What replaces WCF in .Net Core?

Question

I am used to creating a .Net Framework console application and exposing a Add(int x, int y) function via a WCF service from scratch with Class Library (.Net Fra

Answer 1

You can also self-host ASP.NET Core Web API.

  
    Exe
    netcoreapp3.1
  

  
    
    
    
  

// Program.cs
using System.IO;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;

namespace SelfHosted
{
    class Program
    {
        static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args)
        {
            // see: https://docs.microsoft.com/en-us/aspnet/core/fundamentals/host/generic-host?view=aspnetcore-3.1
            return Host.CreateDefaultBuilder(args)
                .ConfigureHostConfiguration(configHost =>
                {
                    configHost.SetBasePath(Directory.GetCurrentDirectory());
                    configHost.AddJsonFile("appsettings.json", optional: true);
                    configHost.AddEnvironmentVariables(prefix: "SelfHosted_");
                    configHost.AddCommandLine(args);
                })
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.CaptureStartupErrors(true);
                    webBuilder.UseStartup();
                });
        }
    }
}

// Startup.cs
using System;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

namespace SelfHosted
{
    public class Startup
    {
        public Startup(IConfiguration configuration, IWebHostEnvironment env)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        public void ConfigureServices(IServiceCollection services)
        {
            // see: https://github.com/aspnet/AspNetCore.Docs/tree/master/aspnetcore/web-api/index/samples/3.x
            services.AddControllers();
        }

        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Error");
                app.UseHsts();
            }

            app.UseHttpsRedirection();
            app.UseStaticFiles();

            app.UseRouting();

            app.UseAuthorization();

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

// Controllers\TestController.cs
using System.Net.Mime;
using Microsoft.AspNetCore.Mvc;

namespace SelfHosted.Controllers
{
    [ApiController]
    [Produces(MediaTypeNames.Application.Json)]
    [Route("[controller]")]
    public class HelloController : SelfHostedControllerBase
    {
        [HttpGet]
        public ActionResult HelloWorld() => "Hello World!";

        [HttpGet("{name}")]
        public ActionResult HelloName(string name) => $"Hello {name}!";
    }
}