region :

<ContentControl prism:RegionManager.RegionName="{x:Bind inf:RegionNames.TabView}" Grid.ColumnSpan="2" Grid.Row="0" />

Version Info

	<ItemGroup>
		<PackageReference Include="Microsoft.ProjectReunion" Version="0.8.1" />
		<PackageReference Include="Microsoft.ProjectReunion.Foundation" Version="0.8.1" />
		<PackageReference Include="Microsoft.ProjectReunion.WinUI" Version="0.8.1" />
		<Manifest Include="$(ApplicationManifest)" />
		<PackageReference Include="Microsoft.Extensions.Logging.Console" Version="5.0.0" />
		<PackageReference Include="Prism.DryIoc.Uno.WinUI" Version="8.1.97" />
		<PackageReference Include="Prism.Uno.WinUI" Version="8.1.97" />
		<PackageReference Include="Uno.Core" Version="2.4.0" />
	</ItemGroup>

NuGet package version:

Windows app type:

UWP	Win32

Windows version	Saw the problem?
Insider Build (xxxxx)
October 2020 Update (19042)
May 2020 Update (19041)
November 2019 Update (18363)
May 2019 Update (18362)
October 2018 Update (17763)
April 2018 Update (17134)
Fall Creators Update (16299)
Creators Update (15063)

Device form factor	Saw the problem?
Desktop	Yes
Xbox	No
Surface Hub	No
IoT	No

Additional context

Dump

[sigmarsson]

The DispatherQueue is existing, is it more like a Prism issue ?

[codendone]

In Reunion 0.8 DispatcherQueue moved from the Microsoft.System to the Microsoft.UI.Dispatching namespace. The error indicates this version of Prism is still using the old namespace and needs to be updated for 0.8.

[sigmarsson]

Thank you much @codendone !