Roslyn source generator to create dependency and attached properties for WPF, Xamarin.Forms, and .NET MAUI

Requirements

• Your class should be partial.
• If you create a dependency property (WPF) or bindable property (Xamarin.Forms & .NET MAUI), your class should inherit from System.Windows.DependencyObject or Xamarin.Forms.BindableObject or Microsoft.Maui.Controls.BindableObject according to the project type. Attached properties don't have this requirement.
• Bindables creates the static constructor for the class to initialize the dependency properties. If you have custom static constructor for a type, you can't use Bindables on it.

Example (WPF)

Check Types for Frameworks for other frameworks.

Your Code

using System.Windows;
using Bindables.Wpf;

public partial class YourClass : DependencyObject
{
    private static readonly string DefaultValue = "Test";

    [DependencyProperty(typeof(string))]
    public static readonly DependencyProperty RegularProperty;

    // You can use any visibility modifier.
    [DependencyProperty(typeof(string))]
    private static readonly DependencyPropertyKey ReadOnlyPropertyKey;

    [DependencyProperty(typeof(string), OnPropertyChanged = nameof(PropertyChangedCallback), DefaultValueField = nameof(DefaultValue), Options = FrameworkPropertyMetadataOptions.BindsTwoWayByDefault)]
    public static readonly DependencyProperty CustomizedProperty;

    private static void PropertyChangedCallback(DependencyObject obj, DependencyPropertyChangedEventArgs args)
    {
    }
}

Generated Code

// Generated by Bindables
using System.Windows;

#nullable enable

public partial class YourClass
{
    [global::System.CodeDom.Compiler.GeneratedCode("Bindables.Wpf.WpfPropertyGenerator", "1.4.1")]
    public string? Regular
    {
        get => (string?)GetValue(RegularProperty);
        set => SetValue(RegularProperty, value);
    }

    [global::System.CodeDom.Compiler.GeneratedCode("Bindables.Wpf.WpfPropertyGenerator", "1.4.1")]
    public static readonly DependencyProperty ReadOnlyProperty;

    [global::System.CodeDom.Compiler.GeneratedCode("Bindables.Wpf.WpfPropertyGenerator", "1.4.1")]
    public string? ReadOnly
    {
        get => (string?)GetValue(ReadOnlyProperty);
        private set => SetValue(ReadOnlyPropertyKey, value);
    }

    [global::System.CodeDom.Compiler.GeneratedCode("Bindables.Wpf.WpfPropertyGenerator", "1.4.1")]
    public string? Customized
    {
        get => (string?)GetValue(CustomizedProperty);
        set => SetValue(CustomizedProperty, value);
    }

    [global::System.CodeDom.Compiler.GeneratedCode("Bindables.Wpf.WpfPropertyGenerator", "1.4.1")]
    static YourClass()
    {
        RegularProperty = DependencyProperty.Register(
            nameof(Regular),
            typeof(string),
            typeof(YourClass),
            new FrameworkPropertyMetadata());

        ReadOnlyPropertyKey = DependencyProperty.RegisterReadOnly(
            nameof(ReadOnly),
            typeof(string),
            typeof(YourClass),
            new FrameworkPropertyMetadata());

        ReadOnlyProperty = ReadOnlyPropertyKey.DependencyProperty;

        CustomizedProperty = DependencyProperty.Register(
            nameof(Customized),
            typeof(string),
            typeof(YourClass),
            new FrameworkPropertyMetadata(DefaultValue, (FrameworkPropertyMetadataOptions)256, PropertyChangedCallback));
    }
}

Options

You can pass following options:

Option	Description
OnPropertyChanged	Name of the method that will be called when the property is changed.
OnCoerceValue (WPF)	Name of the method that will be called when the property is re-evaluated/coerced.
DefaultValueField	Name of the static field that will provide the default value for the property.
Options (WPF)	Pass System.Windows.FrameworkPropertyMetadataOptions to the dependency property.
BindingMode (Xamarin.Forms)	Pass Xamarin.Forms.BindingMode to the dependency property.
BindingMode (.NET MAUI)	Pass Microsoft.Maui.Controls.BindingMode to the dependency property.

Signature of OnPropertyChanged method should be:

Project Type	Signature
WPF	static void MethodName(DependencyObject obj, DependencyPropertyChangedEventArgs args)
Xamarin.Forms & .NET MAUI	static void MethodName(BindableObject obj, object oldValue, object newValue)

Signature of OnCoerceValue method should be:

Project Type	Signature
WPF	static object MethodName(DependencyObject obj, object value)
Xamarin.Forms & .NET MAUI	static object MethodName(BindableObject obj, object value)

Types for Frameworks

Project Type	Dependency Property Type	Access Type	Property Suffix	Field Type	Attribute Type
WPF	Dependency Property	Read/Write	Property	DependencyProperty	Bindables.Wpf.DependencyPropertyAttribute
WPF	Dependency Property	Read Only	PropertyKey	DependencyPropertyKey	Bindables.Wpf.DependencyPropertyAttribute
WPF	Attached Property	Read/Write	Property	DependencyProperty	Bindables.Wpf.AttachedPropertyAttribute
WPF	Attached Property	Read Only	PropertyKey	DependencyPropertyKey	Bindables.Wpf.AttachedPropertyAttribute
Xamarin.Forms	Bindable Property	Read/Write	Property	BindableProperty	Bindables.Forms.BindablePropertyAttribute
Xamarin.Forms	Bindable Property	Read Only	PropertyKey	BindablePropertyKey	Bindables.Forms.BindablePropertyAttribute
Xamarin.Forms	Attached Property	Read/Write	Property	BindableProperty	Bindables.Forms.AttachedPropertyAttribute
Xamarin.Forms	Attached Property	Read Only	PropertyKey	BindablePropertyKey	Bindables.Forms.AttachedPropertyAttribute
.NET MAUI	Bindable Property	Read/Write	Property	BindableProperty	Bindables.Maui.BindablePropertyAttribute
.NET MAUI	Bindable Property	Read Only	PropertyKey	BindablePropertyKey	Bindables.Maui.BindablePropertyAttribute
.NET MAUI	Attached Property	Read/Write	Property	BindableProperty	Bindables.Maui.AttachedPropertyAttribute
.NET MAUI	Attached Property	Read Only	PropertyKey	BindablePropertyKey	Bindables.Maui.AttachedPropertyAttribute