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Enabling Help Page for REST Service in WCF 4.0

By Dhananjay Kumar on June 07, 2010
In this article, I will show you How to create a REST based service, How to host a REST based service in Console application, and How to enable Help page for REST Service.
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Objective

In this article, I will show you

  1. How to create a REST based service?
  2. How to host a REST based service in Console application?
  3. How to enable Help page for REST Service?
Follow the steps as below,

Step1

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Create a New project. Select Console application as project type.

Step 2

Add a new project to same solution. Choose the project type as class library.

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Step 3

Add below references in both projects console and service library

System.ServiceModel;
System.ServiceModel.Description;
System.ServiceModel.Web;

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If you are not able to get System.ServiceModel.Webdll by default , when you are adding as Add Reference in your console application project and class library project , then follow the below steps
  1. Right click on your console application project or class library project
  2. Select properties from context menu
  3. From Application tab, if you see by default .NET Framework 4 Client profile is selected. Change that to .NET Framework 4.0. So your target framework should be .NET Framework 4.0.

    image4.gif
Now you should able to see all the dll when you add service reference in project.

Step 4

In this step, I will create contract of service
  1. Open the Contract (Class Library project).
  2. Delete Class1.
  3. Right click and add a new item then select Interface from Code tab.

    image5.gif
     
  4. Make Interface as public and put ServiceContractattribute.
  5. Declare two operation contracts. Make one attributed with WebGet and another attributed with Web Invoke.

IService.cs

using System;
usingSystem.Collections.Generic;
usingSystem.Linq;
usingSystem.Text;
usingSystem.ServiceModel;
usingSystem.ServiceModel.Web;

namespace Contracts
{
    [ServiceContract]
publicinterfaceIService
    {
        [OperationContract]
        [WebGet]
stringGetMessage(stringinputMessage);

        [OperationContract]
        [WebInvoke]
stringPostMessage(stringinputMessage);
    }
}


Step 5

In this step, I will implement the contract in Service file. To do so,

  1. Right click and add a class in Console application.

    image6.gif
     
  2. Give any name; I am giving name here Service of the class.
  3. Implement the interface (Contract IService) in this class.
Service.cs

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

namespaceSelfHostedRESTService
{
publicclassService :IService
    {      

publicstringGetMessage(stringinputMessage)
        {
return"Calling Get for you " + inputMessage;
        }

publicstringPostMessage(stringinputMessage)
     {
return"Calling Post for you " + inputMessage;
     }
    }
}


Step 6

In this step, I will host the service in a console application. So to do so

  1. Open Program.cs
  2. Create instanced ofWebServieceHostFactory

    image7.gif
     
  3. Add a service end point

    image8.gif
     
  4. Add service host behavior with help page enabled

    image9.gif
As we know, REST service used webHttpBindding. And we are enabling Help page here.

Program.cs

using System;
usingSystem.Collections.Generic;
usingSystem.Linq;
usingSystem.Text;
usingSystem.ServiceModel;
usingSystem.ServiceModel.Description;
usingSystem.ServiceModel.Web;
using Contracts;

namespaceSelfHostedRESTService
{
classProgram
    {
staticvoid Main(string[] args)
        {

WebServiceHost host = newWebServiceHost(typeof(Service), newUri("http://localhost:8000"));
ServiceEndpointep = host.AddServiceEndpoint(typeof(IService), newWebHttpBinding(), "");

host.Description.Endpoints[0].Behaviors.Add(newWebHttpBehavior { HelpEnabled = true });          
host.Open();
Console.WriteLine("Service is up and running");
Console.WriteLine("Press enter to quit ");
Console.ReadLine();
host.Close();

        }
    }
}


Step 7

Just press F5 to run the service.

image10.gif

Now once service is up and running, I can test,

To test the Help page, just type
http://localhost:8000/help

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When you click on Get or Post link you will get below detail help.

image12.gif

I hope this post was useful. Thanks for reading. Happy coding .
 

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