Culture-Aware Data Formatting in WPF

Format dates, numbers, and currency based on user's culture preferences.

1. Culture Formatting Overview

Data Type en-US ko-KR de-DE

Date (d) 1/21/2026 2026-01-21 21.01.2026

Currency (C) $1,234.56 ₩1,235 1.234,56 €

Number (N2) 1,234.56 1,234.56 1.234,56

Percent (P) 75.00% 75.00% 75,00 %

2. XAML Formatting

2.1 Date Formatting

<!-- Short date (culture-aware) --> <TextBlock Text="{Binding Date, StringFormat={}{0:d}}"/>

<!-- Long date --> <TextBlock Text="{Binding Date, StringFormat={}{0:D}}"/>

<!-- Custom format (not culture-aware) --> <TextBlock Text="{Binding Date, StringFormat={}{0:yyyy-MM-dd}}"/>

<!-- Date and time --> <TextBlock Text="{Binding Date, StringFormat={}{0:g}}"/>

2.2 Number Formatting

<!-- Number with 2 decimal places --> <TextBlock Text="{Binding Amount, StringFormat={}{0:N2}}"/>

<!-- Number with no decimals --> <TextBlock Text="{Binding Count, StringFormat={}{0:N0}}"/>

<!-- Fixed decimal places --> <TextBlock Text="{Binding Value, StringFormat={}{0:F2}}"/>

2.3 Currency Formatting

<!-- Currency (culture-aware symbol and format) --> <TextBlock Text="{Binding Price, StringFormat={}{0:C}}"/>

<!-- Currency with no decimals --> <TextBlock Text="{Binding Price, StringFormat={}{0:C0}}"/>

2.4 Percent Formatting

<!-- Percent (multiplies by 100) --> <TextBlock Text="{Binding Rate, StringFormat={}{0:P}}"/>

<!-- Percent with 1 decimal --> <TextBlock Text="{Binding Rate, StringFormat={}{0:P1}}"/>

3. Code Formatting

3.1 Using Current Culture

// Uses Thread.CurrentThread.CurrentCulture var dateStr = DateTime.Now.ToString("d"); var currencyStr = price.ToString("C"); var numberStr = amount.ToString("N2");

3.2 Specific Culture

var koKr = new CultureInfo("ko-KR"); var deDE = new CultureInfo("de-DE");

// Korean formatting var dateKr = DateTime.Now.ToString("d", koKr); // 2026-01-21 var currencyKr = price.ToString("C", koKr); // ₩1,234

// German formatting var dateDE = DateTime.Now.ToString("d", deDE); // 21.01.2026 var currencyDE = price.ToString("C", deDE); // 1.234,56 €

3.3 Invariant Culture (for data storage)

// Always use InvariantCulture for serialization var dataStr = value.ToString(CultureInfo.InvariantCulture); var parsed = double.Parse(dataStr, CultureInfo.InvariantCulture);

4. Localized Enum Converter

namespace MyApp.Converters;

using System; using System.Globalization; using System.Windows.Data; using System.Windows.Markup; using MyApp.Resources;

public sealed class LocalizedEnumConverter : MarkupExtension, IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { if (value is Enum enumValue) { var key = $"{enumValue.GetType().Name}_{enumValue}"; return Strings.ResourceManager.GetString(key, culture) ?? enumValue.ToString(); } return value?.ToString() ?? string.Empty; }

public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    => throw new NotSupportedException();

public override object ProvideValue(IServiceProvider serviceProvider) => this;

}

Resource file entries:

<!-- Strings.resx --> <data name="Status_Active"><value>Active</value></data> <data name="Status_Inactive"><value>Inactive</value></data>

<!-- Strings.ko-KR.resx --> <data name="Status_Active"><value>활성</value></data> <data name="Status_Inactive"><value>비활성</value></data>

Usage:

<TextBlock Text="{Binding Status, Converter={local:LocalizedEnumConverter}}"/>

5. Localized String Resources

5.1 LocalizedStrings Class

namespace MyApp.Resources;

public sealed class LocalizedStrings { public Strings Strings { get; } = new(); }

5.2 App.xaml Registration

<Application.Resources> <local:LocalizedStrings x:Key="Loc"/> </Application.Resources>

5.3 XAML Usage

<TextBlock Text="{Binding Source={StaticResource Loc}, Path=Strings.WelcomeMessage}"/> <Button Content="{Binding Source={StaticResource Loc}, Path=Strings.SaveButton}"/>

6. Localized Images

6.1 File Structure

Resources/ ├── Images/ │ ├── flag.png (default/en-US) │ ├── flag.ko-KR.png (Korean) │ └── flag.ja-JP.png (Japanese)

6.2 Helper Class

public static class LocalizedImageHelper { public static string GetLocalizedPath(string basePath) { var culture = Thread.CurrentThread.CurrentUICulture.Name; var dir = Path.GetDirectoryName(basePath) ?? ""; var name = Path.GetFileNameWithoutExtension(basePath); var ext = Path.GetExtension(basePath);

    var localizedPath = Path.Combine(dir, $"{name}.{culture}{ext}");

    return File.Exists(localizedPath) ? localizedPath : basePath;
}

}

7. Format Specifiers Reference

Specifier Description Example (en-US)

d Short date 1/21/2026

D Long date Tuesday, January 21, 2026

t Short time 2:30 PM

T Long time 2:30:00 PM

g General (short) 1/21/2026 2:30 PM

G General (long) 1/21/2026 2:30:00 PM

C Currency $1,234.56

N Number 1,234.56

P Percent 75.00%

F Fixed-point 1234.56

8. References

• Standard Numeric Format Strings - Microsoft Docs

• Standard Date and Time Format Strings - Microsoft Docs

• CultureInfo Class - Microsoft Docs