How to prevent Cross-Site Scripting (XSS) in ASP.NET Core?

There is a link for preventing XSS in .Net Core 2.1.

It uses some code like below which I don't understand it at all.

services.AddSingleton<HtmlEncoder>(
     HtmlEncoder.Create(allowedRanges: new[] { UnicodeRanges.BasicLatin,
                                               UnicodeRanges.CjkUnifiedIdeographs }));

But it is for Razor, I don't use Razor. My front end is using Angular. 

So how to apply it to prevent XSS in .net core 2.1?

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    public void ConfigureServices(IServiceCollection services)
    {
        var connectionString = configuration["myConnectionString"];
        services.AddCors();
        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
        service.AddDbContext<MyDbContext>(options => options.UseSqlServer(connectionString);
    }

    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Error");
            app.UseHsts();
        }

        app.UseHttpsRedirection();
        app.UseStaticFiles();

        app.UseRouting();
        app.UseAuthorization();
       
    }
}

Thanks.