Questions tagged [wpf]

WPF is a graphical subsystem for rendering user interfaces in Windows-based applications.

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15 views

Multiple simultaneous users with oauth

I'm dealing with a native .net WPF app which is more or less a shopping client operated on one of multiple self service terminals. On these terminals the users have four possibilities in order to ...
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5answers
148 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 ...
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1answer
43 views

CRUD actions rexponsibility in the MVVM

In Form-based application (WPF/MVVM/SQLServer), consider the form that handles the classical actions that you can perform on any entity. Create Read Update Delete The problem, in general terms, is ...
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1answer
58 views

Structuring code to support console output and WPF views

Premise: This is for learning purpose. I'm trying to adapt my Console Application code to be served through a WPF Application GUI that I would like to create. One problem is struggling me. Actually ...
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3answers
229 views

Better way than singleton pattern to ensure single instance of class

When this question has been asked before on StackOverflow in 2011 and 2015, all answers as of now suggest to use a Singleton. But that’s not right. Singletons are defined by the Gang of Four to ...
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1answer
67 views

Best practice for populating a property of an entity object which requires a second database call

I'm running a commercial accounting software packages which uses a SQL server database. I've also developed a WPF application which is basically a slimmed down version of the commercial software. ...
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1answer
42 views

Subscribing to events in factory — better place?

I'm implementing an event-driven game in WPF and have the following Blackjack class: public class Blackjack { public Dealer Dealer { get; } = new Dealer(); public Player Player { get; } = new ...
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1answer
74 views

Provide overall application status in global exception handler/crash report

In my UI application (WPF/C#, using MVVM design pattern), I have implemented a global exception handler which catches all unexpected (hence uncaught) exceptions and reports the application crash to ...
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1answer
295 views

Throttling notifications from child ViewModel to parent ViewModel

I have a child view-model which notifies on a property change: public class ChildViewModel : INotifyPropertyChanged { private bool isSelected; public bool IsSelected { get => ...
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How to implment MVVM patern for editing a shared class instance?

I'm struggling with architecture for a few related programs and libraries. Primarily with how to handle editing properties of a model class instance across multiple views and where to implement ...
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2answers
511 views

Is it okay to pass my model into my view model via its constructor through MVVM practices?

public class LDLTrackViewModel : RailwayViewModel { private LDLTrack _ldlTrack; public LDLTrack LDLTrack { get => _ldlTrack; set { _ldlTrack = value; ...
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4answers
489 views

Why does C# not have automatic dispatchers

Why does C# make you put in a dispatcher for a different thread to update the UI? Example: Dispatcher.Invoke(() = { lblerrorName.Content = ""; }); It always gives the 'running on different ...
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How to make view models more DRY? [closed]

When looking at the WPF view model code samples on the web/books almost all of them show same approach for the bind-able properties that are used for the binding and input in the UI and that often ...
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1answer
123 views

Where do I save a Canvas “center position” coordinate in an MVVM architecture?

Assume I have a canvas that has rendered shapes. I can drag-move around that canvas as if I was in a zoomed in image to move all shapes around. Between the Model and ViewModel I have a ServiceLayer (...
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3answers
452 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 { ...
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1answer
148 views

Designing a WPF / MVVM architecture where view behavior changes in different states

As part of my bachelors thesis, I'm trying to develop something akin to a painting program. That means, I have a toolset, be it selection, drawing, highlighting, etc. I'll have a canvas that displays ...
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451 views

.NET WPF Best way to store a connection credential

I have an application that connects to SQL Server using windows credentials, which works very well for the domain paradigm. The client is now transitioning away from having a domain server, and is ...
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1answer
33 views

Separate or not separate(Window and datagrid)?

I am new to WPF but actually I need to code in it. I have got a **UserControl(Window)** and there is a DataGrid in it. DataGrid can be used somewhere else in the future, but not 100% sure. Me and one ...
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3answers
249 views

Keeping objects in RAM vs more queries to the database

So this is my DataStructure: Project - Name - ID - Image - History - User - Comment When my application first starts it is pulling all projects with all details. obviously ...
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1answer
133 views

Unit testing for a method in a class which uses constructor DI (prism)

I have a class that uses constructor DI for IEventAggregator public SomeViewModel(IEventAggregator eventAggregator) { this.eventAggregator = eventAggregator; ...
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1answer
2k 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 (...
3
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1answer
105 views

How to propagate Setting Class throughout entire project [closed]

Here's my setup: Entity Framework Backend Large WPF project that has a main window with 3-4 user controls on it, each of which has 3-4 user controls on it (and so on, in some cases) What I currently ...
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1answer
1k views

When to use The Messenger (Mediator) Pattern in MVVM design

I got confused with the role of the Messenger in MVVM. I see contradictory articles about it. This Article by MSDN by: Communicating from the View-Model to the View Observant readers will ...
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1answer
492 views

Where is it better to implement Copy/Cut/Paste in MVVM?

I am working on a project using C#/WPF and following MVVM pattern. This project is designed for touch screens. The major objects of the program are the following: We have Programs which contain ...
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1answer
567 views

Giving Viewmodels access to application wide Model in MVVM

I am practicing building applications using MVVM and WPF+C# by making a "finance application". The application contains several views with their own ViewModels. The views are in a hierarchy and are ...
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1answer
1k views

Wpf Application Structure? C#

I'm trying to port an application of mine from Java to C# and I can't for the life of me wrap my head around Wpf application structure. In Java my application runs the main() method which registers ...
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1answer
195 views

How to optimize a complex task with multiple DB calls

I have been working on a multi-layer, sale management application developed with WPF and partly refactored with EF6 (long story). The application has some very complex tasks which require multiple ...
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2answers
667 views

How to unit test this converter?

I am beginning with unit testing in c#. Here is my converter: public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { int c = 0; if (value != null) {...
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1answer
597 views

Dynamically injecting views with PRISM and WPF

I am writing application that will visualize some data. I will create custom user controls ( graphs,charts,tables ) for visualization. Now,to simplify it let's say, I want to have architecture like ...
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3answers
6k views

Moving from Qt/C++ to C#/WPF - Productivity Gain?

I created a small Desktop application (approx 15000 lines of code, so not that large) written in C++/Qt. This is non-commerical, just a hobby project and I am coding on my free time. The larger the ...
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0answers
129 views

Should I build a custom text editor from scratch or enhance existing ones?

I'm developing a Windows WPF app that needs to edit a certain type of document and I need a highly customized editor to do so: The text is a transcription of an audio feed, and I need to sync the the ...
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3answers
7k views

Is it good practice to use user controls to structure WPF forms even if these user controls are only used once?

I develop a WPF application using MVVM and I am learning how to do things best. I have a WPF form with selectors, two list with search fields, and some other elements. Currently all is in one form ...
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406 views

WPF DI with DbContext per form

Trying to figure out how to keep class methods clean, follow EF's guidance of short-lived DbContexts, and use DI in WPF. Issue I'm having is implementing transactions with DI. I'm trying to figure ...
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292 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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2answers
161 views

It's safe to access to the database and querying from it directly if it's on the server side, if not what should i do? [closed]

I made WPF application for a client-side and hosting database in a server side , I know there is something called REST API to transfer data between a client and server I don't know this method and ...
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1answer
106 views

Architecture for distributed real time traffic capturing/viewer system

I have a scenario as following (you can think of it as a distributed Wireshark system): For a single capturing session, there are about 1 ~ 10 traffic capturing nodes distributed in a LAN network. ...
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2answers
759 views

MVVM. Is it a code smell when view model has properties with names show/hide/display that semantically belong to view?

I've lately been involved with WPF and looked into MVVM. I understand that view model shouldn't be aware of view. However, sometimes I come across situation where my initial instinct is to write ...
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1answer
2k views

WPF, Dialog Service as injectable Service or a Static class

The background In MVVM, we tend "not" want to couple windows to view models for various reasons. Though from the very second screen on your application you start hitting this conceptual grey zone. ...
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2answers
477 views

Dealing with stale data persistence

Currently implemented the model and working on the UI for a scheduling application. This is just an in-house application for work between ~5 people that may occasionally have the application running ...
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2answers
2k views

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
2k views

Check is finish async and await behavior

I am trying to understand the async and await.Now i want to apply async and await keyword in my current project.My process structure are: //DataAccess Private List<Users> GetAllUsers() { ......
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1answer
82 views

Database checking for updates

Using SQLite in a WPF application that schedules events for people. The application will be used by 2-4 users concurrently. I'm wondering how to ensure each user has the most current database ...
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3answers
4k views

Is implementing INotifyPropertyChanged on a custom control a bad practice?

Imagine a Control is being created. It has some DependencyProperties and there are some properties which depend on the DependencyProperties, but doesn't need to be seen or updated from the outside. ...
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2answers
4k views

Overall view validation with a datagrid and keeping to MVVM

I am struggling to find a good architecture for what must be a common problem Enable/Disable a button in a View that contains a datagrid, and has validation requirements on the cell, row and ...
3
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1answer
7k views

WPF MVVM Loading data on startup

I am building a simple master-details GUI using WPF/MVVM/Prism for some data coming from a Restful service. I have the main window as my main view with a corresponding view model. I have a user ...
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2answers
4k views

How to implement validation before setting a property value in MVVM (WPF)

Scenario. ViewModel has a property State. View has a ComboBox that allows to change value of State. ViewModel needs to run some validation (call bool ValidateState(State value) method) before setting ...
3
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3answers
8k views

MVVM Correct way to switch between views occupying the same footprint on the screen

An example is switching the main view according to the selected item in a hamburger menu. Also sometimes it is just a small part of the GUI that changes according to the application state or according ...
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1answer
227 views

how should the MVP pattern handle views created at runtime?

how should the MVP pattern handle views created at runtime ? for example There is a mainView (that has a model and presenter) that needs to display a list, each item in the list is represented by it'...
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3answers
19k views

Is it OK to create an Entity Framework DataContext object and dispose it in a using block in each of my CRUD methods?

I'm building a wpf application which implements the following features: Take user input and read data from databases perform some calculations on it Showcase it to the user in multiple types of views ...
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1answer
1k views

Duplicating Domain Model in View Model or not

I have an XML file that contains configuration information for a system. I can serialize/deserialize the XML into a hierarchy of objects that describe the configuration (and no more) and then pass ...

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