WebApi Test

Customer.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace WebApiTest.Models
{
    public class Customer
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public virtual ICollection<Order> Orders { get; set; }
    }
}

CustomersController.cs

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity.Infrastructure;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web;
using System.Web.Http;
using WebApiTest.Models;
using WebApiTest.Models.DAL;

namespace WebApiTest.Controllers
{
    public class CustomersController : ApiController
    {
        private ModelDbContext db = new ModelDbContext();

        // GET api/Customer
        public IEnumerable<Customer> GetCustomers()
        {
            return db.Customers.AsEnumerable();
        }

        // GET api/Customer/5
        public Customer GetCustomer(int id)
        {
            Customer customer = db.Customers.Find(id);
            if (customer == null)
            {
                throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.NotFound));
            }

            return customer;
        }

        // PUT api/Customer/5
        public HttpResponseMessage PutCustomer(int id, Customer customer)
        {
            if (ModelState.IsValid && id == customer.Id)
            {
                db.Entry(customer).State = EntityState.Modified;

                try
                {
                    db.SaveChanges();
                }
                catch (DbUpdateConcurrencyException)
                {
                    return Request.CreateResponse(HttpStatusCode.NotFound);
                }

                return Request.CreateResponse(HttpStatusCode.OK, customer);
            }
            else
            {
                return Request.CreateResponse(HttpStatusCode.BadRequest);
            }
        }

        // POST api/Customer
        public HttpResponseMessage PostCustomer(Customer customer)
        {
            if (ModelState.IsValid)
            {
                db.Customers.Add(customer);
                db.SaveChanges();

                HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.Created, customer);
                response.Headers.Location = new Uri(Url.Link("DefaultApi", new { id = customer.Id }));
                return response;
            }
            else
            {
                return Request.CreateResponse(HttpStatusCode.BadRequest);
            }
        }

        // DELETE api/Customer/5
        public HttpResponseMessage DeleteCustomer(int id)
        {
            Customer customer = db.Customers.Find(id);
            if (customer == null)
            {
                return Request.CreateResponse(HttpStatusCode.NotFound);
            }

            db.Customers.Remove(customer);

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateConcurrencyException)
            {
                return Request.CreateResponse(HttpStatusCode.NotFound);
            }

            return Request.CreateResponse(HttpStatusCode.OK, customer);
        }

        protected override void Dispose(bool disposing)
        {
            db.Dispose();
            base.Dispose(disposing);
        }
    }
}

ModelDbContext.cs

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Data.Metadata.Edm;
using System.Linq;
using System.Web;

namespace WebApiTest.Models.DAL
{
    public class ModelDbContext : DbContext
    {
        public DbSet<Customer> Customers { get; set; }
        public DbSet<Order> Orders { get; set; }

        public ModelDbContext() : base()
        {
            // Just to get some data in there...

            var c = new Customer() { Id = 1, Name = "Customer 1", Orders = new List<Order>() };

            this.Customers.Add(c);

            c.Orders.Add(new Order() { Id = 1, CustomerId = 1, Description = "Drugs" });

            this.SaveChanges();
        }
    }
}

Order.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace WebApiTest.Models
{
    public class Order
    {
        public int Id { get; set; }
        public int CustomerId { get; set; }
        public string Description { get; set; }
    }
}