make-wpf-converter

WPF Converter Generator

If $0 is empty, use the AskUserQuestion tool to ask: "Enter the Converter name (e.g., BoolToVisibility, NullToVisibility)". Do NOT proceed until a valid name is provided. Use the response as the ConverterName for all subsequent steps.

Generate a $0Converter class with MarkupExtension pattern for direct XAML usage. If multi is appended to the arguments, generate IMultiValueConverter instead of IValueConverter.

• Replace {Namespace} with the project's root namespace detected from csproj or existing code.
• Replace {SourceType} and {TargetType} with the appropriate types based on the converter name (e.g., BoolToVisibility → bool, Visibility).
• Replace {Project} with the target project path.

Usage

# IValueConverter
/wpf-dev-pack:make-wpf-converter BoolToVisibility

# IMultiValueConverter
/wpf-dev-pack:make-wpf-converter AllTrue multi

---

Generated Code

Base Class (ConverterMarkupExtension.cs)

Create this base class first in your Converters folder:

namespace {Namespace}.Converters;

/// <summary>
/// Base class for converters that can be used directly in XAML without resource declaration.
/// </summary>
public abstract class ConverterMarkupExtension<T> : MarkupExtension, IValueConverter
    where T : class, new()
{
    private static readonly Lazy<T> _converter = new(() => new T());

    public override object ProvideValue(IServiceProvider serviceProvider)
    {
        return _converter.Value;
    }

    public abstract object? Convert(
        object? value,
        Type targetType,
        object? parameter,
        CultureInfo culture);

    public virtual object? ConvertBack(
        object? value,
        Type targetType,
        object? parameter,
        CultureInfo culture)
    {
        throw new NotSupportedException("ConvertBack is not supported.");
    }
}

Base Class (MultiConverterMarkupExtension.cs)

namespace {Namespace}.Converters;

/// <summary>
/// Base class for multi-value converters with MarkupExtension support.
/// </summary>
public abstract class MultiConverterMarkupExtension<T> : MarkupExtension, IMultiValueConverter
    where T : class, new()
{
    private static readonly Lazy<T> _converter = new(() => new T());

    public override object ProvideValue(IServiceProvider serviceProvider)
    {
        return _converter.Value;
    }

    public abstract object? Convert(
        object?[] values,
        Type targetType,
        object? parameter,
        CultureInfo culture);

    public virtual object?[] ConvertBack(
        object? value,
        Type[] targetTypes,
        object? parameter,
        CultureInfo culture)
    {
        throw new NotSupportedException("ConvertBack is not supported.");
    }
}