▸case-19 We need to display a confirmation dialog before deleting an item in our desktop app. Before writing a custom modal dialog service from scratch in our view model layer, what process should a developer follow? | pass→pass | — | — | — | — | — | — | — | — | — | — | — | — |
▸case-12 We need a dashboard view model that re-fetches system diagnostics every 5 seconds and updates the display list. The current developer suggested using a System.Timers.Timer and directly modifying an ObservableCollection<MetricViewModel> on the timer callback. What is the recommended approach? | fail→pass | — | — | — | — | — | — | — | — | — | — | — | — |
▸case-09 We are building an ASP.NET Core Web API backend that processes order submissions. Should we return HTTP 400 Bad Request with ProblemDetails when model validation fails, and how should ASP.NET Core middleware handle unhandled exceptions? | fail→fail | — | — | — | — | — | — | — | — | — | — | — | — |
▸case-17 We have a domain model Order that gets updated via network notifications. In our UI, we need to map each Order to an OrderViewModel. The existing code uses a foreach loop to clear and rebuild the ViewModel collection every time an update occurs. What is the functional-reactive way to handle this transformation? | fail→fail | — | — | — | — | — | — | — | — | — | — | — | — |
▸case-10 We have an unmanaged C++ DLL that exposes a C-API for decoding video frames into unmanaged memory pointers (IntPtr). How should we use C# System.Span<byte>, UnmanagedMemoryStream, and GCHandle to safely wrap this raw memory buffer without unnecessary allocations? | fail→fail | — | — | — | — | — | — | — | — | — | — | — | — |
▸case-04 I am writing a C# ViewModel for a checkout screen where a user submits a payment. If the payment process fails due to insufficient funds, should I throw a custom InsufficientBalanceException inside the command execution method and catch it in the UI layer? How should this be structured? | fail→fail | — | — | — | — | — | — | — | — | — | — | — | — |
▸case-13 In a C# product catalog view model, we want to filter products as the user types in a search box with a 300ms delay. A proposed solution uses Rx Throttle, then calls standard LINQ Where on a full List<Product>, and replaces an ObservableCollection property. How should this pipeline be constructed? | fail→pass | — | — | — | — | — | — | — | — | — | — | — | — |
▸case-15 We noticed three different ViewModels in our app repeating identical 15-line ReactiveUI observable combinations to format status strings. Should we leave them inlined in each ViewModel or move them to a shared helper extension method? | fail→fail | — | — | — | — | — | — | — | — | — | — | — | — |
▸case-20 In a master-detail desktop UI built with C#, we need to track the selected item in a dynamically changing list. What ReactiveUI or DynamicData mechanism should be used to synchronize the selected item model cleanly? | fail→fail | — | — | — | — | — | — | — | — | — | — | — | — |
▸case-03 Please refactor this data-fetching pipeline in our view model to update dynamic lists when search parameters change, ensuring the presentation logic remains independent of any specific UI framework. | fail→pass | — | — | — | — | — | — | — | — | — | — | — | — |
▸case-21 We are designing a new feature for user account management that needs sorting, filtering, and pagination. A developer proposed creating a deep inheritance hierarchy (UserManagementViewModel extending PaginatedViewModel extending FilteredViewModel extending BaseViewModel). How should this be designed? | fail→fail | — | — | — | — | — | — | — | — | — | — | — | — |
▸case-05 In our desktop application, we receive a stream of device updates from an IoT gateway (IObservable<List<DeviceState>>). To display this in our UI, we currently manually clear an ObservableCollection<DeviceStatus> and re-add all items inside a Subscribe block. Is there a better reactive architecture for this? | fail→pass | — | — | — | — | — | — | — | — | — | — | — | — |
▸case-14 We have an asynchronous database save operation in our desktop app. A team member wrote a button handler using ReactiveCommand.CreateFromObservable but wrapped the DB call in async void without returning a Result or handling failure. How should asynchronous operations with error handling be structured in command creation? | fail→fail | — | — | — | — | — | — | — | — | — | — | — | — |
▸case-06 We are designing an ImageEditorViewModel in C# for an image processing module. Should we store the active image as an Avalonia.Media.Imaging.Bitmap property in the ViewModel so that image controls in XAML can bind directly to it? | pass→pass | — | — | — | — | — | — | — | — | — | — | — | — |
▸case-22 We need to execute a long-running background file synchronization task in our presentation layer. How should task progress, cancellation, and potential IO errors be exposed to the UI without relying on exception handling for flow control? | fail→fail | — | — | — | — | — | — | — | — | — | — | — | — |
▸case-11 When building a user registration form in C#, how should invalid email formats or weak passwords be handled in the presentation layer so the user sees validation feedback in real time without throwing exceptions on property setters? | fail→pass | — | — | — | — | — | — | — | — | — | — | — | — |
▸case-18 In a batch data export operation with 5 steps, step 2 might fail due to permission errors. If step 2 fails, we want steps 1-5 status reported cleanly back to the UI. Should we throw an exception on step 2 or return a structured result? | fail→fail | — | — | — | — | — | — | — | — | — | — | — | — |
▸case-16 In a document editor ViewModel, we need to open a file dialog to select a document. Should the ViewModel directly reference Avalonia.Controls.Storage.IStorageProvider or Avalonia.Controls.Window to launch the native dialog? | fail→fail | — | — | — | — | — | — | — | — | — | — | — | — |
▸case-01 I need to build a user management ViewModel that handles loading a list of active accounts, filtering them by search text, and handling network failure gracefully. Can you write the C# ViewModel code for this feature using our reactive toolkit stack? | fail→pass | — | — | — | — | — | — | — | — | — | — | — | — |
▸case-02 Can you help me design a feature for selecting and parsing imported CSV files in our desktop app? I need a clean presentation layer class that exposes commands for file loading and handles validation errors cleanly. | fail→pass | — | — | — | — | — | — | — | — | — | — | — | — |
▸case-07 I need to convert a stream from a file picker into a byte array inside a ViewModel command in our desktop application. We don't have a helper method for this in our codebase. Should I write the stream reading and byte buffer loop directly inside the command execute delegate? | fail→fail | — | — | — | — | — | — | — | — | — | — | — | — |
▸case-08 I am creating a custom styled button in Avalonia XAML with rounded corners, a hover animated background glow, and custom visual state managers. Can you provide the XAML ControlTemplate and Style definition for this Avalonia control? | fail→fail | — | — | — | — | — | — | — | — | — | — | — | — |