---
source_files:
  - DTS Viewer/DTS.Viewer.Modules/DTS.Viewer.TestSummaryList/ViewModel/TestSummaryViewModel.cs
  - DTS Viewer/DTS.Viewer.Modules/DTS.Viewer.TestSummaryList/ViewModel/TestSummaryViewListModel.cs
generated_at: "2026-04-16T13:54:46.702068+00:00"
model: "zai-org/GLM-5-FP8"
schema_version: 1
sha256: "b27cef2360f72751"
---

# Documentation: TestSummaryList ViewModels

## 1. Purpose

This module provides two ViewModel implementations (`TestSummaryViewModel` and `TestSummaryViewListModel`) for managing and displaying test summary data within the DTS Viewer application. Both classes implement `ITestSummaryListViewModel` and serve as intermediaries between test summary data models and their associated views, handling user interactions, event-based communication via Prism's EventAggregator, and data binding for test summary lists. The module supports filtering, sorting, selection tracking, and notification of changes to other application components.

---

## 2. Public Interface

### TestSummaryViewModel

**Constructor:**
```csharp
public TestSummaryViewModel(ITestSummaryListView view, IRegionManager regionManager, IEventAggregator eventAggregator, IUnityContainer unityContainer)
```
Initializes the ViewModel, sets the View's DataContext, creates interaction requests, and subscribes to `RaiseNotification` and `DataFolderChangedEvent` events.

**Methods:**

| Method | Signature | Description |
|--------|-----------|-------------|
| `Initialize` | `void Initialize()` | Empty override. |
| `Initialize` | `void Initialize(object parameter)` | Casts `parameter` to `IBaseWindowModel` and assigns to `Parent`. |
| `Activated` | `void Activated()` | Throws `NotImplementedException`. |
| `Cleanup` | `void Cleanup()` | Throws `NotImplementedException`. |
| `CleanupAsync` | `Task CleanupAsync()` | Throws `NotImplementedException`. |
| `InitializeAsync` | `Task InitializeAsync()` | Throws `NotImplementedException`. |
| `InitializeAsync` | `Task InitializeAsync(object parameter)` | Throws `NotImplementedException`. |
| `PublishSelectedTestSummaryList` | `void PublishSelectedTestSummaryList()` | Publishes `TestSummaryChangeNotification` and `TestSelectedChangedEvent` events with current selection. |

**Properties:**

| Property | Type | Description |
|----------|------|-------------|
| `TestSummaryListView` | `ITestSummaryListView` | The associated view instance. |
| `NotificationRequest` | `InteractionRequest<Notification>` | Prism interaction request for notifications. |
| `ConfirmationRequest` | `InteractionRequest<Confirmation>` | Prism interaction request for confirmations. |
| `ContextNavigationRegion` | `object` | Gets/sets content of `TestListRegion` on the view. |
| `SelectedTestSummary` | `TestSummary` | Currently selected test summary. |
| `SelectedTestSummaryList` | `List<ITestSummary>` | List of selected test summaries. |
| `TestSummaryList` | `ObservableCollection<ITestSummary>` | Collection of all test summaries. |
| `HeaderInfo` | `string` | Returns `"TestSummaryRegion"`. |
| `IsBusy` | `bool` | Busy indicator state. |
| `IsDirty` | `bool` | Dirty state flag. |
| `IsNavigationIncluded` | `bool` | Navigation inclusion flag. |

---

### TestSummaryViewListModel

**Constructor:**
```csharp
public TestSummaryViewListModel(ITestSummaryListView view, IRegionManager regionManager, IEventAggregator eventAggregator, IUnityContainer unityContainer)
```
Initializes the ViewModel, sets the View's DataContext, creates interaction requests, and stores dependencies.

**Methods:**

| Method | Signature | Description |
|--------|-----------|-------------|
| `Initialize` | `void Initialize()` | Empty override. |
| `Initialize` | `void Initialize(object parameter)` | Sets `Parent`, initializes `FilterView`, attaches collection changed handlers, calls `Subscribe()`. |
| `Activated` | `void Activated()` | Publishes `FilterParameterChangedEvent` with empty parameter. |
| `Cleanup` | `void Cleanup()` | Clears all test summary collections, resets `SelectedTestSummary`, calls `PublishSelectedTestSummaryList()`. |
| `PublishSelectedTestSummaryList` | `void PublishSelectedTestSummaryList()` | Publishes `TestSummaryChangeNotification`, `TestSummaryCountNotification`, and `ResetZoomChangedEvent` events. |
| `OnFilterChanged` | `void OnFilterChanged(FilterParameterArgs args)` | Filters `FilteredTestSummaryList` based on `args.Param` matching `SetupName`, `Id`, or `Description`. |
| `RefreshDataFolder` | `void RefreshDataFolder()` | Publishes `DataFolderChangedEvent` via dispatcher. |
| `SelectDataFolder` | `void SelectDataFolder()` | Opens file dialog for `.dts` files, publishes `DataFileSelectedEvent` on selection. |

**Properties:**

| Property | Type | Description |
|----------|------|-------------|
| `FilterView` | `IFilterView` | Filter view instance. |
| `View` | `ITestSummaryListView` | The associated view instance. |
| `NotificationRequest` | `InteractionRequest<Notification>` | Prism interaction request for notifications. |
| `ConfirmationRequest` | `InteractionRequest<Confirmation>` | Prism interaction request for confirmations. |
| `ContextNavigationRegion` | `object` | Gets/sets DataContext of `TestListRegion` on the view. |
| `IsFilterEnabled` | `bool` | Indicates if filtering is available (true when `TestSummaryList` has items). |
| `SelectedTestSummary` | `TestSummary` | Currently selected test summary. |
| `SelectedTestSummaryList` | `List<ITestSummary>` | List of selected test summaries. |
| `TestSummaryList` | `ObservableCollection<ITestSummary>` | Full collection of test summaries. |
| `FilteredTestSummaryList` | `ObservableCollection<ITestSummary>` | Filtered/sorted view of test summaries. |
| `HeaderInfo` | `string` | Returns `"TestSummaryRegion"`. |
| `IsBusy` | `bool` | Busy indicator state. |
| `IsDirty` | `bool` | Dirty state flag. |
| `IsNavigationIncluded` | `bool` | Navigation inclusion flag. |
| `SelectedDataFolder` | `string` | Selected data folder path; setter publishes `DataFolderChangedEvent`. |
| `SelectedDataFile` | `string` | Selected data file path; setter publishes `DataFolderChangedEvent`. |
| `SortableAttributes` | `List<string>` | List of localized sortable attribute names. |
| `SelectedSortIndex` | `int` | Index of selected sort option; setter triggers `SortTestSummaryList()`. |

**Commands:**

| Command | Type | Description |
|---------|------|-------------|
| `RefreshDataFolderCommand` | `DelegateCommand` | Executes `RefreshDataFolder()`. |
| `SelectDataFolderCommand` | `DelegateCommand` | Executes `SelectDataFolder()`. |

**Nested Types:**

| Type | Description |
|------|-------------|
| `SortableAttribute` (enum) | Sort options: `TimeStampDescending`, `Timestamp`, `FileDateDescending`, `FileDate`, `IdDescending`, `Id`, `TestSetupDescending`, `TestSetup`. |
| `SortableAttributeHelper` | Helper class for localizing sort attribute display names via `StringResources`. |

---

## 3. Invariants

- **Parent Assignment:** `Initialize(object parameter)` in both classes expects `parameter` to be castable to `IBaseWindowModel` (TestSummaryViewModel) or `IBaseViewModel` (TestSummaryViewListModel); a null or incorrect type will cause an invalid cast exception.
- **Event Subscription Timing:** Event subscriptions occur in the constructor (TestSummaryViewModel) or in `Initialize` via `Subscribe()` (TestSummaryViewListModel); events published before initialization may not be received.
- **Collection Synchronization:** In `TestSummaryViewListModel`, `FilteredTestSummaryList` is automatically synchronized with `TestSummaryList` via `TestSummaryList_CollectionChanged` handler.
- **Filter Ownership:** `OnFilterChanged` only applies filtering when `FilterView.DataContext.Parent` equals `this`.
- **Data Folder Event Handling:** `OnDataFolderChanged` in `TestSummaryViewListModel` only processes events where `arg.ParentVM` matches `Parent`.
- **Property Setters with Side Effects:** `SelectedDataFolder` and `SelectedDataFile` setters publish events; setting to null or empty string returns early without publishing.
- **Sort Index Default:** `SelectedSortIndex` defaults to `(int)SortableAttribute.TimeStampDescending` (value 0).

---

## 4. Dependencies

### External Dependencies (from imports):

| Namespace | Purpose |
|-----------|---------|
| `DTS.Common.Base` | `BaseViewModel<T>` base class. |
| `DTS.Common.Classes.TestMetadata` / `DTS.Common.Classes.Viewer.TestMetadata` | `TestSummary`, `ITestSummary` interfaces. |
| `DTS.Common.Events` | Event types: `RaiseNotification`, `DataFolderChangedEvent`, `ShowStatus`, `TestSummaryChangeNotification`, `TestSelectedChangedEvent`, `FilterParameterChangedEvent`, `RefreshTestRequestEvent`, `BusyIndicatorChangeNotification`, `TestSummaryCountNotification`, `ResetZoomChangedEvent`, `DataFileSelectedEvent`. |
| `DTS.Common.Interface` | `IBaseWindowModel`, `IBaseViewModel`, `IEventAggregator` usage patterns. |
| `DTS.Common.Interface.TestDefinition` | `ITestSummaryListViewModel`, `ITestSummaryListView`. |
| `DTS.Common.Interactivity` | `NotificationContentEventArgs`. |
| `DTS.Viewer.TestSummaryList.Model` | `TestSummaryModel` for data loading. |
| `DTS.Viewer.TestSummaryList.Resources` | `StringResources` for localization. |
| `Microsoft.Practices.Prism.Events` / `Prism.Events` | `EventAggregator` pattern. |
| `Microsoft.Practices.Prism.Interactivity.InteractionRequest` / `Prism.Interactivity` | `InteractionRequest<T>`, `Notification`, `Confirmation`. |
| `Microsoft.Practices.Prism.Regions` / `Prism.Regions` | `IRegionManager`, region-based navigation. |
| `Microsoft.Practices.Unity` / `Unity` | `IUnityContainer` for dependency injection. |
| `Prism.Commands` | `DelegateCommand`. |
| `System.Windows.Forms` | `OpenFileDialog` for file selection. |

### Internal Dependencies:

- **TestSummaryModel:** Both ViewModels instantiate `TestSummaryModel` to call `GetTestSummary()` for loading data.
- **IFilterView / IFilterViewModel:** `TestSummaryViewListModel` resolves these via Unity container.

### Consumers (inferred):

- Views: `TestSummaryView` (referenced in `TestSummaryViewModel.ContextNavigationRegion`), `TestSummaryListView` (referenced in `TestSummaryViewListModel.ContextNavigationRegion`).
- Any module subscribing to `TestSummaryChangeNotification`, `TestSummaryCountNotification`, `TestSelectedChangedEvent`, or `ResetZoomChangedEvent`.

---

## 5. Gotchas

### Critical Issues:

1. **NotImplementedException Methods in TestSummaryViewModel:** The following methods throw `NotImplementedException`: `Activated()`, `Cleanup()`, `CleanupAsync()`, `InitializeAsync()`, and `InitializeAsync(object parameter)`. Calling these will crash the application.

2. **Misleading XML Documentation:** The constructor XML comment in `TestSummaryViewModel` states "Creates a new instance of the TechnologyDoFrontEditViewModel" — this appears to be a copy-paste error from another class.

3. **Event Signature Mismatch:** `TestSummaryViewModel.OnDataFolderChanged(string path)` expects a `string` parameter, while `TestSummaryViewListModel.OnDataFolderChanged(DataFolderSelectionArg arg)` expects `DataFolderSelectionArg`. The event `DataFolderChangedEvent` is subscribed by both with incompatible signatures — unclear which signature the event actually uses.

4. **new Keyword Shadowing:** Both classes use `new` keyword on `PropertyChanged`, `OnPropertyChanged`, `IsBusy`, `IsDirty`, and `IsNavigationIncluded`. This suggests the base class `BaseViewModel<T>` already defines these members, and the shadowing may cause unexpected behavior when casting to base type.

5. **Direct View Casting:** `ContextNavigationRegion` property directly casts the view interface to concrete types (`TestSummaryView` or `TestSummaryListView`), breaking the interface abstraction pattern.

6. **Dispatcher Usage in RefreshDataFolder:** `RefreshDataFolder()` uses `Dispatcher.CurrentDispatcher.Invoke()` with `DispatcherPriority.Background`, which may cause timing issues if called from a non-UI thread.

7. **Sort Implementation Rebuilds Collection:** `SortTestSummaryList()` clears and rebuilds `FilteredTestSummaryList` on every sort change, which may cause UI flicker and performance issues with large datasets.

8. **Missing Unsubscribe:** Neither class unsubscribes from events in cleanup, potentially causing memory leaks if instances are not properly garbage collected.