public interface IResourceManager
    {
         IStringLocalizer Localizer { get; }
    }

 public class SchoolResourceManager : IResourceManager
    {       
        public SchoolResourceManager (IStringLocalizerFactory factory)
        {
            Localizer = factory.Create(typeof(SchoolResource));
        }
        public IStringLocalizer Localizer { get; }
    }

 public class ArtSchoolResourceManager : IResourceManager
    {       
        public ArtSchoolResourceManager(IStringLocalizerFactory factory)
        {
            Localizer = factory.Create(typeof(ArtSchoolResource));
        }
        public IStringLocalizer Localizer { get; }
    }

{
  "ConnectionStrings": {
    "str": "..."
  },
  "Type": "ArtSchool" 
}

 public void ConfigureServices(IServiceCollection services)
{
            services.AddLocalization();
            services.AddSingleton<SchoolResourceManager>();
            services.AddSingleton<ArtSchoolResourceManager>();
            services.AddSingleton<IResourceManager>(cnf =>
            {
                var type = Configuration.GetSection("Type").Value;
                if (type == "ArtSchool")
                    return cnf.GetServices<ArtSchoolResourceManager>().FirstOrDefault();
                    

                return cnf.GetServices<SchoolResourceManager>().FirstOrDefault();
            });
}

@inject IResourceManager ResourceManager

<h2>@ResourceManager.Localizer["Student"] : </h2>

 public class TestController : Controller
    {        
        private readonly IResourceManager _resourceManager;
       
        public TestController (IResourceManager resourceManager)
        {
             _resourceManager = resourceManager;
        }
}

What is .NET Core?
What is ASP.NET Core?
Can ASP.NET Core work with the .NET framework?
What is Kestrel?
Dependency Injection in ASP.NET Core?
The configuration in ASP.NET Core?
Talk about Logging in ASP.NET Core?
Explain Middleware in ASP.NET Core?
Explain startup process in ASP.NET Core?