xaml-csharp-development-skill-for-avalonia

WinUI UserControl and CustomControl to Avalonia UserControl and TemplatedControl

Table of Contents

1. Scope and APIs
2. Concept Mapping
3. Conversion Example
4. Migration Notes

Scope and APIs

Primary WinUI APIs:

• UserControl, CustomControl, OnApplyTemplate, TemplatePart

Primary Avalonia APIs:

• UserControl, TemplatedControl, OnApplyTemplate, TemplatePartAttribute

Concept Mapping

WinUI idiom	Avalonia idiom
WinUI control/template/state pipeline	Avalonia control theme/style/selector pipeline
x:Bind or {Binding} data flow	{CompiledBinding ...} and typed x:DataType flow
WinUI layout/render invalidation model	Avalonia InvalidateMeasure/InvalidateArrange/InvalidateVisual model

Conversion Example

WinUI XAML:

<Page
    x:Class="MyApp.Views.SamplePage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:MyApp.Controls">
  <local:MetricCard Value="{x:Bind ViewModel.Value}" />
</Page>

WinUI C#:

var view = new MetricCard();

Avalonia XAML:

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:vm="using:MyApp.ViewModels"
             xmlns:local="using:MyApp.Controls"
             x:DataType="vm:SampleViewModel">
  <local:MetricCard Value="{CompiledBinding Value}" />
</UserControl>

Avalonia C#:

var metricCard = new MetricCard { Value = viewModel.Value };

Migration Notes

1. Start by porting behavior and state contracts first, then restyle and retune visuals.
2. Prefer typed compiled bindings and avoid reflection-heavy dynamic binding paths.
3. Keep UI-thread updates explicit when porting WinUI async/event flows.

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