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    FallbackCultureProvider

    ILocalization.FallbackCultureProvider is a property (IProvider<string, string[]>) that determines which cultures are to be used for fallback when resource for requested culture is not found.

    // Get culture provider
    IProvider<string, string[]> fallbackCultureProvider = Localization.Default.FallbackCultureProvider;
    // Retrieve fallback cultures
    string[] fallbackCultures = fallbackCultureProvider["fi-FI"];
    // Print fallback cultures in evaluation order
    WriteLine($"\"{String.Join("\" → \"", fallbackCultures)}\""); // "fi-FI" → "fi" → ""
    

    FallbackCultureProvider.Default provider returns following cultures:

    • Requested culture
    • Requested culture's parents
    • Culture from application assembly's System.Resources.NeutralResourcesLanguageAttribute.
    • Application's fallback culture parents
    • Invariant culture ""

    The default culture provider searches for System.Resources.NeutralResourcesLanguageAttribute from application assembly (not from class libraries).

    [assembly: System.Resources.NeutralResourcesLanguageAttribute("en-UK")] 
    

    If [NeutralResourcesLanguage] is detected, then its fallback cultures are also provided.

    // Get culture provider
    IProvider<string, string[]> fallbackCultureProvider = Localization.Default.FallbackCultureProvider;
    // Retrieve fallback cultures
    string[] fallbackCultures = fallbackCultureProvider["fi-FI"];
    // Print fallback cultures in evaluation order
    WriteLine($"\"{String.Join("\" → \"", fallbackCultures)}\""); // "fi-FI" → "fi" → "en-UK" → "en" → ""
    

    new FallbackCultureProvider(culture) creates culture provider that uses the specified fallback culture, or 'null' for none. It also returns invariant culture. This constructor does not use [NeutralResourcesLanguageAttribute].

    // Create localization
    ILocalization localization = new Localization()
        .SetFallbackCultureProvider(new FallbackCultureProvider("sv"));
    // Get fallback cultures
    string[] fallbackCultures = localization.FallbackCultureProvider["fi-FI"];
    // Print fallback cultures in evaluation order
    WriteLine($"\"{String.Join("\" → \"", fallbackCultures)}\""); // "fi-FI" → "fi" → "sv" → ""
    

    FallbackCultureProvider.Get(culture) gets or creates cached culture provider.

    // Create localization
    ILocalization localization = new Localization();
    // Assign culture provider "en"
    localization.FallbackCultureProvider = FallbackCultureProvider.Get("en");
    // Get fallback cultures
    string[] fallbackCultures = localization.FallbackCultureProvider["fi-FI"];
    // Print fallback cultures in evaluation order
    WriteLine($"\"{String.Join("\" → \"", fallbackCultures)}\""); // "fi-FI" → "fi" → "en" → ""
    

    FallbackCultureProvider.Invariant returns "" as fallback culture.

    // Create localization
    ILocalization localization = new Localization();
    // Assign culture provider "en"
    localization.FallbackCultureProvider = FallbackCultureProvider.Invariant;
    // Get fallback cultures
    string[] fallbackCultures = localization.FallbackCultureProvider["fi-FI"];
    // Print fallback cultures in evaluation order
    WriteLine($"\"{String.Join("\" → \"", fallbackCultures)}\""); // "fi-FI" → "fi" → "en" → ""
    

    Culture provider can be adapted from delegate.

    // Create fallback provider function
    Func<string, string[]> func = culture => new string[] { culture, "en", "" }.Distinct().ToArray();
    // Create provider
    IProvider<string, string[]> fallbackCultureProvider = Providers.Func(func).Cached();
    // Get fallback cultures
    string[] fallbackCultures = fallbackCultureProvider["fi"];
    // Print fallback cultures in evaluation order
    WriteLine($"\"{String.Join("\" → \"", fallbackCultures)}\""); // "fi" → "en" → ""
    

    FallbackCultureProvider.NoFallback is provider that does not use fallback.

    // Get culture provider
    IProvider<string, string[]> fallbackCultureProvider = FallbackCultureProvider.NoFallback;
    // Retrieve fallback cultures
    string[] fallbackCultures = fallbackCultureProvider["fi-FI"];
    // Print fallback cultures in evaluation order
    WriteLine($"\"{String.Join("\" → \"", fallbackCultures)}\""); // "fi-FI"
    

    The localization.FallbackCultureProvider is applied to all the providers in the 'localization'.

    // Create localization
    ILocalization localization = new Localization()
        .SetFallbackCultureProvider(FallbackCultureProvider.Default)
        .AddLines(new LocalizationReaderYaml.File("fallbackcultureprovider/fallbackcultureprovider.l.yaml"));
    // Get localizable text
    ILocalizableText localizable = localization.LocalizableTextCached["Namespace.HelloCasual"];
    // Cultures to print with
    foreach (string requested_culture in new string[] { "en", "en-NZ", "en-AU", "en-UK", "en-US", "en-CA" })
    {
        // Localize to culture
        ILocalizedText localized = localizable.Localize(requested_culture)?.Value!;
        // Get the culture where fallback landed to
        string supplied_culture = localized.Culture;
        // Print text
        WriteLine($"{requested_culture,-5} {supplied_culture,-5}: {localized.Print(null)}");
    }
    // en    en   : Hello fella
    // en-NZ en   : Hello fella
    // en-AU en-AU: Hello mate
    // en-UK en-UK: Hello chap
    // en-US en-US: Hello dude
    // en-CA en-CA: Hello buddy
    

    fallbackcultureprovider/fallbackcultureprovider.l.yaml [Demo]

    TemplateFormat: Detect
    
    Items:
    - Key: Namespace.HelloCasual
      Items:
      - Text: "Hello fella"
        Culture: en
      - Text: "Hello mate"
        Culture: en-AU
      - Text: "Hello chap"
        Culture: en-UK
      - Text: "Hello dude"
        Culture: en-US
      - Text: "Hello buddy"
        Culture: en-CA
    

    Full Example

    Full example
    using System.Globalization;
    using Avalanche.Localization;
    using Avalanche.Utilities.Provider;
    using static System.Console;
    
    class fallbackcultureprovider
    {
        public static void Run()
        {        
            {
                // <01>
                // Get culture provider
                IProvider<string, string[]> fallbackCultureProvider = Localization.Default.FallbackCultureProvider;
                // Retrieve fallback cultures
                string[] fallbackCultures = fallbackCultureProvider["fi-FI"];
                // Print fallback cultures in evaluation order
                WriteLine($"\"{String.Join("\" → \"", fallbackCultures)}\""); // "fi-FI" → "fi" → ""
                // </01>
            }
            {
                // <02>
                // Get culture provider
                IProvider<string, string[]> fallbackCultureProvider = Localization.Default.FallbackCultureProvider;
                // Retrieve fallback cultures
                string[] fallbackCultures = fallbackCultureProvider["fi-FI"];
                // Print fallback cultures in evaluation order
                WriteLine($"\"{String.Join("\" → \"", fallbackCultures)}\""); // "fi-FI" → "fi" → "en-UK" → "en" → ""
                // </02>
            }
            {
                // <03>
                // Create localization
                ILocalization localization = new Localization()
                    .SetFallbackCultureProvider(new FallbackCultureProvider("sv"));
                // Get fallback cultures
                string[] fallbackCultures = localization.FallbackCultureProvider["fi-FI"];
                // Print fallback cultures in evaluation order
                WriteLine($"\"{String.Join("\" → \"", fallbackCultures)}\""); // "fi-FI" → "fi" → "sv" → ""
                // </03>
            }
            {
                // <03A>
                // Create localization
                ILocalization localization = new Localization();
                // Assign culture provider "en"
                localization.FallbackCultureProvider = FallbackCultureProvider.Get("en");
                // Get fallback cultures
                string[] fallbackCultures = localization.FallbackCultureProvider["fi-FI"];
                // Print fallback cultures in evaluation order
                WriteLine($"\"{String.Join("\" → \"", fallbackCultures)}\""); // "fi-FI" → "fi" → "en" → ""
                // </03A>
            }
            {
                // <03B>
                // Create localization
                ILocalization localization = new Localization();
                // Assign culture provider "en"
                localization.FallbackCultureProvider = FallbackCultureProvider.Invariant;
                // Get fallback cultures
                string[] fallbackCultures = localization.FallbackCultureProvider["fi-FI"];
                // Print fallback cultures in evaluation order
                WriteLine($"\"{String.Join("\" → \"", fallbackCultures)}\""); // "fi-FI" → "fi" → "en" → ""
                // </03B>
            }
            {
                // <04>
                // Create fallback provider function
                Func<string, string[]> func = culture => new string[] { culture, "en", "" }.Distinct().ToArray();
                // Create provider
                IProvider<string, string[]> fallbackCultureProvider = Providers.Func(func).Cached();
                // Get fallback cultures
                string[] fallbackCultures = fallbackCultureProvider["fi"];
                // Print fallback cultures in evaluation order
                WriteLine($"\"{String.Join("\" → \"", fallbackCultures)}\""); // "fi" → "en" → ""
                // </04>
            }
            {
                // <05>
                // Get culture provider
                IProvider<string, string[]> fallbackCultureProvider = FallbackCultureProvider.NoFallback;
                // Retrieve fallback cultures
                string[] fallbackCultures = fallbackCultureProvider["fi-FI"];
                // Print fallback cultures in evaluation order
                WriteLine($"\"{String.Join("\" → \"", fallbackCultures)}\""); // "fi-FI"
                // </05>
            }
            {
                // <06>
                // Create localization
                ILocalization localization = new Localization()
                    .SetFallbackCultureProvider(FallbackCultureProvider.Default)
                    .AddLines(new LocalizationReaderYaml.File("fallbackcultureprovider/fallbackcultureprovider.l.yaml"));
                // Get localizable text
                ILocalizableText localizable = localization.LocalizableTextCached["Namespace.HelloCasual"];
                // Cultures to print with
                foreach (string requested_culture in new string[] { "en", "en-NZ", "en-AU", "en-UK", "en-US", "en-CA" })
                {
                    // Localize to culture
                    ILocalizedText localized = localizable.Localize(requested_culture)?.Value!;
                    // Get the culture where fallback landed to
                    string supplied_culture = localized.Culture;
                    // Print text
                    WriteLine($"{requested_culture,-5} {supplied_culture,-5}: {localized.Print(null)}");
                }
                // en    en   : Hello fella
                // en-NZ en   : Hello fella
                // en-AU en-AU: Hello mate
                // en-UK en-UK: Hello chap
                // en-US en-US: Hello dude
                // en-CA en-CA: Hello buddy
                // </06>
            }
        }
    }
    
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