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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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Adding model into another view model's collection

The Setup So I'm working on a project in which there exists a MainViewModel class. This MainViewModel contains a list of Soldiers through an observable collection. I have a button in the MainView ...
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1answer
1k 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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1answer
508 views

MVVM viewmodel to view correlation in adaptive UI

I am making an mvvm application for the uwp platform and I am looking for advice on the following matter. Take for example the windows 10 e-mail application, which when full screen displays both the ...
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1answer
62 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 (...
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1answer
510 views

MVVM with DI, view model location and shared service data

I have a couple of questions regarding MVVM view models. I have 3 view models in my scenario, which I have put together a shorter sample below. I was looking for a nice solution for 3 views working ...
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1answer
109 views

Promise in Web MVVM

In MVVM (or Presentation Model), my (web) view listens to a CLICK event and calls a function of the Presentation Model to ask for the result. To clarify, the presentation model lives browser-side. ...
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1answer
118 views

MVC / MVVM principles

I'm currently working on updating some old projects (inherited stuff) and I keep running into various small issues with the architecture. Namely monolithic classes too tightly coupled. One example ...
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0answers
89 views

Propagating Data to multiple ViewModels - C#

I'm a bit new to MVVM, but here's my dilemma: I have a model (or models, but let's keep it simple) I want to show that model data on multiple different views. Ok, so ViewModel for each view gets ...
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0answers
3k views

Should UserControl's be Views in an XAML MVVM application (WPF or Store app)?

I am about to use Caliburn.Micro for a new XAML Store app (not sure what to call it nowadays - does not appear to be called a "Windows Store app" any longer). The documentation (see Simple Navigation ...
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0answers
1k 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
514 views

Hierarchical ViewModels and tracking IsDirty/PropertyChanged events

I have a set of ViewModels depicted like in the below picture. And, I have a couple of commands AcceptCommand, CancelCommand in the Top Level View Model that are bound to Apply, Cancel buttons ...
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0answers
1k 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 Path |...
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0answers
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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 party)...
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0answers
41 views

When not to use View Services in MVVM design pattern?

I'm using the MVVM design pattern in my application which is comprised of, A Xamarin.IOs project (View Layer) A Net Standard project (Common Layer) A Xamarin.Android project (in the future) (View ...
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0answers
47 views

How does “redux” decouple the different components so they can be tested separately in unit tests?

In the past we saw a big move from traditional MVC to MVVM for user interfaces: One of the primary motivations for MVVM is that the view and viemmodel are competely indepedently of each other and ...
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0answers
760 views

Proper implementation of Repository Pattern with MVVM in WPF

I am currently refactoring a WPF application that is built on the principles of the Repository Pattern. It uses Entity Framework as its ORM, and is Database First. Each of those entities is wrapped by ...
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0answers
989 views

MVVM approach to mahapps.metro Dialogs

I want to use a ShowMessageAsync method, but, at first sight, there is no obvious way to do ViewModel binding, even though there are already a certain number of answers and examples about this. Now, ...
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0answers
615 views

How to manage dbContext in a multi-user application?

I put together my first line-of-business app using WPF/MVVM/EF6(db-first)/MSSQL and realised that multiple users could not see each others' changes because I was using one dbcontext and keeping it ...
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0answers
301 views

Should my combobox for boolean values be in code-behind or in my viewmodel?

I ran into a disagreement with a coworker of mine on the implementation of representing a Boolean value in a ComboBox using Xaml and MVVM. Currently, my viewmodel is very simple. I have a bool? which ...
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0answers
126 views

Single page application automatically download dependent HTML

I'm currently developing an application using ASP.NET MVC5 and Knockout. For now, the typical architecture is this: FooController.cs: public ActionResult GetFoos(){ //... var model = // ...
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0answers
15 views

Xamarin.Forms and Prism NavigationParameters implementation

I am developing a Xamarin Forms project and use Prism Library as tool to implement the MvvM pattern. I have two views: PersonViewModel: Summary and has Edit button PersonEditViewModel: Details, and ...
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0answers
118 views

MVVM composite ViewModel for sharing fuctionality (instead of inheritance)

I'm looking for design ideas for something like a composite ViewModel. I'm facing a situation where a lot of ViewModels need CRUD operations and some need refresh operations. A minority of ViewModels ...
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0answers
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Where to keep the code for new instance of an object in iOS project?

Example: There is a KingDetailViewController class with the following code. // MARK: - New Instance extension KingDetailViewController { class func newInstance() -> ...
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0answers
79 views

Inject ViewModels created after getting Models from DB

I am currently working on a Picture Management software where I have to follow pretty strict requirements due to specified interfaces I am not allowed to change. Therefore I am forced to have a List&...
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0answers
136 views

Should I populate view model inside or before creating it

I'm not sure if softwareengineering exchange is right for the question. I need to populate view model with some values I query from the database. I do it like: var db = new NPoco.Database(...
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0answers
352 views

Recommended Archictecture in Android for communication between main View and RecyclerViewAdapter with MVVM

I'm trying to architect a screen with a fragment containing a date picker and some basic inputs and a list of items which more inputs. I'll try to exemplify with images: and a screen like this: ...
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247 views

MVVM Portable ViewModel / WPF/Xamarin Messaging

I have a WPF app targeting .NET 4 which I am updating and maintaining for a customer. In the course of the project, we have also ported the functionality to a Xamarin mobile app. I was able to ...
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0answers
59 views

How to share this kind of logic between view-models

Two view-models, each for a separate screen, have an ICommand which has same logic: it needs to choose between asking the user to choose from a list of items or choose an item automatically. How ...
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0answers
54 views

MVVM/Xamarin implementing services that require other services

Currently, I have a xamarin app that has a database, web service and 2 other services to handle the logic between the database/web service and the ui. I'm trying to make it all async, and therefore I ...
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0answers
181 views

Is there any way to take advantage of portable ViewModels for ASP.Net?

Microsoft supports portability when taking advantage of the MVVM pattern: https://msdn.microsoft.com/en-us/library/hh563947(v=vs.110).aspx This means that I can create a ViewModel that is reusable in ...
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0answers
931 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 ...