public void ConfigureServices(IServiceCollection services)
{
   services.AddMvc();
   services.AddAntiforgery(options => options.HeaderName = "__RequestVerificationToken"); 
}

@inject Microsoft.AspNetCore.Antiforgery.IAntiforgery Xsrf

@functions{
    public string GetAntiXsrfRequestToken()
    {
        return Xsrf.GetAndStoreTokens(Context).RequestToken;
    }
}

[HttpPost]
[ApiExplorerSettings(GroupName = "v2")]
public void Post([FromBody]Product product)

System.AggregateException: 'Some services are not able to be constructed' 
InvalidOperationException: Error while validating the service descriptor 'ServiceType: Blog.Core.Services.Interfaces.IUserService Lifetime: Transient ImplementationType: Blog.Core.Services.UserService': Unable to resolve service for type 'Microsoft.AspNetCore.Mvc.Razor.IRazorViewEngine' while attempting to activate 'Blog.Core.Convertors.ViewRendererService'. 
InvalidOperationException: Unable to resolve service for type 'Microsoft.AspNetCore.Mvc.Razor.IRazorViewEngine' while attempting to activate 'Blog.Core.Convertors.ViewRendererService'.

public class MyDesignTimeServices : IDesignTimeServices
{
    public void ConfigureDesignTimeServices(IServiceCollection services)
        => services.AddEntityFrameworkSqlServerNetTopologySuite();
}

public void ConfigureServices(IServiceCollection services)
{
    services.AddMvc()
        .AddNewtonsoftJson();
}

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.Scan(scan => scan.FromAssemblyOf<IMessagesService>()
                                  .AddClasses()
                                  .AsMatchingInterface() // Registers all <`IClassName`, `ClassName`>
                                  .WithTransientLifetime()
               );

public void ConfigureServices(IServiceCollection services)
{
    services.AddTransient<IMyService, MyService>();
}

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    app.UseSignalR(routes =>
            {
                routes.MapHub<MessageHub>(path: "/message");
            });

public class EmailController : Controller 
{   
   private readonly Lazy<IEmailService> _emailService; 
   public EmailController(Lazy<IEmailService> emailService)   
   {        
       _emailService = emailService;
   }