Question

I am new with WPF and dependency properties and my question might be totally newbie…

I have the following dependency property:

    public static readonly DependencyProperty IsEditableProperty = 
        DependencyProperty.Register("IsEditable", typeof(bool), typeof(EditContactUserControl),
        new FrameworkPropertyMetadata(false, OnIsEditablePropertyChanged));

    public bool IsEditable
    {
        get { return (bool)GetValue(IsEditableProperty); }
        set { SetValue(IsEditableProperty, value); }
    }

    private static void OnIsEditablePropertyChanged(DependencyObject source, DependencyPropertyChangedEventArgs e)
    {
        EditContactUserControl control = source as EditContactUserControl;

        bool isEditable = (bool)e.NewValue;

        if (isEditable)
            control.stackPanelButtons.Visibility = Visibility.Visible;
        else
            control.stackPanelButtons.Visibility = Visibility.Collapsed;
    }

The problem is that I want to have the code in the OnIsEditablePropertyChanged to be executed also for the default value of my property, which doesn’t happen.

What am I doing wrong, or how should I do this in your opiniion?

Thank you in advance.

Answer 1

Instead of changing the visibility in code, you should Bind the Visibility property in XAML and use a boolean to Visibility Converter.

If you do this, it doesn’t matter if the property is initialized or not.