// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
 services.AddControllersWithViews(config=> 
 {
  Console.WriteLine("execute C");
  //config.Filters.Add(new AsyncAuthorizationFilter());
  config.Filters.Add(new AuthorizationFilter());
  config.Filters.Add(new ResourceFilter());
  //config.Filters.Add(new AsyncResourceFilter());
  config.Filters.Add(new ActionFilter());
  //config.Filters.Add(new AsyncActionFilter());
  config.Filters.Add(new ResultFilter());
  //config.Filters.Add(new AsyncResultFilter());
  config.Filters.Add(new ExceptionFilter());
  //config.Filters.Add(new AsyncExceptionFilter());
  Console.WriteLine("execute D");
 });
 services.AddSession(config=> {
  Console.WriteLine("execute E");
 });
}

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
 if (env.IsDevelopment())
 {
  app.UseDeveloperExceptionPage();
 }
 else
 {
  app.UseExceptionHandler("/Home/Error");
 }
 app.UseStaticFiles();
 app.UseRouting();
 app.UseAuthorization();
 app.Use(async (context, next) =>
 {
  Console.WriteLine("execute F");
  await context.Response.WriteAsync("hello world");
  Console.WriteLine("execute G");
 });
 //app.UseSession();
 app.UseEndpoints(endpoints =>
 {
  Console.WriteLine("execute A");
  endpoints.MapControllerRoute(
   name: "default",
   pattern: "{controller=Home}/{action=Index}/{id?}");
  Console.WriteLine("execute B");
 });
}

public class AuthorizationFilter: IAuthorizationFilter
{
 public void OnAuthorization(AuthorizationFilterContext context)
 {
  context.HttpContext.Response.WriteAsync("authorization filter \r");
 }
}

public class AsyncAuthorizationFilter: IAsyncAuthorizationFilter
{
 public async Task OnAuthorizationAsync(AuthorizationFilterContext context)
 {
  await context.HttpContext.Response.WriteAsync($"async authorization filter in \r");
 }
}

public class ResourceFilter: IResourceFilter
{
 public void OnResourceExecuting(ResourceExecutingContext context)
 {
  context.HttpContext.Response.WriteAsync($"resource executing\r");
 }
 public void OnResourceExecuted(ResourceExecutedContext context)
 {
  context.HttpContext.Response.WriteAsync($"resource executed \r");
 }
}

public class AsyncResourceFilter: IAsyncResourceFilter
{
 public async Task OnResourceExecutionAsync(ResourceExecutingContext context, ResourceExecutionDelegate next)
 {
  await context.HttpContext.Response.WriteAsync($" async resource filter in. \r\n");
  await next();
  await context.HttpContext.Response.WriteAsync($"async resource filter out. \r\n");
 }
}

public class ActionFilter: IActionFilter
{
 public void OnActionExecuting(ActionExecutingContext context)
 {
  context.HttpContext.Response.WriteAsync($"action executing \r");
 }

 public void OnActionExecuted(ActionExecutedContext context)
 {
  context.HttpContext.Response.WriteAsync($"action executed . \r");
 }
}

public async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
{
 await context.HttpContext.Response.WriteAsync($"async action execution in. \r\n");
 await next();
 await context.HttpContext.Response.WriteAsync($"async action execution out. \r\n");
}

public class ExceptionFilter: IExceptionFilter
{
 public void OnException(ExceptionContext context)
 {
  context.HttpContext.Response.WriteAsync($"exception \r");
 }
}

public class AsyncExceptionFilter: IAsyncExceptionFilter
{
 public Task OnExceptionAsync(ExceptionContext context)
 {
  context.HttpContext.Response.WriteAsync($"exception async \r");
  return Task.CompletedTask;
 }
}

public class ResultFilter: IResultFilter
{
 public void OnResultExecuting(ResultExecutingContext context)
 {
  context.HttpContext.Response.WriteAsync($"result executing\r");
 }
 public void OnResultExecuted(ResultExecutedContext context)
 {
  context.HttpContext.Response.WriteAsync($"result executed \r");
 }
}

public class AsyncResultFilter: IAsyncResultFilter
{
 public async Task OnResultExecutionAsync(ResultExecutingContext context, ResultExecutionDelegate next)
 {
  await context.HttpContext.Response.WriteAsync($"result execution async in \r");
  await next();
  await context.HttpContext.Response.WriteAsync($"result execution async out. \r");
 }
}

public IActionResult Privacy()
{
  throw new Exception("error");
}