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

Usage

Define a field with type Dependency Property Type below and give it a name that ends with Property Suffix. Then, add Attribute Type attribute to the field and pass the type of the property you want to create. Possible values are:

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`

Options

You can pass following options via the attributes:

Option	Description
`OnPropertyChanged`	Name of the method that will be called when the property is changed.
`DefaultValueField`	Name of the static field that will provide the default value for the property.
`Options` (WPF only)	Pass `System.Windows.FrameworkPropertyMetadataOptions` to the dependency property.
`BindingMode` (Xamarin.Forms only)	Pass `Xamarin.Forms.BindingMode` to the dependency property.

Signature of OnPropertyChanged method should be:

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

Requirements

Your class should be partial.
If you create a WPF dependency property or Xamarin.Forms bindable property, your class should inherit from System.Windows.DependencyObject or Xamarin.Forms.BindableObject. 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

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;

public partial class YourClass
{
    public string Regular
    {
        get => (string)GetValue(RegularProperty);
        set => SetValue(RegularProperty, value);
    }

    public static readonly DependencyProperty ReadOnlyProperty;

    public string ReadOnly
    {
        get => (string)GetValue(ReadOnlyProperty);
        private set => SetValue(ReadOnlyPropertyKey, value);
    }

    public string Customized
    {
        get => (string)GetValue(CustomizedProperty);
        set => SetValue(CustomizedProperty, value);
    }

    static YourClass()
    {
        RegularProperty = DependencyProperty.Register(
            nameof(Regular),
            typeof(string),
            typeof(YourClass),
            new PropertyMetadata());

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

        ReadOnlyProperty = ReadOnlyPropertyKey.DependencyProperty;

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