[ASP.Net] Web API

  using HelloEmptyWebAPI.Models;
  using Microsoft.AspNetCore.Http;
  using Microsoft.AspNetCore.Mvc;
  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Threading.Tasks;

  namespace HelloEmptyWebAPI.Controllers
  {
    [Route("api/[controller]")]
    [ApiController]
    public class ValuesController : ControllerBase
    {
      [HttpGet]
      public List<HelloMessage> Get()
      {
        List<HelloMessage> messages = new List<HelloMessage>();
        messages.Add(new HelloMessage() { Message = "Hello Web API 1!" });
        messages.Add(new HelloMessage() { Message = "Hello Web API 2!" });
        messages.Add(new HelloMessage() { Message = "Hello Web API 3!" });

        return messages;
      }
    }
  }

  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Threading.Tasks;

  namespace HelloEmptyWebAPI.Models
  {
    public class HelloMessage
    {
      public string Message { get; set; }
    }
  }

  using Microsoft.AspNetCore.Builder;
  using Microsoft.AspNetCore.Hosting;
  using Microsoft.AspNetCore.Http;
  using Microsoft.Extensions.DependencyInjection;
  using Microsoft.Extensions.Hosting;
  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Threading.Tasks;

  namespace HelloEmptyRazor
  {
    public class Startup
    {
      // This method gets called by the runtime. Use this method to add services to the container.
      // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
      public void ConfigureServices(IServiceCollection services)
      {
        services.AddControllers();
      }

      // 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();
        }

        app.UseRouting();

        app.UseEndpoints(endpoints =>
        {
          endpoints.MapControllers();
        }
      }
    }
  }

  [Route("api/[controller]")]

  [ApiController]

  services.AddControllers();
  app.UseEndpoints(endpoints =>
  {
    endpoints.MapControllers();
  });