A brief example showing how to localize ViewComponents
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A brief example that I built for a student to illustrate techniques for localizing ASP.NET Core 2.0 ViewComponents.

Quick Overview

  • Resource files (*.resx) follow a specific naming convention
    • Resources are specific to a given component (i.e. GreetingViewComponent in this example)
    • If the component's source file exists in a subfolder hierarchy, the resource filename must reflect this:
      • Given a component called GreetingViewComponent that does not live in a subfolder, the Resource filename should be GreetingViewComponent.[language].resx
        • Given a component called GreetingViewComponent that lives in a Components subfolder, the Resource filename should be Components.GreetingViewComponent.[language].resx
    • Each component should also have a default .resx file that does not specify a language. It doesn't need to contain any values (assuming you set a DefaultRequestCulture in Startup.Configure()) - it exists as a workaround to an issue with .NET Core resources.
  • The ASP.NET Core MVC application needs to be configured to use resources in Startup.cs:
// In Configuration method:
app.UseRequestLocalization(new RequestLocalizationOptions
                                           DefaultRequestCulture = new RequestCulture("en-US"),
                                           SupportedCultures = supportedCultures,
                                           SupportedUICultures = supportedCultures,
                                           // Disable Accept-Language provider (See notes section)
                                           RequestCultureProviders =
                                               new List<IRequestCultureProvider>
                                                   new QueryStringRequestCultureProvider(),
                                                   new CookieRequestCultureProvider()

            app.UseMvc(routes => { routes.MapRoute("default", "{controller=Home}/{action=Index}/{id?}"); });
// In ConfigureServices method:
services.AddLocalization(p => { p.ResourcesPath = "Resources"; });
            services.Configure<RequestLocalizationOptions>(options =>
                                                               options.DefaultRequestCulture = new RequestCulture("en-US");
                                                               options.SupportedCultures = supportedCultures;
                                                               options.SupportedUICultures = supportedCultures;
  • The application must be configured with a list of supported cultures, which are injected when we configure the RequestLocalizationOptions.

Fun Stuff:

  • After you build the project, if you look in the bin folder, you'll see one folder for each supported language. Each folder contains a .dll containing the resources for that specific language.
  • You can also change the culture that is used for a given request by appending a culture URL parameter, i.e. http://localhost:28645/?culture=en-US


This project explicitly disables MVC's handler for Accept-Language headers in order to make it easier to override the current culture configured in the user's browser.