xaml-csharp-development-skill-for-avalonia

WinUI Toast, InfoBadge, and In-App Notifications to Avalonia

Table of Contents

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

Scope and APIs

Primary WinUI APIs:

• AppNotificationManager, AppNotification, InfoBadge, InfoBar

Primary Avalonia APIs:

• WindowNotificationManager, Notification, NotificationType, in-view badge composition

Concept Mapping

WinUI idiom	Avalonia idiom
OS toast via AppNotificationManager	platform integration or app-level notification service
InfoBar inline surface	banner-like Border + styles or notification card
InfoBadge control	lightweight badge composition in XAML
notification severity	NotificationType (Information, Success, Warning, Error)

Conversion Example

WinUI XAML:

<StackPanel Spacing="8">
  <InfoBadge Value="3" />
  <InfoBar IsOpen="True" Severity="Warning" Title="Unsaved changes" />
</StackPanel>

WinUI C#:

var appNotification = new AppNotification("<toast><visual><binding template='ToastGeneric'><text>Build complete</text></binding></visual></toast>");
AppNotificationManager.Default.Show(appNotification);

Avalonia XAML:

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:vm="using:MyApp.ViewModels"
             x:DataType="vm:NotificationsViewModel">
  <StackPanel Spacing="8">
    <Border Classes="badge" MinWidth="20" Padding="6,2">
      <TextBlock Text="{CompiledBinding UnreadCount}" HorizontalAlignment="Center" />
    </Border>

    <Border Classes="warning-banner" IsVisible="{CompiledBinding HasWarning}" Padding="8">
      <TextBlock Text="Unsaved changes" />
    </Border>
  </StackPanel>
</UserControl>

Avalonia C#:

var manager = new WindowNotificationManager(topLevel)
{
    Position = NotificationPosition.BottomRight,
    MaxItems = 4
};

manager.Show(new Notification("Build complete", "Artifacts were published.", NotificationType.Success));

Migration Notes

1. Model toast and in-app notifications as separate concerns in cross-platform apps.
2. Use WindowNotificationManager for deterministic in-app messaging across platforms.
3. Replace InfoBadge with a styled badge component bound to count/state.

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