How to work with Localization in asp.net core mvc

first : you must be write some configuration in startup.cs some code like this in ConfigureServices method:

public void ConfigureServices(IServiceCollection services)
    {
        //Dependency Injection for localization
        services.AddLocalization(options => options.ResourcesPath = "Resources"); 
        services.AddMvc().AddViewLocalization(LanguageViewLocationExpanderFormat.Suffix)
        .AddDataAnnotationsLocalization(options => {
         options.DataAnnotationLocalizerProvider = (type, factory) => factory.Create(typeof(SharedResource));
        });
    }

and some code like this in Configure method :

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        //add culture that you want
        var supportedCultures = new[]
        {
            new CultureInfo("en-US"),
            new CultureInfo("fa-IR")
        };
        //set DefalutCulture
        app.UseRequestLocalization(new RequestLocalizationOptions
        {
            DefaultRequestCulture = new RequestCulture("en-US"),
            // Formatting numbers, dates, etc.
            SupportedCultures = supportedCultures,
            // UI strings that we have localized.
            SupportedUICultures = supportedCultures
        }); 
    }

you must be create a directory in root of project . in this case i create directory with "Resources" name and create dictionary with controllers name for every Culture that you want like this:

//this name is that path you config in startup.cs

/Resources/Controllers.HomeController.en-US.resx /Resources/Controllers.HomeController.fa-IR.resx

in this case you must be create resource for every controller for every Culture you want.