c# - Loading and registering API Controllers From Class Library in ASP.NET core

Question

I am using ASP.NET Core 1.0.1. I have the following

• A class library that uses "Microsoft.AspNetCore.Mvc": "1.0.1" in order to develop my controllers:

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

namespace CoreAPIsLibrary.Controllers
{

    [Route("api/[controller]")]
    public class ValuesContoller : Controller
    { 
        public string Get()
        {
            return "value";
        }

        // GET api/values/5
        [HttpGet("{id}")]
        public string Get(int id)
        {
            return "value";
        }

        // POST api/values
        [HttpPost]
        public void Post([FromBody]string value)
        {
        }

        // PUT api/values/5
        [HttpPut("{id}")]
        public void Put(int id, [FromBody]string value)
        {
        }
    }
}

Answer 1

Maybe you're doing something wrong. So, here are the steps to make this work.

• Create a new project: ASP.NET Core Web Application (.NET Core);
• Choose the Web API template;
• Run the project and access the "api/values" to make sure it's working;
• Add a new project to the solution named ClassLibrary: Class Library (.NET Core);
• Delete the Class1.cs and create a TestController.cs class;

• Add the MVC dependency in the project.json from the ClassLibrary project:

  "dependencies": {
    "NETStandard.Library": "1.6.0",
    "Microsoft.AspNetCore.Mvc": "1.0.0"
  },
  

• Update your TestController.cs to be like this:

  [Route("api/[controller]")]
  public class TestController : Controller{
    [HttpGet]
    public IEnumerable<string> Get() {
      return new string[] { "test1", "test2" };
    }
  }
  

• Add the reference to ClassLibrary in your WebAPI Project: right-click on "References"->"Add Reference..." or update your project.json like this:

  "dependencies": {
    "Microsoft.NETCore.App": {
      "version": "1.0.0",
      "type": "platform"
    },
    "Microsoft.AspNetCore.Mvc": "1.0.0",
    "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.0",
    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0",
    "Microsoft.Extensions.Configuration.FileExtensions": "1.0.0",
    "Microsoft.Extensions.Configuration.Json": "1.0.0",
    "Microsoft.Extensions.Logging": "1.0.0",
    "Microsoft.Extensions.Logging.Console": "1.0.0",
    "Microsoft.Extensions.Logging.Debug": "1.0.0",
    "Microsoft.Extensions.Options.ConfigurationExtensions": "1.0.0",
    "ClassLibrary": "1.0.0-*"
  },
  

• Update your Startup.cs ConfigureServices method:

  public void ConfigureServices(IServiceCollection services) {
    services.AddMvc().AddApplicationPart(Assembly.Load(new AssemblyName("ClassLibrary")));
  }
  

• Run the project again and access "api/test";