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How to create a JSON WCF RESTful Service in 60 seconds

, 10 Mar 2011 CPOL 241.7K 7.2K 60
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How to expose JSON data over a RESTful interface.

WCF makes it very easy to expose JSON data over a RESTful interface, as long as you are aware of a couple of “gotchas” in advance.

This article will explain those to you, so you can focus on your business logic rather than configuration of your WCF services.

We start this example by creating a WCF Service Library project:

new-project

Next we need to add a reference to the System.ServiceModel.Web framework.  Right click on your project file and select Add Reference…

add-reference

As this framework is not part of the .Net Framework 4 Client Profile, Visual Studio kindly informs us that it will update our target Framework to the full version of .Net Framework 4.  Click Yes to accept this change:

target-change

We are now ready to update our code.

Copy and paste the following code into the App.Config file:

<?xml version="1.0"?>
<configuration>
  <system.serviceModel>
	<services>
	  <service name="WcfJsonRestService.Service1">
		<endpoint address="http://localhost:8732/service1" 
				  binding="webHttpBinding" 
				  contract="WcfJsonRestService.IService1"/>
	  </service>
	</services>
	<behaviors>
	  <endpointBehaviors>
		<behavior>
		  <webHttp />
		</behavior>
	  </endpointBehaviors>
	</behaviors>
  </system.serviceModel>
  <startup>
	<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
  </startup>
</configuration>

Notice the binding is set to webHttpBinding as opposed to the normal project template default of wsHttpBinding. 

The other important change is the addition of an endpointBehavior for WebHttp.

These two changes are required to enable JSON over REST for WCF.

Copy and paste the following code into the IService1 file:

using System.ServiceModel;

namespace WcfJsonRestService
{
    [ServiceContract]
    public interface IService1
    {
        [OperationContract]
        Person GetData(string id);
    }
}

Notice we are accepting an “In” parameter for id of datatype string.  For this example we are returning a custom type of Person.

Copy and paste the following code into the Service1.cs file:

using System;
using System.ServiceModel.Web;

namespace WcfJsonRestService
{
    public class Service1 : IService1
    {
        [WebInvoke(Method = "GET", 
                    ResponseFormat = WebMessageFormat.Json, 
                    UriTemplate = "data/{id}")]
        public Person GetData(string id)
        {
            // lookup person with the requested id 
            return new Person()
                       {
                           Id = Convert.ToInt32(id), 
                           Name = "Leo Messi"
                       };
        }
    }

    public class Person
    {
        public int Id { get; set; }
        public string Name { get; set; }
    }
}

The key elements here are the attributes applied to the method.  We are enabling the method to be called over HTTP GET, returning the data in Json format and setting the Uri template to ensure we are using a RESTful interface.

To test your brand new service we will pass in the id value of 10 simply by opening your favourite browser and pasting in the following URL: 

http://localhost:8732/Service1/data/10

json-browser

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

StevenHollidge
Software Developer (Senior)
United Kingdom United Kingdom
Developer of .Net Enterprise solutions in the City of London
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Comments and Discussions

 
GeneralMy vote of 5 Pin
aishar19-May-12 22:41
memberaishar19-May-12 22:41 
GeneralMy vote of 5 Pin
Rob Philpott17-Apr-12 2:16
memberRob Philpott17-Apr-12 2:16 
GeneralMy vote of 1 Pin
Member 313671823-Feb-12 19:48
memberMember 313671823-Feb-12 19:48 
QuestionCould not get this demo to work outside the debugger Pin
Member 848605113-Dec-11 11:13
memberMember 848605113-Dec-11 11:13 
AnswerRe: Could not get this demo to work outside the debugger Pin
GeertSchneider19-Jan-12 0:42
memberGeertSchneider19-Jan-12 0:42 
QuestionWCF service host cannot find any service metadata Pin
Peter Sedman15-Nov-11 3:49
memberPeter Sedman15-Nov-11 3:49 
AnswerRe: WCF service host cannot find any service metadata Pin
Member 1006555420-May-13 9:12
memberMember 1006555420-May-13 9:12 
QuestionHow do I find my port number Pin
MikeClarke3-Nov-11 13:05
memberMikeClarke3-Nov-11 13:05 
You didn’t finish the tutorial from all the other responses they all have the same problem. I published it which created to .svc and tried to access it that way but it just gives errors???
Questionservice1 has multiple contracts Pin
geordiej30-Jun-11 4:31
membergeordiej30-Jun-11 4:31 
GeneralNot working for me Pin
mrchief_200010-May-11 12:21
membermrchief_200010-May-11 12:21 
GeneralThis is not working for me Pin
Member 776037623-Mar-11 5:58
memberMember 776037623-Mar-11 5:58 
JokeObvious Problem In The Sample Pin
markgmarkg12-Mar-11 7:52
membermarkgmarkg12-Mar-11 7:52 
GeneralRe: Obvious Problem In The Sample Pin
StevenHollidge13-Mar-11 0:10
memberStevenHollidge13-Mar-11 0:10 
GeneralMy vote of 3 Pin
maq_rohit10-Mar-11 5:59
membermaq_rohit10-Mar-11 5:59 
GeneralRe: My vote of 3 Pin
nano2k15-May-12 5:05
membernano2k15-May-12 5:05 

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