public class Program var builder = WebApplication.CreateBuilder(args); builder.Services.AddScoped<IService, Service>(); if (result is null) return NotFound(); await mediator.Send(command, ct); record Blog(string Slug, string Title); try { /* ... */ } catch (Exception ex) { } Task<IReadOnlyList<BlogSummary>> [HttpGet("/api/blogs")] => { } <> && || ?? ();