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aqsztdje3vj55239

•Created by aqsztdje3vj55239 on 3/10/2025 in #help

Problem with Dependency Injection (DI) / IoC for Dynamically Creating Controls and ViewModels

Problem with Dependency Injection (DI) / IoC for Dynamically Creating Controls and ViewModels I'm working on a WPF application using Autofac for Dependency Injection. The application needs to dynamically create UI controls and their corresponding ViewModels at runtime based on a JSON configuration. The Problem - The ViewModel and Control types are not known at compile-time. - ViewModels may have dependencies that need to be resolved via DI. - Some custom parameters need to be injected dynamically. - The solution should follow IoC and DI principles while avoiding the Service Locator anti-pattern. Example JSON Configuration

{
  "Control": "CustomImageControl",
  "ViewModel": "CustomImageControlViewModel",
  "Dependencies": {
    "Filter": "CustomImageFilter"
  },
  "Parameters": {
    "Whatever": "you like"
  }
}

{
  "Control": "CustomImageControl",
  "ViewModel": "CustomImageControlViewModel",
  "Dependencies": {
    "Filter": "CustomImageFilter"
  },
  "Parameters": {
    "Whatever": "you like"
  }
}

--- The Solution To solve this, I used a factory pattern combined with Autofac's IComponentContext: 1. A ViewModelFactory that resolves ViewModels dynamically
- Uses IComponentContext to inject dependencies while allowing dynamic parameter setting. 2. A ControlFactory that resolves UI controls
- Assigns the dynamically resolved ViewModel to the control. 3. Factories are injected via DI, avoiding direct use of IComponentContext in other parts of the application. ViewModel Factory Example

See attachments

This allows for dynamic ViewModel creation with DI-managed dependencies and additional runtime parameters while keeping the system modular, testable, and IoC-compliant. --- Question Is this the best way to handle dynamic UI creation with DI, or is there a more efficient approach while still following IoC principles?

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•Created by aqsztdje3vj55239 on 7/31/2024 in #help

How to test user controls

Good day everyone, I've recently started working on a decently big project at work which uses a lot of user controls. Currently, if anyone wants to test the controls, they usually add it to one of our default applications, which is quite the pain since it takes up to 2 minutes to start, has a annoying log in screen and is pretty slow on our development laptops. Coming from my own UI implementations in C++/OpenGL or IMGUI, I've always had a way to launch a window with only a single ui component for testing, saving a screenshot of every distinct frame, manual testing with pass/fail buttons. But I couldn't find anything in regards to testing user controls in isolation in c#/wpf. I had the idea to do it similar to my manual pass/fail approach and just create a window and set the content to the user control, but I was wondering if there are any better ways or if I am simply bad at searching... tldr: how do I test user controls in isolation

2 replies

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