XAML Completion Boost

Bring Rider-like XAML completion helpers to Visual Studio. XAML Completion Boost fills in the discrete-value suggestions that Visual Studio often misses, making enums, booleans, static members, element references, and design-time types feel much closer to the completion experience you get in Rider.

✨ Highlights

🧩 MarkupExtension Constructor Completion

When a MarkupExtension-derived type exposes constructor parameters backed by enums or booleans, the extension offers a value completion list at the argument position.

• Supports enum values and True / False
• Supports constructors with multiple positional parameters
• Matches the active completion list to the parameter currently being edited
• Shows the same enum value documentation in completion item descriptions and hover tooltips when available

<TextBlock Text="{local:MyExtension Active}" />

⚡ x:Static Static Member Completion

Adds richer completion for x:Static references.

• Suggests namespace prefixes from the current XAML file
• Suggests types under the selected namespace
• Suggests enum values, fields, properties, and other static members on the selected type
• Shows XML documentation comments for static members in completion item descriptions and hover tooltips

<TextBlock Text="{x:Static local:StatusKind.Active}" />

🔗 x:Reference Element Name Completion

Completes element names when writing x:Reference.

• Supports x:Name
• Supports Name
• Works in common scenarios such as Binding Source={x:Reference ...}

<TextBox x:Name="SearchBox" />
<TextBlock Text="{Binding Text, Source={x:Reference SearchBox}}" />

🎨 d:DesignInstance Type Completion

Improves design-time type selection for d:DesignInstance.

• Suggests all namespaces referenced by the current XAML file
• Suggests all types under the selected namespace
• Makes design-time DataContext setup faster and less string-driven

<Grid d:DataContext="{d:DesignInstance local:MainViewModel}" />

🎯 DataTrigger / MultiDataTrigger Value Completion

Suggests values for trigger conditions when the binding target can be inferred as an enum or boolean.

• Supports DataTrigger.Value
• Supports Value inside MultiDataTrigger conditions
• Infers enum or boolean values from the binding path
• Shows enum value documentation in completion item descriptions and hover tooltips when available

<DataTrigger Binding="{Binding State}" Value="Active">
    ...
</DataTrigger>

📝 Completion Lists And Tooltips

The extension uses the same metadata pipeline for completion lists and tooltips, so documentation is consistent between selecting a value and hovering over an existing value.

• Completion item descriptions show enum member comments, DescriptionAttribute values, static member XML documentation, and resolved enum values when available.
• Hover tooltips are available for x:Static static members, custom MarkupExtension enum arguments, and enum values used by DataTrigger / MultiDataTrigger.
• Tooltip content is intentionally limited to values the extension can already resolve for completion.

💡 When It Helps

XAML Completion Boost is useful when you frequently write WPF XAML and want fewer hand-written strings in scenarios like:

• Custom MarkupExtension types with constructor arguments
• Enum or boolean values in XAML
• Static member references through x:Static
• References to named elements in the current XAML file
• Design-time DataContext setup with d:DesignInstance