xaml-csharp-development-skill-for-avalonia

WPF Testing, Diagnostics, and Performance Regression Safety to Avalonia

Table of Contents

1. Scope
2. Validation Strategy Mapping
3. Diagnostics Mapping
4. Conversion Example
5. Avalonia C# Equivalent
6. Troubleshooting

Scope

This reference defines regression-control patterns for WPF-to-Avalonia migration: behavior parity, rendering stability, input correctness, and performance limits.

Validation Strategy Mapping

WPF migration risk	Avalonia validation approach
routed-input differences	focused key/pointer routing tests
binding regressions	typed binding + view-model tests
rendering regressions	visual snapshots and deterministic render scenarios
performance drift	profiling and UI-thread workload checks

Diagnostics Mapping

Use repository references for test/diagnostic workflows:

• ../26-testing-stack-headless-render-and-ui-tests.md
• ../27-diagnostics-profiling-and-devtools.md
• ../08-performance-checklist.md

Conversion Example

WPF behavior contract:

// Ctrl+S saves current document and keeps editor focus.

Avalonia XAML target:

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:vm="using:MyApp.ViewModels"
             x:DataType="vm:EditorViewModel">
  <UserControl.KeyBindings>
    <KeyBinding Gesture="Ctrl+S" Command="{CompiledBinding SaveCommand}" />
  </UserControl.KeyBindings>
  <TextBox Text="{CompiledBinding DocumentText, Mode=TwoWay}" />
</UserControl>

Avalonia C# Equivalent

using System;

public static class MigrationAssertions
{
    public static void AssertSaveIsExecutable(EditorViewModel vm)
    {
        if (!vm.SaveCommand.CanExecute(null))
            throw new InvalidOperationException("Save command must be executable.");
    }

    public static void AssertOnUiThread(bool isUiThread)
    {
        if (!isUiThread)
            throw new InvalidOperationException("UI mutation from non-UI thread.");
    }
}

Troubleshooting

1. migrated features pass basic tests but fail under load.
   • add dispatcher/async and large-data tests.
2. focus behavior diverges from WPF.
   • add explicit focus and keyboard navigation scenario tests.
3. large migration slices are hard to verify.
   • cut migration into smaller vertical slices with explicit parity gates.

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