WPF usercontrol Twoway binding Dependency Property

Question

I created a Dependency Property in the usercontrol, but however changes in the usercontrol was NOT notified to the Viewmodel

Usercontrol

Answer 1

Bind the TextBox.Text property in the UserControl to its SampleProperty like this:

Now you could simply remove your OnSamplePropertyChanged callback.

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You might also register SampleProperty to bind two-way by default like this:

public static readonly DependencyProperty
    SamplePropertyProperty = DependencyProperty.Register(
        "SampleProperty", typeof(string), typeof(UserControl1),
        new FrameworkPropertyMetadata(
            null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));