Creating a Simple Rest Service

Create a LIB Base Class Model

1) Add a new project --> select a console application-->name it as "NorthWindLibrary"

2) add a class Product.cs  and write code as


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.Runtime.Serialization;
using System.Data.Linq.Mapping;

namespace NWLib
{
    [Table(Name="Products")]
    public class Product
    {
        [Column(Name="ProductId" ,IsPrimaryKey=true)]
        public int Id { get; set; }
        [Column]
        public string productName { get; set; }
        [Column]
        public decimal UnitPrice { get; set; }

    }

    [CollectionDataContract]
    public class Products : List<Product>
    {
        /// <summary>
        /// Contructure to get list of product
        /// </summary>
        public Products() { }

        /// <summary>
        /// Contructure to get list of product with parameter
        /// </summary>
        public Products(List<Product> pList):base(pList) { }

    }
}

3) Add New Interface and write code as

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceModel;
using System.ServiceModel.Web;
namespace NWLib
{
    [ServiceContract]
    public interface IProductService
    {
        [WebGet(UriTemplate="ShowProducts")]
        [OperationContract]
        Products GetAllProduct();

        [WebGet(UriTemplate = "ShowProductsJson",ResponseFormat=WebMessageFormat.Json)]
        [OperationContract]
        Products GetAllProductjson();


       [WebGet(UriTemplate = "SingleProduct/{pid}")]
        [OperationContract]
        Product GetProduct(string pid);
    }
}

4)Add class ProductSvc and write code as

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.Data.Linq;

namespace NWLib
{
    public class ProductSvc : IProductService
    {
        DataContext context = new DataContext("Data Source=.;Initial Catalog=Northwind;Integrated Security=true");

        public Products GetAllProduct()
        {
            var result = from p in context.GetTable<Product>()
                         select p;
            return new Products(result.ToList());
        }

        public Products GetAllProductjson()
        {
            var result = from p in context.GetTable<Product>()
                         select p;
            return new Products(result.ToList());
        }


       public Product GetProduct(string pid)
        {
               var result = (from p in context.GetTable<Product>()
                         where p.Id == Convert.ToInt32(pid)
                         select p).FirstOrDefault();
            return result as Product;
        }

    }
}

3)  build and run

Create a Host Application

1) Add a new project --> select a console application-->name it as "HostApp"

2) in Program.cs write code as

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.ServiceModel;
using System.ServiceModel.Web;
using NWLib;

namespace HostApp
{
    class Program
    {
        static void Main(string[] args)
        {
            WebServiceHost host = new WebServiceHost(typeof(ProductSvc));
            host.Open();
            Console.WriteLine("Service started.");
            Console.ReadLine();
            host.Close();
        }
    }
}

3)Add App.Config and Do the Configuration by GUI or write code as follows in app.config

<?xml version="1.0"?>
<configuration>
<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup><system.serviceModel>
        <behaviors>
            <endpointBehaviors>
                <behavior name="ProductBehavior">
                    <webHttp helpEnabled="true" />
                </behavior>
            </endpointBehaviors>
            <serviceBehaviors>
                <behavior name="NWBehaviour">
                    <serviceMetadata httpGetEnabled="true" />
                </behavior>
            </serviceBehaviors>
        </behaviors>
        <services>
            <service behaviorConfiguration="NWBehaviour" name="NWLib.ProductSvc">
                <endpoint address="http://localhost:9560/PS" behaviorConfiguration="ProductBehavior"
                    binding="webHttpBinding" bindingConfiguration="" contract="NWLib.IProductService" />
            </service>
        </services>
    </system.serviceModel>
</configuration>

4) build and  Run



Create a Client Application



1) Add a new project --> select a console application-->name it as "ClientApp"

2) In Program.cs write code as

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.Net;
using System.IO;

namespace ClientApp
{
    class Program
    {
        static void Main(string[] args)
        {
            UsingWebRequest();
        }

        private static void UsingWebRequest()
        {
          ///To Get all list of Products in Default XMl format
            //string url = "http://localhost:9560/PS/ShowProducts";

            ///To Get all list of Products in  Json format
            //string url = "http://localhost:9560/PS/ShowProductsJson";

            ///To Get a single product when we pass a productid=2
            string url = "http://localhost:9560/PS/SingleProduct/2";

            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);

            HttpWebResponse response = request.GetResponse() as HttpWebResponse;

            StreamReader reader = new StreamReader(response.GetResponseStream());

            string data = reader.ReadToEnd();
            Console.WriteLine(data);
            Console.ReadLine();
        }
    }
}

3)Build and Run