Localising Data Annotation Attributes in Razor Pages

The first article looked at how to work with cultures, and the second covered the basics of using resource files for static content translations.

This is the third article in a series that explores various aspects of localisation in ASP.NET Core Razor Pages applications. The first article looked at how to work with cultures, and the second covered the basics of using resource files for static content translations. In this article, I explain how to provide localised resources for form labels and validation error messages for PageModel properties that have Data Annotation attributes applied to them.

The application in this article is the same one that has featured in the previous articles. It's built using the standard Razor Pages 3.1 project template with no authentication. Many of the concepts in this article were originally introduced in the previous article, so you should read that first.

The first three steps that follow demonstrate the minimum configuration to enable localisation using resources. If you are continuing from the previous article, you will have covered those:

1. In ConfigureServices, localization is added to the DI container, specifying the location of resources in the application, and the cultures supported by the application are configured:

public void ConfigureServices(IServiceCollection services)
{
    services.AddLocalization(options => options.ResourcesPath = "resources");

    services.Configure<RequestLocalizationOptions>(options =>
    {
        var supportedCultures = new[]
        {
            new CultureInfo("en"),
            new CultureInfo("de"),
            new CultureInfo("fr"),
            new CultureInfo("es"),
            new CultureInfo("ru"),
            new CultureInfo("ja"),
            new CultureInfo("ar"),
            new CultureInfo("zh"),
            new CultureInfo("en-GB")
        };
        options.DefaultRequestCulture = new RequestCulture("en-GB");
        options.SupportedCultures = supportedCultures;
        options.SupportedUICultures = supportedCultures;
    });

    services.AddSingleton<CommonLocalizationService>();

}

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