69 lines
4.0 KiB
Markdown
69 lines
4.0 KiB
Markdown
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---
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source_files:
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- DataPRO/Modules/TestSetups/Diagnostics/Resources/TranslateExtension.cs
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- DataPRO/Modules/TestSetups/Diagnostics/Resources/StringResources.Designer.cs
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generated_at: "2026-04-16T04:50:59.405186+00:00"
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model: "Qwen/Qwen3-Coder-Next-FP8"
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schema_version: 1
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sha256: "8602aa2c75632a3b"
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---
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# Resources
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## Documentation: `TranslateExtension` Markup Extension
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---
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### 1. Purpose
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The `TranslateExtension` class is a WPF `MarkupExtension` used to resolve localized string resources at XAML runtime. It enables declarative binding to localized strings in UI markup by accepting a resource key and returning the corresponding localized value from the `StringResources` strongly-typed resource class. This allows UI text to be localized without hardcoding strings in XAML, supporting multi-language deployments of the diagnostics module.
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---
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### 2. Public Interface
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#### `TranslateExtension(string key)`
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- **Signature**: `public TranslateExtension(string key)`
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- **Behavior**: Constructor. Stores the provided resource key for later lookup. Does not perform validation beyond null/empty checks during `ProvideValue`.
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#### `ProvideValue(IServiceProvider serviceProvider)`
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- **Signature**: `public override object ProvideValue(IServiceProvider serviceProvider)`
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- **Behavior**:
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- If `_key` is `null` or empty, returns `"#stringnotfound#"`.
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- Otherwise, attempts to retrieve the string value from `StringResources.ResourceManager.GetString(_key)`.
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- If the resource is not found (i.e., `GetString` returns `null`), returns `"#stringnotfound# " + _key` (note the trailing space).
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- Returns a `string` (as indicated by `[MarkupExtensionReturnType(typeof(string))]`).
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---
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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`.
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- Missing or empty keys **always** yield `"#stringnotfound#"` (no concatenation with key).
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- Missing resources **always** yield `"#stringnotfound# <key>"` (with a space between the prefix and key).
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- No exceptions are thrown during `ProvideValue`—errors are silently handled via fallback strings.
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- Resource lookup uses the default `ResourceManager` instance and current UI culture (unless overridden via `StringResources.Culture`).
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---
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### 4. Dependencies
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#### Dependencies *of* `TranslateExtension`:
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- `System.Windows.Markup.MarkupExtension` (base class, part of WPF).
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- `Diagnostics.Resources.StringResources` (specifically its `ResourceManager` property and `GetString(string)` method).
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- `System` (for `string.IsNullOrEmpty`, `object.ReferenceEquals`, etc.).
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#### Dependencies *on* `TranslateExtension`:
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- XAML files in the diagnostics module (e.g., `.xaml` files) that use `{local:Translate KeyName}` syntax to bind UI text.
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- `StringResources.Designer.cs` must be compiled and available at runtime (auto-generated; relies on corresponding `.resx` file, not visible here).
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---
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### 5. Gotchas
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- **No null-safety for `_key` beyond emptiness**: Passing `null` as `_key` is allowed in the constructor but results in `"#stringnotfound#"` at runtime.
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- **Ambiguous fallbacks**: Both missing keys and empty keys produce `"#stringnotfound#"`, making debugging harder without inspecting the key itself.
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- **Hardcoded prefix**: The `"#stringnotfound#"` string is hardcoded and not configurable. If this prefix appears in actual resources, it may cause confusion.
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- **No caching of resolved values**: Each `ProvideValue` call re-invokes `ResourceManager.GetString`, which may have performance implications in high-frequency scenarios (though `ResourceManager` itself caches internally).
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- **Culture dependency**: Behavior depends on the current UI thread’s `Culture` (via `StringResources.Culture`). If the UI culture changes dynamically, existing bindings may not update unless re-evaluated.
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- **No compile-time key validation**: Typos in XAML resource keys (e.g., `{local:Translate Channles}`) will only surface at runtime as `"#stringnotfound# Channles"`.
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None identified beyond the above.
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