The Model View ViewModel (MVVM) is an architectural pattern used in software engineering that originated from Microsoft as a specialization of the presentation model design pattern introduced by Martin Fowler.

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When using MVVM, should you create new viewmodels, or swap out the models?

Say I have a viewmodel like this: public class EmployeeViewModel { private EmployeeModel _model; public Color BackgroundColor { get; set; } public Name { get { return ...
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1answer
338 views

Loose Coupling Presenter to View in MVP

We work in a Java shop here and our web application uses an implementation of the MVP architectural pattern. Our manager comes from a .NET world, where he has been exposed to the MVVM design pattern. ...
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162 views

MVVM - Master Detail interaction scenarios - Implementing when MasterVm has partial data, and Detail has to pull whole entity

I primarily work with .Net WPF MVVM applications. I've used several frameworks, MVVM Light, Prism, etc, and I've been able to break the implementation of CRUD MVVM into three scenarios. Scenario 1: ...
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0answers
104 views

Why should ViewModel route actions to Controller when using the MVCVM pattern?

When reading examples across the Internet (including the MSDN reference) I have found that code examples are all doing the following type of thing: public class FooViewModel : BaseViewModel { ...
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0answers
43 views

Is it improper to have an application wide source for dropdown binding

The WPF Combobox needs to bind a collection to it's ItemsSource and something to bind the selected item or value to. Until now, I've included both the collection and the selected value properties that ...
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0answers
144 views

Best Practice Method for Including Images in a DataGrid using MVVM

All, I have a WPF DataGrid. This DataGrid shows files ready for compilation and should also show the progress of my compiler as it compiles the files. The format of the DataGrid is Image|File ...
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0answers
57 views

Encapsulate multiple properties into a single class to use as a custom DependencyProperty

My application is a WPF project implemented in C# .NET (4.5) using an MVVM architecture with no code-behind in the View. In order to eliminate the coupling between the View and the ViewModel I'm ...
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0answers
225 views

What's the best way to expose a Model object in a ViewModel?

In a WPF MVVM application, I exposed my model object into my viewModel by creating an instance of Model class (which cause dependency) into ViewModel. Instead of creating separate VM properties, I ...
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64 views

How to use data shaped by the UI from the ViewModel while keeping concerns separated?

I'm coming from a winforms background and trying to get ahold of MVVM and XAML. Right now I'm wondering how I can take advantage from a data-shaping control (either native or provided by a third ...
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0answers
88 views

WPF Control Lifeycle and Navigating through Containers to set Focus

I wanted to understand a control's lifecycle in WPF. Let me explain my scenario: I have a complex screen containing various container controls hosting forms. Let's say my screen has 3 Accordion ...
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27 views

Create a subclass of model for class-based viewmodel creation

Is it justified to create a model subclass just for creation of appropriate viewmodel based on this class. Am I missing something? How to pass data about model into viewmodel?
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67 views

Inputs and outputs to a method mixed in the UI

I am designing the front end of an WPF application using MVVM where basically all we are doing (for now) is calling a method with some inputs and displaying the outputs. There are two types of ...
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0answers
180 views

Should you implement a repository pattern with an MVVM javascript framework?

When coding a MVVM pattern I use Dependency Injection (DI) and try and code against interfaces. One of the common patterns is a Repository pattern, so I can swap my data storage provider. If I'm ...
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0answers
53 views

MVVM / API design: who is responsible for what in the example inside?

Note: this question is about the MVVM pattern in general and not related to any specific MVVM framework. I am wondering what the best design approach for the requirements below is (hypothetical ...
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0answers
359 views

wpf and mvvm printing report startegy

I am developing a WPF application and I need some clarity on printing in WPF and MVVM (I am using MVVM-Light). I want to create standard looking reports for my application and I don't want to have to ...