C# 7 and .NET: Designing Modern Cross-platform Applications

Modifying the NorthwindService

Open the Part3 solution, and expand the NorthwindService project.

In the Controllers folder, right-click and choose Add | New Item..., select Web API Controller Class, name it as CategoriesController.cs, and modify it to have two HttpGet methods that use the Northwind database context to retrieve all categories, or a single category using its ID, as shown in the following code:

using Microsoft.AspNetCore.Mvc;using Packt.CS7;using System.Collections.Generic;using System.Linq;namespace NorthwindService.Controllers{   [Route("api/[controller]")]   public class CategoriesController : Controller   {      private readonly Northwind db;      public CategoriesController(Northwind db)      {         this.db = db;      }      // GET: api/categories [HttpGet] ...