52 lines
4.0 KiB
Markdown
52 lines
4.0 KiB
Markdown
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---
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source_files:
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- DataPRO/Modules/Database/DatabaseServices/Resources/TranslateExtension.cs
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- DataPRO/Modules/Database/DatabaseServices/Resources/StringResources.Designer.cs
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generated_at: "2026-04-16T04:35:33.501804+00:00"
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model: "Qwen/Qwen3-Coder-Next-FP8"
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schema_version: 1
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sha256: "79b93425a9c97e71"
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---
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# Resources
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## Documentation: `TranslateExtension` Markup Extension
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### 1. Purpose
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The `TranslateExtension` class is a WPF `MarkupExtension` that enables declarative localization of UI text directly in XAML. It resolves string resources by key at runtime using the `StringResources` strongly-typed resource class, returning localized strings or a standardized fallback for missing keys. This module exists to support multi-language UIs in the DatabaseServices module by abstracting resource lookup into a XAML-friendly syntax (e.g., `{local:Translate KeyName}`), decoupling UI text from code and enabling runtime culture switching.
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### 2. Public Interface
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- **`TranslateExtension(string key)`**
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Constructor. Accepts a resource key (e.g., `"ClearingLocalDb"`) to look up. Throws no exceptions on invalid input—invalid keys are handled at lookup time.
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- **`override object ProvideValue(IServiceProvider serviceProvider)`**
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WPF framework method invoked during XAML parsing. Returns the localized string corresponding to `_key`, or a fallback value if the key is missing/empty.
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- If `_key` is `null` or empty: returns `"#stringnotfound#"`.
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- If `StringResources.ResourceManager.GetString(_key)` returns `null`: returns `"#stringnotfound# " + _key`.
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- Otherwise: returns the localized string.
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### 3. Invariants
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- `_key` is immutable after construction (stored in a `readonly` field).
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- The returned value is always a `string` (per `[MarkupExtensionReturnType(typeof(string))]`).
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- No exceptions are thrown during `ProvideValue`—all error cases return a fallback string.
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- Resource lookup uses the current UI culture (via `StringResources.Culture`), which may be set externally (e.g., by WPF’s `FrameworkElement.Language` or manual assignment).
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- The `StringResources` class is auto-generated and must be kept in sync with `.resx` files; changes to `.resx` require regeneration.
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### 4. Dependencies
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- **Depends on**:
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- `System.Windows.Markup` (for `MarkupExtension` and `MarkupExtensionReturnType`).
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- `DatabaseServices.Resources.StringResources` (strongly-typed resource class).
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- `System.Resources.ResourceManager` (via `StringResources.ResourceManager`).
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- **Used by**:
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- XAML files in the `DatabaseServices` module (e.g., `Window.xaml`, `UserControl.xaml`) to bind localized text to UI elements.
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- No direct programmatic callers in the provided source—usage is exclusively via XAML markup.
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### 5. Gotchas
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- **Hardcoded fallback prefix**: The `"#stringnotfound#"` string is hardcoded; changing it requires updating both `TranslateExtension` and any tests/scripts expecting this pattern.
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- **No caching of lookups**: `ResourceManager.GetString(_key)` is called on every `ProvideValue` invocation. While `ResourceManager` caches internally, repeated lookups for the same key in high-frequency UI scenarios (e.g., data-bound lists) may incur overhead.
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- **Silent failure on missing keys**: Missing keys produce visible text like `"#stringnotfound# ClearingLocalDb"` in the UI, which may confuse end users. No logging or telemetry is performed.
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- **No null-safety for `serviceProvider`**: The `serviceProvider` parameter is unused, but if future changes require it (e.g., for service resolution), this could break.
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- **Auto-generated resource class**: `StringResources.Designer.cs` is auto-generated—manual edits are unsafe and will be overwritten. Resource keys must match exactly (case-sensitive) with entries in the `.resx` file.
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- **No support for pluralization/formatting**: The extension only supports simple key→string lookups; composite strings (e.g., `"Connected to: {0}"`) require manual formatting in code-behind or XAML.
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None identified beyond these.
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