Upgrading-Prism.md

Upgrading Prism.Avalonia

This file documents the upgrade path of the Prism releases, noting files removed ❌ , added 🆕, and notes on breaking changes.

Icon	Text	Description
🔳	:white_square_button:	Underway
✔️	:heavy_check_mark:	Updated
🆕	:new:	New
❌	:x:	Removed
⚠️	:warning:	Pending
💔	:broken_heart:	Never implemented in this platform

• Icon Reference

Overview Prism 8.1.97 to 9.0.x

This file documents the upgrade path from Prism v8.1.97 to v9.0-pre support. Soon we will be moving this repo to be apart of the main Prism Library :)

Each of the following will be tagged and merged into the branch Prism-9x before being merged with develop and master branches.

Release Comparison

As we all know, not everything is straight forward between these two XAML technologies. However, it's a good reminder to document the differences and 'got-yas'.

• 9.0.274-pre - 9.0.401-pre
• 9.0.264-pre - 9.0.274-pre
• DNF - 9.0.264-pre - (DNF = Dot Net Foundation)
• Prism v8.0.0.1909 to v8.1.97
• Prism v7.2.0.1422 to v8.1.97
• Prism v7.2.0.1422 to v8.0.0.1909

Changes

• Samples folder renamed to e2e
• Prism.Dialogs
  • Various updates, see section before for more info
• NavigationResult returns the property Success instead of Result

Dialogs

Breaking Changes:

• UPGRADE SAMPLE NEEDED
• Namespace changed from Prism.Services.Dialogs to Prism.Dialogs.
• IDialogAware property, RequestClose
  • Refactored from event to property (event Action<IDialogResult> RequestClose; -> DialogCloseListener RequestClose { get; })
  • Property is now read-only
• IDialogService moved to Prism.Core
  • Deprecated void Show(...)
  • Deprecated void ShowDialog(Window owner, ...

Removed Files:

File	Status	Notes
ButtonResult.cs	❌	Absorbed into Prism.Core
DialogParameters.cs	❌	Absorbed into Prism.Core
DialogResult.cs	❌	Absorbed into Prism.Core
IDialogParameters.cs	❌	Absorbed into Prism.Core
IDialogResult.cs	❌	Absorbed into Prism.Core
IDialogService.cs	🔳 ❌	Absorbed into Prism.Core
IDialogServiceExtensions.cs	❌	Absorbed into Prism.Core
IDialogServiceCompatExtensions	🆕
KnownDialogParameters	🆕

Not Implemented:

• IDialogWindow.Style - Custom window styles are not implemented at this time.
• DialogWindow.axaml.cs - Does not implement this.AttachDevTools(); at this time - would be helpful during debugging

Avalonia vs WPF:

Avalonia	WPF	Reference
dialogWindow.Opened	dialogWindow.Loaded
EventHandler<WindowClosingEventArgs>? Closing;	event CancelEventHandler Closing;	IDialogWindow.cs

Prism.DryIoc.Avalonia

File	Status	Notes
DryIocContainerExtension.cs	❌	New Prism.Container Packages

Prism.Avalonia.Tests

File	Status	Notes
MockHostAwareRegionBehavior.cs	✔️
MockPresentationRegion.cs	✔️
MockRegion.cs	✔️
MockRegionAdapter.cs	✔️
MockRegionBehavior.cs	✔️
MockRegionBehaviorCollection.cs	✔️
MockRegionManager.cs	✔️
MockRegionmanagerAccessor.cs	✔️
MockSortableViews.cs	✔️
MockViewsCollection.cs	✔️
PrismApplicationBaseFixture.cs	✔️
PrismBootstrapperBaseFixture.cs	✔️
AutoPopulateRegionBehaviorFixture.cs	✔️
RegionActiveAwareBehaviorFixture.cs	✔️
RegionManagerRegistrationBehaviorFixture.cs	✔️
RegionMemberlifetimeBehaviorFixture.cs	✔️
ContentControlRegionAdapterFixture.cs	✔️
RegionAdapterBaseFixture.cs	✔️
RegionBehaviorFixture.cs	✔️
RegionFixture.cs	✔️
RegionManagerRequestNavigateFixture.cs	✔️
RegionViewRegistryFixture.cs	✔️

Future Feature Work To Add

Project	Class
Prism.Avalonia	Interactivity/InvokeCommandAction
Prism.Avalonia.Tests	Regions/ItemsControlRegionAdapterFixture
Prism.Avalonia.Tests	Regions/SelectorRegionAdapterFixture

Upgrading from Prism 7.2 to 8.1

• Basis of comparison: Prism Library v7.2.0.1422...v8.1.97

Action Items

• Upgrade Prism.Avalonia
• Upgrade Prism.DryIoc
• Upgrade Prism.Unity
• Remove IOCs not supported by Prism v8.1
• Add Unit Tests, matching PrismLibrary
• Upgrade Samples
• Upgrade to .NET 6

Out of Scope

• Add Prism Dialogs for Avalonia
  • This requires Avalonia v0.11 and PR #8277 as per Issue 7908.
• Restructure folders to match PrismLibrary

Upgrade Progress

File	Status	Notes
Readme.md	⚠️	Needs updated to match 8.1.x NuGet package version
src\Readme.md	🆕	Added from PrismLibrary v8.1.x

Prism.Avalonia

File	Status	Notes
Prism.Avalonia.csproj	✔️	Added netcore and net45 targeting conditions, as per PrismLibrary v8.1.x
PrismApplicationBase.cs	✔️
Bootstrapper.cs	✔️ ❌	Renamed to PrismBootstrapperBase.cs
PrismBootstrapperBase.cs	✔️ 🆕	Replaces Boostrapper.cs
PrismInitializationExtensions.cs	✔️ ⚠️ 🆕	Needs, SelectorRegionAdapter.cs. Register container, Behavior, and Adapter goodies.
Common\MvvmHelpers.cs	✔️
Common\ObservableObject.cs	✔️	Needs verified
Common\UriParsingHelper.cs	✔️
Events\WeakDelegatesManager.cs	✔️ ❌	It's apart of Prism.Events
Extensions\CollectionExtensions.cs	✔️
Extensions\DependencyObjectExtensions.cs	⚠️	Needs verified. Rename to AvaloniaObjectionExtension?
Extensions\ExceptionExtension.cs	✔️ ❌
Extensions\ServiceLocationExtension.cs	✔️ ❌
Interactivity\CommandBehaviorBase.cs	✔️ ⚠️	Needs verification
Interactivity\InvokeCommandAction.cs	⚠️ 🆕	Needs converted to Avalonia; reference AvaloniaBehaviors.
Ioc\ContainerProviderExtension.cs	✔️ 🆕 ⚠️	Needs verification
Ioc\IContainerRegistryExtensions.cs	✔️
Logging\TextLogger.cs	✔️ ❌	Removed from Prism
Logging\TraceLogger.cs	✔️ ❌	Removed from Prism
Modularity\AssemblyResolver.Desktop.cs	✔️
Modularity\ConfigurationModuleCatalog.Desktop.cs	✔️
Modularity\ConfigurationStore.Desktop.cs	✔️
Modularity\DirectoryModuleCatalog.Desktop.cs	✔️ ❌
Modularity\DirectoryModuleCatalog.net45.cs	✔️ 🆕
Modularity\DirectoryModuleCatalog.netcore.cs	✔️ 🆕
Modularity\FileModuleTypeLoader.Desktop.cs	✔️
Modularity\IAssemblyResolver.Desktop.cs	✔️
Modularity\IConfigurationStore.Desktop.cs	✔️
Modularity\IModuleCatalogExtensions.cs	✔️
Modularity\IModuleGroupsCatalog.cs	✔️
Modularity\IModuleTypeLoader.cs	✔️
Modularity\ModuleAttribute.Desktop.cs	✔️
Modularity\ModuleCatalog.cs	✔️
Modularity\ModuleConfigurationElement.Desktop.cs	✔️
Modularity\ModuleConfigurationElementCollection.Desktop.cs	✔️
Modularity\ModuleDependencyCollection.Desktop.cs	✔️
Modularity\ModuleDependencyConfigurationElement.Desktop.cs	✔️
Modularity\ModuleDownloadProgressChangedEventArgs.cs	✔️ ❌
Modularity\ModuleInfo.cs	✔️
Modularity\ModuleInfo.Desktop.cs	✔️
Modularity\ModuleInfoGroup.cs	✔️
Modularity\ModuleInfoGroupExtensions.cs	✔️
Modularity\ModuleInitializer.cs	✔️
Modularity\ModuleManager.cs	✔️
Modularity\ModuleManager.Desktop.cs	✔️
Modularity\ModulesConfigurationSection.Desktop.cs	✔️
Modularity\ModuleTypeLoaderNotFoundException.cs	✔️
Modularity\ModuleTypeLoaderNotFoundException.Desktop.cs	✔️
Modularity\XamlModuleCatalog.cs	🔳 🆕	disabled; only used by WPF, not XF, Maui or UNO.
Mvvm\ViewModuleLocator.cs	✔️
Properties\AssemblyInfo	✔️
Properties\Resources.resx	✔️
Properties\Resources.Designer.cs	✔️
Properties\Settings.Designer.cs	✔️
Properties\Settings.settings	✔️
Regions\Behaviors\AutoPopulateRegionBehavior.cs	✔️
Regions\Behaviors\BindRegionContextToAvaloniaObjectBehavior.cs	✔️	Equivilant, BindRegionContextToDependencyObjectBehavior
Regions\Behaviors\ClearChildViewsRegionBehavior.cs	✔️
Regions\Behaviors\DelayedRegionCreationBehavior.cs	✔️ ⚠️	Needs Avalonia equivilant of FrameworkContentElement += Loaded
Regions\Behaviors\DestructibleRegionBehavior.cs	✔️ 🆕
Regions\Behaviors\IHostAwareRegionBehavior.cs	✔️
Regions\Behaviors\RegionActiveAwareBehavior.cs	✔️
Regions\Behaviors\RegionCreationException.cs	✔️
Regions\Behaviors\RegionCreationException.Desktop.cs	✔️
Regions\Behaviors\RegionManagerRegistrationBehavior.cs	✔️
Regions\Behaviors\RegionMemberLifetimeBehavior.cs	✔️
Regions\Behaviors\SelectorItemsSourceSyncBehavior.cs	🔳 ⚠️	Needs attention
Regions\Behaviors\SyncRegionContextWithHostBehavior.cs	✔️
Regions\AllActiveRegion.cs	✔️
Regions\ContentControlRegionAdapter.cs	✔️
Regions\DefaultRegionManagerAccessor.cs	✔️
Regions\IConfirmNavigationRequest.cs	✔️
Regions\IJournalAware.cs	✔️
Regions\INavigateAsync.cs	✔️
Regions\INavigationAware.cs	✔️
Regions\IRegion.cs	✔️
Regions\IRegionAdapter.cs	✔️
Regions\IRegionBehavior.cs	✔️
Regions\IRegionBehaviorCollection.cs	✔️
Regions\IRegionBehaviorFactory.cs	✔️
Regions\IRegionBehaviorFactoryExtensions.cs	✔️ 🆕
Regions\IRegionCollection.cs	✔️
Regions\IRegionManager.cs	✔️
Regions\IRegionManagerAccessor.cs	✔️
Regions\IRegionManagerExtensions.cs	✔️ 🆕
Regions\IRegionMemberLifetime.cs	✔️
Regions\IRegionNavigationContentLoader.cs	✔️
Regions\IRegionNavigationJournal.cs	✔️
Regions\IRegionNavigationJournalEntry.cs	✔️
Regions\IRegionNavigationService.cs	✔️
Regions\IRegionViewRegistry.cs	✔️
Regions\IViewsCollection.cs	✔️
Regions\ItemMetadata.cs	✔️
Regions\ItemsControlRegionAdapter.cs	✔️
Regions\NavigationAsyncExtensions.cs	✔️
Regions\NavigationContext.cs	✔️
Regions\NavigationParameters.cs	✔️
Regions\NavigationResult.cs	✔️
Regions\Region.cs	✔️
Regions\RegionAdapterBase.cs	✔️
Regions\RegionAdapterMappings.cs	✔️
Regions\RegionBehavior.cs	✔️
Regions\RegionBehaviorCollection.cs	✔️
Regions\RegionBehaviorFactory.cs	✔️
Regions\RegionContext.cs	✔️
Regions\RegionManager.cs	✔️
Regions\RegionMemberLifetimeAttribute.cs	✔️
Regions\RegionNavigationContentLoader.cs	✔️
Regions\RegionNavigationEventArgs.cs	✔️
Regions\RegionNavigationFailedEventArgs.cs	✔️
Regions\RegionNavigationJournal.cs	✔️
Regions\RegionNavigationJournalEntry.cs	✔️
Regions\RegionNavigationService.cs	✔️
Regions\RegionViewRegistry.cs	✔️
Regions\SelectorRegionAdapter.cs	🔳 ⚠️	Needs attention - Commented out and disabled in PrismInitializationExtensions
Regions\SingleActiveRegion.cs	✔️
Regions\SyncActiveStateAttribute.cs	✔️
Regions\UpdateRegionsException.Desktop.cs	✔️
Regions\UpdateRegionsException.cs	✔️
Regions\ViewRegisteredEventArgs.cs	✔️
Regions\ViewRegistrationException.Desktop.cs	✔️
Regions\ViewRegistrationException.cs	✔️
Regions\ViewSortHintAttribute.cs	✔️
Regions\ViewsCollection.cs	✔️
Services\Dialogs\ButtonResult.cs	🆕 ✔️
Services\Dialogs\Dialog.cs	🆕 ✔️
Services\Dialogs\DialogParameters.cs	🆕 ✔️
Services\Dialogs\DialogResult.cs	🆕 ✔️
Services\Dialogs\DialogService.cs	🆕 ✔️
Services\Dialogs\DialogWindow.xaml	🆕 ✔️
Services\Dialogs\DialogWindow.xaml.cs	🆕 ✔️
Services\Dialogs\IDialogAware.cs	🆕 ✔️
Services\Dialogs\IDialogParameters.cs	🆕 ✔️
Services\Dialogs\IDialogResult.cs	🆕 ✔️
Services\Dialogs\IDialogService.cs	🆕 ✔️
Services\Dialogs\IDialogServiceExtensions.cs	🆕 ✔️
Services\Dialogs\IDialogWindow.cs	🆕 ✔️
Services\Dialogs\IDialogWindowExtensions.cs	🆕 ✔️

Containers

Containers is a 🆕 Folder

File	Status	Notes
Containers\Prism.DryIoc.Shared\DryIocContainerExtension.cs	🆕
Containers\Prism.DryIoc.Shared\Prism.DryIoc.Shared.projitems	🆕
Containers\Prism.DryIoc.Shared\Prism.DryIoc.Shared.shproj	🆕
Containers\Prism.DryIoc.Shared\PrismIocExtensions.cs	🆕
Containers\Prism.Unity.Shared\Prism.Unity.Shared.projitems	🆕
Containers\Prism.Unity.Shared\Prism.Unity.Shared.shproj	🆕
Containers\Prism.Unity.Shared\PrismIocExntensions.cs	🆕
Containers\Prism.Unity.Shared\UnityContainerExtension.cs	🆕

Prism.DryIoc.Avalonia

File	Status	Notes
Prism.DryIoc.Avalonia.csproj.cs	✔️	Updated to DryIoc v4.8.1
DryIocServiceLocatorAdapter.cs	❌
GlobalSuppressions.cs	✔️
PrismApplication.cs	✔️
PrismBootstrapper.cs	🆕
Ioc\DryIocContainerExtension.cs	❌	Moved to Containers
Ioc\PrismIocExtensions.cs	❌	Moved to Containers
Legacy\DryIocBootstrapper.cs	❌
Legacy\DryIocExtensions.cs	❌
Properties\AssemblyInfo	🆕
Properties\Resources.Designer.resx	🔳
Properties\Resources.resx	🔳

Prism.Unity.Avalonia

File	Status	Notes
PrismApplication.cs	✔️
PrismBootstrapper.cs	✔️
GlobalSuppressions.cs	✔️

Tests - Prism.Avalonia.Tests

Test writted to Prism.WPF specs.

File	Status	Notes
Prism.Avalonia.Tests.csproj	✔️	Upgraded to .NET 6 (Prism v8.1.97 uses .NET v4.7.1)
CollectionChangedTracker.cs	✔️
CollectionExtensionsFixture.cs	✔️
CompilerHelper.Desktop.cs	✔️
ExceptionAssert.cs	✔️
ListDictionaryFixture.cs	✔️
CollectionChangedTracker.cs	✔️
PrismApplicationBaseFixture.cs	✔️ ⚠️
PrismBootstrapperBaseFixture.cs	✔️	Throwing, "protection level errors."
Logging\ ...	❌
Interactivity\CommandBehaviorBaseFixture.cs	✔️
Interactivity\InvokeCommandActionFixture.cs	✔️
Mocks\Modules\MockAbstractModule.cs	✔️
Mocks\Modules\MockAttributedModule.cs	✔️
Mocks\Modules\MockDependantModule.cs	✔️
Mocks\Modules\MockDependencyModule.cs	✔️
Mocks\Modules\MockExposingTypeFromGacAssemblyModule.cs	✔️
Mocks\Modules\MockModuleA.cs	✔️
Mocks\Modules\MockModuleReferencedAssembly.cs	✔️
Mocks\Modules\MockModuleReferencingAssembly.cs	✔️
Mocks\Modules\MockModuleReferencingOtherModule.cs	✔️
Mocks\Modules\MockModuleThrowingException.cs	✔️
Mocks\MockAsyncModuleTypeLoader.cs	✔️
Mocks\MockClickableObject.cs	✔️
Mocks\MockCommand.cs	✔️
Mocks\MockConfigurationStore.Desktop.cs	✔️
Mocks\MockContainerAdapter.cs	✔️
Mocks\MockDelegateReference.cs	✔️
Mocks\MockDependencyObject.cs	✔️
Mocks\MockFrameworkContentElement.cs	✔️ ⚠️	[AvaloniaUI/Avalonia#8277]
Mocks\MockFrameworkElement.cs	✔️ ⚠️
Mocks\MockHostAwareRegionBehavior.cs	✔️
Mocks\MockPresentationRegion.cs	✔️
Mocks\MockRegion.cs	✔️
Mocks\MockRegionAdapter.cs	✔️
Mocks\MockRegionBehavior.cs	✔️
Mocks\MockRegionBehaviorCollection.cs	✔️
Mocks\MockRegionManager.cs	✔️
Mocks\MockRegionManagerAccessor.cs	✔️
Mocks\MockSortableViews.cs	✔️
Mocks\MockViewsCollection.cs	✔️
ViewModels\MockOptOutViewModel.cs	✔️
ViewModels\MockViewModel.cs	✔️
Views\Mock.cs	✔️
Views\MockOptOut.cs	✔️
Views\MockView.cs	✔️
Modularity\AssemblyResolverFixture.Desktop.cs	✔️
Modularity\ConfigurationModuleCatalogFixture.cs	✔️
Modularity\ConfigurationStoreFixture.cs	✔️
Modularity\DirectoryModuleCatalogFixture.cs	🔳 ⚠️
Modularity\FileModuleTypeLoaderFixture.Desktop.cs	✔️
Modularity\ModuleAttributeFixture.Desktop.cs	✔️
Modularity\ModuleCatalogFixture.cs	✔️
Modularity\ModuleDependencySolverFixture.cs	✔️
Modularity\ModuleInfoGroupExtensionsFixture.cs	✔️
Modularity\ModuleInfoGroupFixture.cs	✔️
Modularity\ModuleInitializerFixture.cs	✔️
Modularity\ModuleManagerExtensionsFixture.cs	✔️
Modularity\ModuleManagerFixture.cs	✔️
Modularity\XamlModuleCatalogFixture.txt.dll	✔️
Modularity\DirectoryModuleCatalogFixture.cs	✔️
Modularity\ModuleCatalogXml\InvalidDependencyModuleCatalog.xaml	✔️
Modularity\ModuleCatalogXml\SimpleModuleCatalog.xaml	✔️
Mvvm\ViewModelLocatorFixture.cs	✔️
Regions\AllActiveRegionFixture.cs	✔️
Regions\ContentControlRegionAdapterFixture.cs	✔️ ⚠️
Regions\ItemsControlRegionAdapterFixture.cs	🔳 ⚠️ [AvaloniaUI/Avalonia#7553]
Regions\LocatorNavigationTargetHandlerFixture.cs	✔️
Regions\NavigationAsyncExtensionsFixture.cs	✔️
Regions\NavigationContextFixture.cs	✔️
Regions\NavigationParametersFixture.cs	✔️
Regions\RegionAdapterBaseFixture.cs	✔️
Regions\RegionAdapterMappingsFixture.cs	✔️
Regions\RegionBehaviorCollectionFixture.cs	✔️
Regions\RegionBehaviorFactoryFixture.cs	✔️
Regions\RegionBehaviorFixture.cs	✔️
Regions\RegionFixture.cs	✔️
Regions\RegionManagerFixture.cs	✔️
Regions\RegionManagerRequestNavigateFixture.cs	✔️
Regions\RegionNavigationJournalFixture.cs	✔️
Regions\RegionNavigationServiceFixture.new.cs	✔️
Regions\RegionViewRegistryFixture.cs	✔️
Regions\SelectorRegionAdapterFixture.cs	🔳 🆕 ⚠️
Regions\SingleActiveRegionFixture.cs	✔️
Regions\ViewsCollectionFixture.cs	✔️
Regions\Behaviors\AutoPopulateRegionBehaviorFixture.cs	✔️
Regions\Behaviors\BindRegionContextToDependencyObjectBehaviorFixture.cs	✔️
Regions\Behaviors\ClearChildViewsRegionBehaviorFixture.cs	✔️
Regions\Behaviors\DelayedRegionCreationBehaviorFixture.cs	✔️
Regions\Behaviors\RegionActiveAwareBehaviorFixture.cs	✔️
Regions\Behaviors\RegionManagerRegistrationBehaviorFixture.cs	✔️
Regions\Behaviors\RegionMemberLifetimeBehaviorFixture.cs	✔️
Regions\Behaviors\SelectorItemsSourceSyncRegionBehaviorFixture.cs	🔳 ⚠️
Regions\Behaviors\SyncRegionContextWithHostBehaviorFixture.cs	✔️

Tests - Prism.Container.Avalonia.Shared

File	Status	Notes
Fixtures\ContainerExtensionCollection.cs	✔️
Mocks\NullModuleCatalogBootstrapper.cs	✔️

Tests - Prism.DryIoc.Avalonia.Tests

TBD

File	Status	Notes

Conversion Helpers

[https://docs.avaloniaui.net/misc/wpf/Control-frameworkelement-and-control]

WPF	Avalonia	Reference
System.Windows	Avalonia
System.Windows.FrameworkElement	Avalonia.Controls.Control	Reference
System.WIndows.FrameworkContentElement	Avalonia.Controls.Control
UIElement	Avalonia.Controls.Control
ItemsControl.ItemsSource	Avalonia.Controls.ItemsControl.ItemsSource	Naming Convention
System.Windows.Markup.MarkupExtension	Avalonia.Markup.Xaml.MarkupExtension	Reference
System.Windows.Markup.ContentPropertyAttribute.ContentProperty	Avalonia.Metadata.Content	[AvaloniaUI/Avalonia#1126]
System.Windows.Markup	Avalonia.Markup.Xaml
System.Windows.Markup.XmlnsDefinition	Avalonia.Metadata.XmlnsDefinition
System.Windows.DependencyObject	Avalonia.AvaloniaObject
System.Windows.DependencyProperty	Avalonia.AvaloniaProperty
System.Windows.DependencyPropertyChangedEventArgs	Avalonia.AvaloniaPropertyChangedEventArgs
System.ComponentModel.DesignerProperties.GetIsInDesignMode(DependencyObject element);	Avalonia.Controls.Design.IsDesignMode;
System.Windows.Controls.Primitives.Selector	??	used by SelectorRegionAdapter.cs and PrismInitializationExtensions.cs
RoutedEventHandler	EventHandler

AvaloniaProperty vs DependencyProperty

Note, Avalonia places the propertyType as part of TValue in its ..<THost, TValue>(...).

// Avalonia
public static AvaloniaProperty AutoWireViewModelProperty =
    AvaloniaProperty.RegisterAttached<Control, bool>(
        name: "AutoWireViewModel",
        ownerType: typeof(ViewModelLocator),
        defaultValue: false);

// WPF
public static DependencyProperty AutoWireViewModelProperty =
    DependencyProperty.RegisterAttached(
        name: "AutoWireViewModel",
        propertyType: typeof(bool?),
        ownerType: typeof(ViewModelLocator),
        defaultMetaData: new PropertyMetadata(defaultValue: null, propertyChangedCallback: AutoWireViewModelChanged));

Behaviors and Triggers

In order to use Behaviors in Avalonia, you must download the Avalonia XAML Behaviors NuGet.

For example, InvokeCommandActionView.axaml uses InvokeCommandAction.cs.

Inheriting WPF DependencyObject in Avalonia

// WPF:
public partial class ItemMetadata : DependencyObject
{
    ...
    private static void DependencyPropertyChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs args)
    {
        ItemMetadata itemMetadata = dependencyObject as ItemMetadata;
        if (itemMetadata != null)
        {
            itemMetadata.InvokeMetadataChanged();
        }
    }

// Avalonia:
public class ItemMetadata : AvaloniaObject
{
    ...
    private static void StyledPropertyChanged(IAvaloniaObject dependencyObject, AvaloniaPropertyChangedEventArgs args)
    {
        ItemMetadata itemMetadata = dependencyObject as ItemMetadata;
        if (itemMetadata != null)
        {
            itemMetadata.InvokeMetadataChanged();
        }
    }

Property

Note:

• Avalonia places WPF's propertyType as part of TValue in <THost, TValue>
• The THost object type is what is used in the Get and Set methods.

// Avalonia ------------
private static readonly AvaloniaProperty ObservableRegionContextProperty =
    AvaloniaProperty.RegisterAttached<Visual, ObservableObject<object>>(
        name: "ObservableRegionContext",
        ownerType: typeof(RegionContext));

static RegionContext()
{
    ObservableRegionContextProperty.Changed.Subscribe(args => GetObservableContext(args?.Sender as Visual));
}

// WPF -----------------
private static readonly DependencyProperty ObservableRegionContextProperty =
    DependencyProperty.RegisterAttached(
        name: "ObservableRegionContext",
        propertyType: typeof(ObservableObject<object>),
        ownerType: typeof(RegionContext),
        defaultMetadata: null);

Property with Callback

Make sure to include, using System; or else .Subscribe(..) will throw an error.

using System;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Styling;

// Avalonia ------------------
static ClassConstructor()
{
    RegionNameProperty.Changed.Subscribe(args => OnSetRegionNameCallback(args?.Sender, args));
}

public static readonly AvaloniaProperty RegionNameProperty = AvaloniaProperty.RegisterAttached<AvaloniaObject, string>(
    name: "RegionName",
    ownerType: typeof(RegionManager));

// WPF -----------------------
public static readonly DependencyProperty RegionNameProperty = DependencyProperty.RegisterAttached(
    name: "RegionName",
    propertyType: typeof(string),
    ownerType: typeof(RegionManager),
    defaultMetadata: new PropertyMetadata(defaultValue: null, propertyChangedCallback: OnSetRegionNameCallback));