tag is preserved *@
@HtmlLocalizer["TermsNotice", Model.UserName]
```text
### When to Use Each
| Interface | Scope | HTML-Safe | Blazor | MVC |
| --------------------- | ------------------ | --------------- | ------ | --- |
| `IStringLocalizer` | Everywhere | No (plain text) | Yes | Yes |
| `IViewLocalizer` | View-local strings | No | **No** | Yes |
| `IHtmlLocalizer` | HTML in resources | Yes | **No** | Yes |
### Namespace Resolution
If resource lookup fails, check namespace alignment. `IStringLocalizer` resolves resources using the full type name
of `T` relative to the `ResourcesPath`. Use `RootNamespaceAttribute` to fix namespace/assembly mismatches:
```csharp
[assembly: RootNamespace("MyApp")]
```csharp
---
## Date, Number, and Currency Formatting
### CultureInfo
`CultureInfo` is the central class for culture-specific formatting. Two distinct properties control behavior:
- `CultureInfo.CurrentCulture` -- controls **formatting** (dates, numbers, currency)
- `CultureInfo.CurrentUICulture` -- controls **resource lookup** (which `.resx` file)
```csharp
// Always pass explicit CultureInfo -- never rely on thread defaults in server code
var date = DateTime.Now.ToString("D", new CultureInfo("fr-FR"));
// "vendredi 14 fevrier 2026"
var price = 1234.56m.ToString("C", new CultureInfo("de-DE"));
// "1.234,56 EUR" (uses NumberFormatInfo.CurrencySymbol)
var number = 1234567.89.ToString("N2", new CultureInfo("ja-JP"));
// "1,234,567.89"
```text
### Server-Side Best Practices
```csharp
// Use useUserOverride: false in server scenarios to avoid
// picking up user-customized formats
var culture = new CultureInfo("en-US", useUserOverride: false);
// Set culture per-request (ASP.NET Core middleware handles this)
CultureInfo.CurrentCulture = culture;
CultureInfo.CurrentUICulture = culture;
```text
### Format Specifiers
| Specifier | Type | Example (en-US) | Example (de-DE) |
| --------- | ---------- | ------------------------- | ------------------------- |
| `"d"` | Short date | 2/14/2026 | 14.02.2026 |
| `"D"` | Long date | Friday, February 14, 2026 | Freitag, 14. Februar 2026 |
| `"C"` | Currency | $1,234.56 | 1.234,56 EUR |
| `"N2"` | Number | 1,234.57 | 1.234,57 |
| `"P1"` | Percent | 85.5% | 85,5 % |
---
## RTL Support
### Detecting RTL Cultures
```csharp
bool isRtl = CultureInfo.CurrentCulture.TextInfo.IsRightToLeft;
// true for: ar-*, he-*, fa-*, ur-*, etc.
```csharp
### Per-Framework RTL Patterns
**Blazor:** No native `FlowDirection` -- use CSS `dir` attribute:
```javascript
// wwwroot/js/app.js
window.setDocumentDirection = dir => (document.documentElement.dir = dir);
```javascript
```csharp
// Set via named JS function (avoid eval -- causes CSP unsafe-eval violations)
await JSRuntime.InvokeVoidAsync("setDocumentDirection",
isRtl ? "rtl" : "ltr");
```csharp
For deep Blazor component patterns, see [skill:dotnet-blazor-components].
**MAUI:** `FlowDirection` property on `VisualElement` and `Window`:
```csharp
// Set at window level -- cascades to all children
window.FlowDirection = isRtl
? FlowDirection.RightToLeft
: FlowDirection.LeftToRight;
```text
Android requires `android:supportsRtl="true"` in AndroidManifest.xml (set by default in MAUI). For deep MAUI patterns,
see [skill:dotnet-maui-development].
**Uno Platform:** Inherits WinUI `FlowDirection` model:
```xml
## Detailed Examples
See [references/detailed-examples.md](references/detailed-examples.md) for complete code samples and advanced patterns.