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.
276
questions
49
votes
10
answers
32k
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 ....
- 599
39
votes
3
answers
31k
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 ...
- 2,915
33
votes
4
answers
35k
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 ...
- 1,048
31
votes
1
answer
10k
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 ...
- 1,053
25
votes
2
answers
13k
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 ...
- 401
24
votes
2
answers
20k
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 ...
- 622
22
votes
6
answers
18k
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 ...
- 851
22
votes
5
answers
9k
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 ...
- 676
20
votes
2
answers
18k
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 ...
- 3,727
18
votes
5
answers
28k
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 ...
- 849
17
votes
3
answers
9k
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. ...
- 273
17
votes
3
answers
12k
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 ...
15
votes
3
answers
25k
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 ...
- 153
14
votes
4
answers
1k
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 ...
- 149
13
votes
2
answers
15k
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 ...
- 356
13
votes
3
answers
21k
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 ...
- 4,378
13
votes
5
answers
14k
views
WPF UserControl Reuse With MVVM
I'm struggling to find an elegant and idiomatic way of coding the following scenario using the MVVM paradigm in WPF and was wondering how other people would approach it.
I have a UserControl in my ...
- 353
13
votes
1
answer
10k
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 ...
- 7,980
11
votes
1
answer
9k
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 ...
- 225
10
votes
3
answers
28k
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 ...
- 103
10
votes
1
answer
3k
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 ...
- 201
9
votes
2
answers
11k
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 ...
8
votes
2
answers
4k
views
In MVVM, how much of the business logic should reside in the View Model, and how much should reside in the Model?
I wondered what is the "correct" or "intended" interpretation of MVVM?
I worked mainly with WPF but I guess it is still relevant to all platforms embracing MVVM architectural ...
- 275
8
votes
2
answers
651
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 ...
- 5,573
8
votes
1
answer
8k
views
The right place for "app logic" in MVVM context
I hope this is the right place to ask.
I'm an experienced developer, and have used MVC for much time.
This question is in the context of iOS/macOS development for the most part, (SwiftUI).
Using MVC ...
- 191
8
votes
1
answer
5k
views
Is ViewModel with more than one repository bad?
I'm working on a project with MVVM.
Some ViewModels have more than one repository.
Is ViewModels with more than one repository bad?
Please provide with why it's good/bad.
- 11k
7
votes
4
answers
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 - ...
- 181
7
votes
5
answers
24k
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 ...
- 321
7
votes
4
answers
25k
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 ...
- 173
7
votes
3
answers
2k
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
{
...
- 201
7
votes
1
answer
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 ...
- 676
7
votes
1
answer
6k
views
Why can’t ViewModels communicate with each other?
Can someone explain concretely why it is not desirable for ViewModels to communicate directly with other view models? It seems to me that for virtually any UX application there will be a “root” view (...
- 171
6
votes
3
answers
1k
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....
- 239
6
votes
1
answer
5k
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 ...
- 101
6
votes
4
answers
8k
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 ...
- 2,466
6
votes
3
answers
10k
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 ...
user235271
6
votes
4
answers
10k
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.
...
- 250
6
votes
1
answer
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 ...
- 163
6
votes
2
answers
4k
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 ...
- 163
6
votes
1
answer
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) ...
- 391
6
votes
2
answers
6k
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 ...
- 662
6
votes
1
answer
9k
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 ...
- 161
6
votes
2
answers
3k
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 ...
- 1,189
6
votes
1
answer
1k
views
Approach for Constructing View Models in Complex MVVM Application
I'm struggling with the design in a WPF MVVM application. In a few courses I've taken, they say that having a lot of parameters in a constructor is a code smell, but they never address how to deal ...
- 169
6
votes
2
answers
3k
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 {
...
- 1,043
6
votes
3
answers
4k
views
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 _model....
- 5,702
6
votes
3
answers
1k
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 ...
- 173
6
votes
1
answer
471
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' ...
- 61
6
votes
2
answers
643
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 ...
- 1,026
6
votes
3
answers
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. ...
- 444