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The CanExecute method is queried by the framework and returns a Boolean value that indicates whether the command can currently be executed.

ANYLOGIC TUTORIAL INJECT WINDOWS

A command in Windows Runtime implements the ICommand interface, in which the two important methods are Execute and CanExecute, both accepting an object as an argument. Commands such as Open, Save, Cut, Copy or Paste can then be data bound from the ViewModel to the View. Figure 1 illustrates the MVVM pattern.Ĭommands are framework-specific representations of what is to be done rather than when something is to be done (as with an event).

The data can be any domain, business or entity object and can include everything that can be retrieved from the available services or framework APIs. The Model can be any form of data that is presented in a View. The conversion can often be made directly within the ViewModel before returning the value from a property. The ViewModel often communicates directly with the Model through methods, properties or events.Ī ViewModel reduces the need for explicit binding converters. These bindings can be either a one-way communication from the ViewModel to the View or a two-way communication in which data received in the View is also propagated down to the ViewModel. In most cases, the View communicates with the ViewModel through bindings to properties and commands.

You can pair a View with its ViewModel manually, but some MVVM frameworks connect them for you by using some kind of inversion of control (IoC) container. There is often a one-to-one relationship between a specific View and its ViewModel, and the ViewModel is preferably set as the DataContext for the whole View. The ViewModel often wraps or projects some of the information from the Model, but it also contains view-specific logic that doesn’t belong in the Model, such as an IsSelected property. The ViewModel is the glue that holds the View and the Model together it’s also the only entity allowed to communicate with both of them.

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In such cases, I think it’s okay to put code in the View-as long as it isn’t vital to test or reuse. In some scenarios, however, such as when closing a window, putting view-specific logic in the ViewModel isn’t possible or is cumbersome.

In pure MVVM, the View’s code-behind file shouldn’t contain any logic other than in its markup (for example, triggers and visual state changes). The View can be anything graphical, from a window, user control or page to a simple DataTemplate that presents the ViewModels bound to an ItemsControl, such as a ListBox or a ComboBox. The ViewModel should be as general as possible so that you can easily interchange different Views. The View is a graphical presentation of the ViewModel. The following sections describe the various components of MVVM. The MVVM pattern is all about cleanly separating the view, its logic and the model in order to create an architecture that is maintainable, scalable and testable. MVVM is a common and popular pattern used in developing apps for WPF/Silverlight, Windows Phone 7 and Windows Store. (Those of you familiar with MVVM can skip right to the tutorials.) If you want to know about MVVM in more detail than what I provide, you can easily find a wealth of information on the Web. To get the most out of this article, you should have some knowledge of the MVVM pattern.

Before getting to the tutorials, however, I want to briefly review some of the key concepts of the MVVM pattern. The bulk of this article consists of two tutorials: one for setting up a new project using the Model-View-ViewModel (MVVM) pattern and one for using MVVM navigation. I assume you’ve read Part 1 this article continues where that one left off and is a lot more practical than the first. This is my second article for Windows Presentation Foundation (WPF) and Silverlight developers who want to start creating Windows Store apps without compromising on architecture. Volume 28 Number 03 Windows Store Apps - Windows Store Apps: A Guide for WPF and Silverlight Developers, Part 2

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