Questions tagged [mvvm]

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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10answers
30k views

Under what conditions is the use of MVVM appropriate?

Model View View-Model was developed by Microsoft to target UI development platforms which support event-driven programming, specifically Windows Presentation Foundation (WPF) and Silverlight on the ....
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Who should control navigation in an MVVM application?

Example #1: I have a view displayed in my MVVM application (let's use Silverlight for the purposes of the discussion) and I click on a button that should take me to a new page. Example #2: That same ...
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How to choose NOT to use a framework (Caliburn.Micro, etc.) in a given MVVM application?

I have once started a MVVM/WPF project, which was eventually built and deployed, and for that I studied a lot of the Caliburn.Micro MVVM Framework. The fact is: I ended up not using Caliburn.Micro for ...
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1answer
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Is there a good formal pattern to manage state in MVVM?

I have started learning about Redux and React in the web-world, and the more I learn about it the more I'm realizing how painful state management is in the desktop-world with WPF's MVVM-style ...
21
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6answers
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Should we bind view to a model property or ViewModel should have it's own..?

I am starting a project with following technical environment : .Net 4.0, Entity Framework 4.0, WPF with MVVM Architecture I saw lots of examples on the net, some books with this environment. In some ...
21
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5answers
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Are value converters more trouble than they're worth?

I'm working on a WPF application with views that require numerous value conversions. Initially, my philosophy (inspired in part by this lively debate on XAML Disciples) was that I should make the view ...
20
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2answers
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Is MVVM in WPF outdated? [closed]

I'm currently trying to get my head round MVVM for WPF - I don't mean get my head round the concept, but around the actual nuts and bolts of doing anything that is further off the beaten track than ...
19
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2answers
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Help with complex MVVM (multiple views)

I need help creating view models for the following scenario: Deep, hierarchical data Multiple views for the same set of data Each view is a single, dynamically-changing view, based on the active ...
18
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5answers
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How to make creating viewmodels at runtime less painful

I apologize for the long question, it reads a bit as a rant, but I promise it's not! I've summarized my question(s) below In the MVC world, things are straightforward. The Model has state, the View ...
17
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2answers
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Clean Architecture: What is the View Model?

In his book 'Clean Architecture', Uncle Bob says that the Presenter should put the data that it receives into something he calls the 'View Model'. Is this the same thing as the 'ViewModel' from the ...
17
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3answers
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MVVM, DDD, and WPF Layered Application Project Structure Guidance

I am trying to setup my application's structure in VS and I want to "try" and future proof it to a reasonable level. This application will be a WPF re-write of an old Winform app that had followed no ...
15
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3answers
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MVVM Clarification

We are about to write our first WPF application and are becoming familiar with the MVVM pattern. We've built many Winform applications and have an architecture that has been very successful for us. ...
14
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3answers
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MVVM and service pattern

I'm building a WPF application using the MVVM pattern. Right now, my viewmodels calls the service layer to retrieve models (how is not relevant to the viewmodel) and convert them to viewmodels. I'm ...
14
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4answers
967 views

Proper Model-View-_____ design

I've been reading up about Model View Controller, Model View Presenter, Model View ViewModel, and so on, and generally, the underlying concept seems pretty simple to understand: keep the pretty ...
13
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1answer
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Reactive programming vs MVVM pattern for managing GUI updates

Reactive programming and MVVM are two approaches that can address the problem of separating the domain layer from the UI. MVVM does this by defining a viewmodel, which is a data structure mapped to ...
11
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3answers
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MVVM or MVC? Want to use the same set of classes for WPF and ASP.NET

I am a newbie in terms of Design Patterns. I just started learning MVC when I am hearing a new buzz, MVVM. I want to learn the insights of both of these by redesigning an old inventory and invoicing ...
11
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2answers
11k views

In MVVM, should ViewModel or View be responsible for creating new views?

In my WPF application, I want to create a new view. Where should I do that - in ViewModel or Model? The application is a (very simple for now) one-window form-like tool with single "send" button. In ...
10
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1answer
8k views

Best practices for implementing MVVM and MVC in delphi Pascal

I'm a Delphi pascal programmer, I use the latest Embarcadero delphi XE, and I would like to take advantage of design patterns such as Model view controller and model view view-model. However, there ...
9
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1answer
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Value of MVVM in a Line of Business Application (and a Rant of Current Development Practices)

After 2 years, I'm still struggling with MVVM as a practical method of producing working software. In some cases it's great. I did a multithreaded application that controlled a small assembly line ...
9
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3answers
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What the best way to wire up Entity Framework database context (model) to ViewModel in MVVM WPF?

As in the question above: What the best way to wire up Entity Framework database model (context) to viewModel in MVVM (WPF)? I am learning MVVM pattern in WPF, alot of examples shows how to implement ...
8
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2answers
628 views

How can I “get in the know”?

My company posted a job listing to get me a helper. A recruiter called me today and all he kept saying was "MVC this Entity Framework that..." - He sounded shocked when I said the project uses ...
7
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4answers
2k views

Clean, Modular Code vs MV* Frameworks [closed]

I've been hearing a lot about the "new" MV* frameworks. I've tinkered with KnockoutJS (I created an invoicing application), but I much prefer to write clean, modular code in raw JavaScript - ...
7
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5answers
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MVVM ViewModel and Commands

I need a bit of help to understand the relationship between a viewmodel and a command, and the responsibility of the viewmodel. I'll try to give an example (using Caliburn Micro). I have a viewmodel ...
7
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2answers
8k views

C# .NET MVVM software architecture and naming conventions

I am currently working on a software using C# .NET and WPF with the MVVM pattern. Though the software is almost done, I have been discussing our architecture for a long time and I would like to get ...
7
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4answers
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How to organize MVVM files in solution

I'm fairly new to the MVVM concept but like a lot of the flexibility it gives me so far. However, I'm struggling to find a good way to manage my code. I have several classes that are just sitting in ...
7
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3answers
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MVVM Commands - one command for everything or multiple commands?

In my last company, on handling view commands, in the ViewModelBase there were one central command implemented, like public ICommand ToolCommand { get; set; } And in the ViewModelBase, it's been ...
6
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3answers
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What are the rules for coupling a ViewModel and a View in the MVVM pattern?

So given the Separation of Concerns, how coupled should the View and ViewModel be? For example, I want the visibility of a Control in the View to be databound (databinded?) to a flag in the ViewModel....
6
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1answer
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Wpf: Event driven vs MVVM design pattern

I'm a beginning coder and I've been working on a WPF app for several months now and struggled to implement anything in MVVM due to time constraits to learn so I coded my program the only way to knew ...
6
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4answers
7k views

Who is using the MVVM architecture for large applications? [closed]

I am currently working on an LOB application which I am basing on the MVVM architecture. Going by the answers to the questions I'm asking, it seems like there are not that many people building large ...
6
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4answers
9k views

Lists & Collections in MVVM - which approach to take?

I'm currently working on a Silverlight app using Caliburn.Micro. At present, we have Views (eg: PeopleView) and View Models (eg: PeopleViewModel) that equate to 'pages' of the application. ...
6
votes
1answer
10k views

Mapping Domain models to ViewModel

I have an Asp.net MVC5 application structured like this: Core Domain project Infrastructure DAL project Utilities UI UI project (contains ViewModel at the moment, will probably put that into ...
6
votes
1answer
6k views

WPF, MVVM, EF, POCO guidance required on simple architecture

(sorry for my poor english) I am developing a application using WPF, EF Code First using MVVM (Caliburn.Micro). It should be used mostly to CRUD work. I created a BaseViewModel<T> class from ...
6
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2answers
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MVVM Reporting App Approach ? Data Access Layer?

I'm trying to follow the MVVM pattern in a reporting / statistics application that I'm making in C# / WPF. I have made many model classes to hold properties as a starting point. Some of these models ...
6
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1answer
4k views

Which notification pattern is preferable?

I'm working on a view model for a view that presents a dialog with export options. The user selects options then clicks Export. When the view model completes the Export, the calling view model ...
6
votes
2answers
2k views

Should Item Grouping/Filter be in the ViewModel or View layer?

I'm in a situation where I have a list of items that need to be displayed depending on their properties. What I'm unsure of is where is the best place to put the filtering/grouping logic of the ...
6
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1answer
8k 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 ...
6
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2answers
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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 { ...
6
votes
3answers
914 views

Modular Filter Architecture for WPF

I am creating a little stock-management tool for private use. I have different views, which need similar but different filters. As an example I have a "current stock" list where I can filter for ...
6
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1answer
447 views

Design patterns for navigation between pages on mobile platforms

I'd like to ask you about the best way of handling navigation between pages/activities on mobile platforms. To be more specific - about handling state in more complex apps, about handling 'Back' ...
6
votes
2answers
607 views

Given the presentation model pattern, is the view, presentation model, or model responsible for adding child views to an existing view at runtime?

I am building a Flex 4 based application using the presentation model design pattern. This application will have several different components to it as shown in the image below. The MainView and ...
6
votes
2answers
2k 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. ...
5
votes
3answers
5k views

What are the pros and cons of the MVVM architecture? [closed]

In class today we were introduced to the MVVM architecture for Silverlight/WinPhone/WPF; it looks nice for big projects, but what are your thoughts on MVVM? What are the pros and cons? I want to get ...
5
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1answer
2k views

Who is responsible for setting color in MVVM?

I have an iOS app where after exceeding a certain limit, part of the user interface changes a color to alert the user. I'm using MVVM to accomplish this and division of labor looks like this: Model - ...
5
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4answers
439 views

What determines when an application requires mvvm?

I'm developing mobile applications for Windows Phone 7. This application calls some web services and occasionally sends responses out via web services. I recently started looking into MVVM and noticed ...
5
votes
3answers
581 views

How to avoid duplication of types in MVVM

I'm learning the MVVM pattern and something that comes up often is a duplication of data-types. Say I have a Person datatype. Intuitively I want it to look like this: public class Person { ...
5
votes
2answers
9k views

What are the best practices for exception handling in n-tier applications?

What are the best practices for exception handling in n-tier applications? The application is a fat client based on MVVM pattern with .NET framework.
5
votes
2answers
284 views

Should I create a (new) project for shared UserControls?

Context: I'm creating some applications to help me on my daily tasks, it does not connect anywhere and the only "data" it has to deal with is the parameters that I enter on the input fields. This is ...
5
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3answers
4k views

How to use a MessageBox using the MVVM pattern?

I am implementing a UI application using the MVVM design-pattern. The thing is, sometimes when you detect that something is wrong with data that was inputted by the user, you'd like to notify him ...
5
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1answer
3k views

Usage of MVVM in iOS

I'm an iOS developer and I'm guilty of having Massive View Controllers in my projects so I've been searching for a better way to structure my projects and came across the MVVM (Model-View-ViewModel) ...
5
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2answers
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Is a 'God' ViewModel desired in WPF

My application has user controls within user controls. Please see a screen shot of one of the most beautiful applications of all time (UC = user control): All the properties live in the MainWindow ...

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