using Microsoft.Extensions.DependencyInjection;

namespace CoreIocSample02.Controllers
{
    public class HomeController : Controller
    {
        public IActionResult Privacy()
        {
            var myDisposableService = this.HttpContext.RequestServices.GetRequiredService<IMyDisposableService>();
            myDisposableService.Run();
            return View();
        }
    }
}

public class ApiExceptionFilter : ExceptionFilterAttribute  
{  
    private ILogger<ApiExceptionFilter> _logger;  
    private IHostingEnvironment _environment;  
    private IConfiguration _configuration;  
  
    public ApiExceptionFilter(IHostingEnvironment environment, IConfiguration configuration, ILogger<ApiExceptionFilter> logger)  
    {  
        _environment = environment;  
         _configuration = configuration;  
         _logger = logger;  
    }

using Microsoft.Extensions.DependencyInjection;
using Microsoft.AspNetCore.Mvc.Filters;
using Microsoft.Extensions.Logging;

namespace Filters
{
    public class ApiExceptionFilter : ExceptionFilterAttribute
    {
        public override void OnException(ExceptionContext context)
        {
            var logger = context.HttpContext.RequestServices.GetRequiredService<ILogger<ApiExceptionFilter>>();
            logger.LogError(context.Exception, context.Exception.Message);
            base.OnException(context);
        }
    }
}

using Microsoft.Extensions.DependencyInjection;
using System.ComponentModel.DataAnnotations;
using CoreIocServices;

namespace Test
{
    public class CustomValidationAttribute : ValidationAttribute
    {
        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
            var service = validationContext.GetRequiredService<IMyDisposableService>();
            // use service
            // ... validation logic
        }
    }
}

namespace Test
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddSingleton<ITokenGenerator, TokenGenerator>();
        }

namespace Test
{
    public class Program
    {
        public static void Main(string[] args)
        {
            IWebHost webHost = CreateWebHostBuilder(args).Build();

            var tokenGenerator = webHost.Services.GetRequiredService<ITokenGenerator>();
            string token =  tokenGenerator.GetToken();
            System.Console.WriteLine(token);

            webHost.Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>();
    }
}

namespace Microsoft.AspNetCore.Hosting
{
    public interface IWebHost : IDisposable
    {
        IServiceProvider Services { get; }
    }
}

namespace CoreIocSample02
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            var scopeFactory = services.BuildServiceProvider().GetRequiredService<IServiceScopeFactory>();
            using (var scope = scopeFactory.CreateScope())
            {
                var provider = scope.ServiceProvider;
                using (var dbContext = provider.GetRequiredService<ApplicationDbContext>())
                {
                    // ...
                }
            }
        }

public class Startup 
{ 
    public void ConfigureServices(IServiceCollection services) { } 
  
    public void Configure(IApplicationBuilder app, IAmACustomService customService) 
    { 
        // ....    
    }         
}

namespace CoreIocSample02
{
    public class Startup
    {
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            var scopeFactory = app.ApplicationServices.GetRequiredService<IServiceScopeFactory>();
            using (var scope = scopeFactory.CreateScope())
            {
                var provider = scope.ServiceProvider;
                using (var dbContext = provider.GetRequiredService<ApplicationDbContext>())
                {
                    //...
                }
            }