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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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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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3answers
26k views

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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4answers
21k views

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 ...
20
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6answers
13k views

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 ...
20
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5answers
8k views

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 ...
18
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1answer
4k views

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 ...
17
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3answers
10k views

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 ...
17
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2answers
13k views

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 ...
17
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5answers
22k views

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 ...
16
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2answers
10k views

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 ...
14
votes
4answers
918 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 ...
12
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3answers
6k views

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. ...
12
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2answers
1k views

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 ...
10
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3answers
11k views

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 ...
10
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3answers
18k views

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 ...
9
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1answer
2k views

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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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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3answers
26k views

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
7k 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 ...
8
votes
2answers
616 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 ...
8
votes
1answer
8k views

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 ...
7
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3answers
6k views

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 ...
7
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4answers
12k views

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 ...
6
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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 - ...
6
votes
3answers
916 views

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
votes
5answers
19k views

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 ...
6
votes
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
votes
1answer
5k 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
votes
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
1answer
5k 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
votes
2answers
545 views

Should I remove “everything” from my controller in MVVM?

I'm working with Xamarin and we are following the MVVM design pattern. For those who don't know what Xamarin is, it's a technology that allows us to build iOS and Android apps with shared code. ...
6
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2answers
2k 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 { ...
6
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3answers
801 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
votes
1answer
430 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
593 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 ...
5
votes
1answer
4k views

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 ...
5
votes
4answers
8k 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. ...
5
votes
4answers
432 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
2answers
6k 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 ...
5
votes
2answers
8k 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
202 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
votes
2answers
5k views

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 ...
5
votes
1answer
7k 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 ...
5
votes
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
votes
3answers
3k views

MVVM - child windows and data contexts

Should a child window have it's own data context (View-Model) or use the data context of the parent? More broadly, should each View have its own View-Model? Are there are any rules to guide making ...
5
votes
2answers
3k views

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 ...
5
votes
2answers
233 views

Returning a slimmed down domain entity from your view model

I'm wondering how to handle a ViewModel in the traditional sense, which includes both properties and methods, and another "view model" which is simply just the properties -- perhaps the ViewModel ...
5
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 ...
5
votes
1answer
5k views

Trying to learn how to use WCF services in a WPF app, using MVVM

We're working on a major re-write of a legacy VB6 app, into a WPF app. I've written several WCF services, which are meant to be used with the new WPF app. We want to use the MVVM design pattern to ...
5
votes
1answer
604 views

MVVM Persistence from view model

I'm new to MVVM, I get the general idea, but there's one thing that I've been having a tough time finding an answer for. Inevitably an application will have a save button in the UI. The UI talks to ...