---
source_files:
  - DataPRO/Modules/Reports/PedestrianAndHeadReports/Resources/TranslateExtension.cs
  - DataPRO/Modules/Reports/PedestrianAndHeadReports/Resources/StringResources.Designer.cs
generated_at: "2026-04-16T04:55:02.133936+00:00"
model: "Qwen/Qwen3-Coder-Next-FP8"
schema_version: 1
sha256: "b181762eeb96b72d"
---

# Resources

## Documentation: `TranslateExtension` Module

---

### 1. Purpose

This module provides a WPF `MarkupExtension` (`TranslateExtension`) to enable declarative, localized string resolution in XAML. It allows UI elements (e.g., `TextBlock.Text`, `Header`, etc.) to bind to resource keys and automatically retrieve the corresponding localized string at runtime from `StringResources`, falling back to a standardized placeholder if the key is missing or empty. Its role is to centralize and simplify internationalization (i18n) for the *PedestrianAndHeadReports* module, ensuring consistent handling of localized UI text without requiring code-behind or manual resource lookups.

---

### 2. Public Interface

#### `TranslateExtension` class  
**Namespace:** `PedestrianAndHeadReports.Resources`  
**Inherits:** `System.Windows.Markup.MarkupExtension`

##### Constructor  
```csharp
public TranslateExtension(string key)
```
- **Purpose:** Initializes a new instance with the specified resource key.
- **Parameters:**  
  - `key`: The string key used to look up a localized value in `StringResources.ResourceManager`.

##### `ProvideValue` method  
```csharp
public override object ProvideValue(IServiceProvider serviceProvider)
```
- **Purpose:** Returns the localized string corresponding to `_key`, or a fallback value if lookup fails.
- **Behavior:**  
  - If `_key` is `null` or empty → returns `"#stringnotfound#"`.  
  - Otherwise, calls `StringResources.ResourceManager.GetString(_key)`.  
    - If the result is non-null → returns the localized string.  
    - If the result is `null` → returns `"#stringnotfound# " + _key` (i.e., the placeholder followed by a space and the original key).  
- **Return type:** `object` (always a `string` per `[MarkupExtensionReturnType(typeof(string))]`).

---

### 3. Invariants

- **Key must be non-null/non-empty for meaningful lookup:**  
  Empty or `null` keys are explicitly handled and return `"#stringnotfound#"`—no exception is thrown.
- **Fallback format is deterministic:**  
  When a key is missing, the output is always `"#stringnotfound# <key>"`. This makes missing keys visually identifiable in the UI.
- **Thread-safety of resource access is assumed:**  
  `StringResources.ResourceManager.GetString(...)` is used directly; while `ResourceManager` is thread-safe for concurrent reads, the extension itself does not enforce synchronization (but WPF’s `MarkupExtension` lifecycle typically avoids concurrent `ProvideValue` calls per instance).
- **Return type is always a string:**  
  Guaranteed by `[MarkupExtensionReturnType(typeof(string))]` and implementation.

---

### 4. Dependencies

#### Dependencies *of* this module:
- **`System.Windows.Markup`** (WPF framework): Required for `MarkupExtension` base class and `MarkupExtensionReturnTypeAttribute`.
- **`PedestrianAndHeadReports.Resources.StringResources`**:  
  - Used via `StringResources.ResourceManager.GetString(...)`.  
  - `StringResources` is auto-generated from `.resx` files and contains strongly-typed properties (e.g., `Acceleration`, `TestDate`) backed by the `ResourceManager`.

#### Dependencies *on* this module:
- **XAML files in the `PedestrianAndHeadReports` module** (inferred):  
  - Likely used in XAML as `{local:Translate KeyName}` to localize UI elements.  
  - Example: `<TextBlock Text="{local:Translate Acceleration}" />` → resolves to localized string for `"Acceleration"` (e.g., `"加速度"` in Japanese).

#### External dependencies:
- **.NET Framework 4.0+** (inferred from runtime version in `StringResources.Designer.cs` header).

---

### 5. Gotchas

- **No caching of resolved values per instance:**  
  Each call to `ProvideValue` performs a fresh `ResourceManager.GetString(_key)` lookup. While `ResourceManager` caches internally, repeated use of the same `TranslateExtension` instance in different contexts (e.g., data templates) may re-resolve unnecessarily.
- **Missing keys produce visible placeholders in UI:**  
  The `"#stringnotfound# <key>"` fallback is intentional for debugging but may appear in production if resource keys are mistyped or missing in `.resx` files.
- **Case sensitivity of keys:**  
  Resource keys (e.g., `"Acceleration"`, `"Acceleration "`) are case-sensitive. A mismatch in casing (e.g., `"acceleration"`) will result in a `null` lookup and fallback.
- **No support for parameterized strings (e.g., `string.Format`):**  
  The extension only supports simple key → string lookup. It does not handle placeholders (e.g., `"Hello {0}"`) or arguments.
- **Auto-generated `StringResources` class:**  
  Changes to the underlying `.resx` file require regeneration of `StringResources.Designer.cs`. If keys are renamed/removed in `.resx` but referenced in XAML via `TranslateExtension`, they will fall back to `"#stringnotfound#..."`.
- **No culture override support in `TranslateExtension`:**  
  While `StringResources.Culture` can be set globally, `TranslateExtension` does not expose or accept a culture parameter—respects only the current UI thread’s `CurrentUICulture`.

> **None identified from source alone.**  
> *(Note: The above are inferred from standard behavior of `ResourceManager`, WPF `MarkupExtension`, and common localization patterns—not from explicit warnings in the source.)*