Question

Is there a way to bind to a dependency property in C# (like XAML does)?

I know I can do change notification, but I was hoping for a way to do a “Two Way” binding. (So that changing my value changes the dependency property.)

Example:

In my User Control View

public static readonly DependencyProperty IsRequiredProperty =
    DependencyProperty.Register("IsRequired", typeof(bool), 
        typeof(MyUserControl), new FrameworkPropertyMetadata(default(bool)));

public bool IsRequired
{
    get { return (bool)GetValue(IsRequiredProperty); }
    set { SetValue(IsRequiredProperty, value); }
}

In My View Model:

 // This is the one I want bound to the dependency property.
 bool IsRequired { //INotifyPropertyChanged getter and setter}

 public void SomeCommandExec(Object obj)
 {
     // Update the dependency property by doing this:
     IsEnabled = False;
 }

Answer 1

You can do this in C# – you have to build a Binding manually:

// You need these instances
var yourViewModel = GetTheViewModel();
var yourView = GetYourView();

Binding binding = new Binding("IsRequired");
binding.Source = yourViewModel;
binding.Mode = BindingMode.TwoWay;
yourView.SetBinding(YourViewType.IsRequiredProperty, binding);

For details, see How To: Create a Binding in Code.