Is there a way to specify a custom dependency property's default binding mode and update trigger?

问题

I would like to make it so that, as default, when I bind to one of my dependency properties the binding mode is two-way and update-trigger is property changed. Is there a way to do this?

Here is an example of one of my dependency properties:

public static readonly DependencyProperty BindableSelectionLengthProperty =
        DependencyProperty.Register(
        "BindableSelectionLength",
        typeof(int),
        typeof(ModdedTextBox),
        new PropertyMetadata(OnBindableSelectionLengthChanged));

回答1:

When registering the property, initialize your metadata with:

new FrameworkPropertyMetadata
{
    BindsTwoWayByDefault = true,
    DefaultUpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged
}

回答2:

In the Dependency Property declaration it would look like this:

public static readonly DependencyProperty IsExpandedProperty = 
        DependencyProperty.Register("IsExpanded", typeof(bool), typeof(Dock), 
        new FrameworkPropertyMetadata(true,
            FrameworkPropertyMetadataOptions.BindsTwoWayByDefault,
            OnIsExpandedChanged));

public bool IsExpanded
{
    get { return (bool)GetValue(IsExpandedProperty); }
    set { SetValue(IsExpandedProperty, value); }
}

来源：https://stackoverflow.com/questions/2663965/is-there-a-way-to-specify-a-custom-dependency-propertys-default-binding-mode-an