---
source_files:
  - DTS Viewer/DTS.Viewer.Modules/DTS.Viewer.ChartOptions/Resources/TranslateExtension.cs
  - DTS Viewer/DTS.Viewer.Modules/DTS.Viewer.ChartOptions/Resources/StringResources.Designer.cs
generated_at: "2026-04-16T13:56:16.461808+00:00"
model: "zai-org/GLM-5-FP8"
schema_version: 1
sha256: "8d340ea94a701586"
---

# Documentation: DTS.Viewer.ChartOptions Resources

## 1. Purpose
This module provides localization infrastructure for the `DTS.Viewer.ChartOptions` namespace. It consists of a strongly-typed resource accessor class (`StringResources`) generated from a `.resx` file, and a XAML markup extension (`TranslateExtension`) that allows UI elements to bind directly to localized strings. This separates user-facing string management from application logic, supporting multi-language scenarios.

## 2. Public Interface

### `TranslateExtension` (Class)
**Namespace:** `DTS.Viewer.ChartOptions`
**Inheritance:** `System.Windows.Markup.MarkupExtension`

This class enables XAML binding to localized resources.

*   **Constructor**
    *   `public TranslateExtension(string key)`: Initializes the extension with the resource key to look up.

*   **Methods**
    *   `public override object ProvideValue(IServiceProvider serviceProvider)`: Resolves the `_key` provided in the constructor to a localized string.
        *   Returns the localized string if found.
        *   Returns `#stringnotfound#` if the key is null or empty.
        *   Returns `#stringnotfound# [key]` if the lookup fails for a specific key.

### `StringResources` (Class)
**Namespace:** `DTS.Viewer.ChartOptions.Resources`
**Access Modifier:** `internal`

A strongly-typed resource class auto-generated by Visual Studio. It provides static properties to access culture-specific string values.

*   **Properties**
    *   `internal static global::System.Resources.ResourceManager ResourceManager`: Gets the cached `ResourceManager` instance for this assembly.
    *   `internal static global::System.Globalization.CultureInfo Culture`: Gets or sets the current UI culture used for resource lookups.

*   **Resource String Properties (Static, Read-Only)**
    The following properties return localized strings corresponding to specific UI elements:
    *   `ChartUnitType`
    *   `FilterOptions_Title`
    *   `LockT`
    *   `MaxT`
    *   `MaxY`
    *   `MinT`
    *   `MinY`
    *   `Range`
    *   `ResetAll`
    *   `ResetT`
    *   `SaveChart`
    *   `SaveToPDF`
    *   `TimeUnitType`

## 3. Invariants

1.  **Return Type Guarantee:** The `TranslateExtension` class is decorated with `[MarkupExtensionReturnType(typeof(string))]`, guaranteeing that `ProvideValue` returns a `string` (boxed as `object`).
2.  **Non-Null Return:** `TranslateExtension.ProvideValue` will never return `null`. It guarantees a return value even if the key is missing or invalid (returning a fallback error string).
3.  **Resource Manager Singleton:** `StringResources.ResourceManager` uses a lazy-initialization pattern; it creates the `ResourceManager` instance only once and caches it in the private static field `resourceMan`.
4.  **Immutability of Key:** Once `TranslateExtension` is constructed, the `_key` field is `readonly` and cannot be changed.

## 4. Dependencies

**Internal Dependencies:**
*   `TranslateExtension` depends entirely on `StringResources.ResourceManager` to perform the actual string lookup.

**External Dependencies:**
*   `System.Windows.Markup`: Required for `MarkupExtension` and `IServiceProvider` (implies this is a WPF module).
*   `System.Resources`: Required for `ResourceManager`.
*   `System.Globalization`: Required for `CultureInfo`.

**Downstream Dependencies:**
*   XAML files within the `DTS.Viewer.ChartOptions` module (or other modules referencing this namespace) depend on `TranslateExtension` to display localized text (e.g., usage likely looks like `{local:Translate KeyName}`).

## 5. Gotchas

1.  **Silent Failure Behavior:** `TranslateExtension` does not throw exceptions for missing keys. Instead, it returns the literal string `#stringnotfound#` (for null/empty keys) or `#stringnotfound# [key]` (for missing keys). This visual indicator might appear in the UI if resources are misconfigured, rather than causing a compile-time or runtime crash.
2.  **Auto-Generated Code:** `StringResources` is marked with `GeneratedCodeAttribute`. Manual edits to this file will be overwritten if the resource tooling regenerates it. The actual string values reside in an external `.resx` file (likely `StringResources.resx`) which is not visible in the provided source but is implied by the designer file.
3.  **Internal Visibility:** The `StringResources` class is `internal`. It cannot be accessed directly from outside the `DTS.Viewer.ChartOptions` assembly. However, `TranslateExtension` is `public`, allowing external assemblies to use the XAML extension if they reference this assembly.
4.  **Case Sensitivity:** The `ResourceManager.GetString` method called by `TranslateExtension` is typically case-sensitive regarding the resource key (depending on the underlying resource set implementation), though the constant `_key` is passed exactly as provided to the constructor.