virtual studio set textblock text in code

VIRTUAL STUDIO SET TEXTBLOCK TEXT IN CODE CODE

The custom behavior class also overrides the OnAttached and OnDetaching methods of the non-generic Note that the generic type parameter of theīehavior base class specifies the type of element that the behavior can be attached to, in this case You will need to reference the from your application or class library.īelow is an example of a Blend behavior that defines its own SelectedItem dependency property to be bound to the source property of the view model. NET Framework but it is part of the Microsoft Expression Blend SDK that can be downloaded from Microsoft’s official website Note that this abstract base class doesn’t ship with the. You define a Blend behavior by creating a non-static class that derives from the

In the Expression Blend or Blend for Visual Studio tool. They are also more design friendly easily as they can be easily attached to visual elements in the UI via drag-drop functionality You typically define an attached behaviorĪs a static class with a set of static methods that get and set the value of the dependency property and perform the desired logic as a result of the callback being invoked.Ī Blend behavior provides a better way of encapsulating the functionality of a behavior compared to an ordinary attached behavior. If you are familiar with dependency properties and attached properties, an attached behavior is simplyĪn attached property with a Propert圜hangedCallback change handler attached to it that performs some action on or extends the DependencyObject to which it is attached when the value of the dependency property changes. There are basically two different ways of implementing these kind of behaviors in WPF, commonly referred to as attached behaviors and Blend behaviors.

VIRTUAL STUDIO SET TEXTBLOCK TEXT IN CODE CODE

A behavior is basically a piece of code that can be attached to some user element in the XAML markup of a view through attached properties and add functionality to this element. To solve issues like this, you can instead implement a custom behavior. Also, in some real-world cases it might not even be possible to add an additional property to a class for one reason This may not be an acceptable or particularly good solution. You also need to use recursion to iterate through the collection ofįileExplorerItem objects to find the particular item that is selected.

Note however that for this to work as expected, you need raise the Propert圜hanged event for the SelectedItem property of the view model whenever the IsSelected property of aįileExplorerItem object in the Items collection changes. To illustrate this scenario,Ĭonsider the following sample view model class that creates and exposes a collection ofįileExplorerItem objects that represent folders and files of a given root folder on the disk: Let’s assume that you are developing a WPF application using the Model-View-View Model (MVVM) design pattern and you want do display the details of some item in a ContentPresenter once it gets selected in a TreeView control. This article provides two different code samples on how you can use something called attached behaviors to be able to synchronize a source property of a view model class with a custom dependency property that acts as replacement for an existing read-onlyĭependency property of some user interface control. If you have ever tried to for example bind the SelectedItem property of a TreeView control or the SelectedDates property of a Calendar control to some source property of a view model, you know that these properties are read-only, i.e.

Virtual studio set textblock text in code