Multiple Service Contracts in WCF Service

Objective

In this article, I will show you, how we can have multiple contracts in WCF service.

Block Diagram

clip_image002

Above block diagram says

1. There are three contracts.

2. All contracts are being implemented in same service class.

3. Each contract is exposed on different end points.

To start with follow the below steps,

Step 1

Create a WCF Service Application.

Step 2

Already by default IService1 contract is being added. Add two more contracts. Right click on the project and select add new item and then choose Interface from Code tab.

For my purpose, I am adding two more contracts called IMyContract1 and IMyContract2. So now there are three service contracts in my service. They are

1. IService1

2. IMyContract1

3. IMyContract2

IMyContract1

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.ServiceModel;

namespace MultipleEndpoints

{

[ServiceContract]

public interface IMyContract1

{

[OperationContract ]

string GetMessagefromIMyContract1();

}

}

IService1

using System;

using System.Collections.Generic;

using System.Linq;

using System.Runtime.Serialization;

using System.ServiceModel;

using System.ServiceModel.Web;

using System.Text;

namespace MultipleEndpoints

{

[ServiceContract]

public interface IService1

{

[OperationContract]

string GetMessagefromIService1();

}

}

IMyContract2

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.ServiceModel;

namespace MultipleEndpoints

{

[ServiceContract]

public interface IMyContract2

{

[OperationContract]

string GetMessagefromIMyContract2();

}

}

Step 3

Implement the contracts in same service class Service1.svc. All the function is just returning a simple string.

Service1.svc.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Runtime.Serialization;

using System.ServiceModel;

using System.ServiceModel.Web;

using System.Text;

namespace MultipleEndpoints

{

public class Service1 : IService1, IMyContract1, IMyContract2

{

public string GetMessagefromIService1()

{

return “Calling Default Contract IService1″;

}

public string GetMessagefromIMyContract1()

{

return “Calling My Contract IMyContract1″;

}

public string GetMessagefromIMyContract2()

{

return “Calling My Contract IMyContract2″;

}

}

}


Step4

Now we need to configure the end points for the different contracts. Just modify System.ServiceModel node in configuration file (Web.Config) as below

clip_image003

If you see the above end points configuration, different contracts has been exposed on different endpoints. Address of the end points is given as relative to base address. And each end point contains a unique name also. Address is unique for each end point.

Web.Config

<?xml version=1.0?>

<configuration>

<system.web>

<compilation debug=true targetFramework=4.0 />

</system.web>

<system.serviceModel>

<behaviors>

<serviceBehaviors>

<behavior name =Mg>

<serviceMetadata httpGetEnabled=true/>

<serviceDebug includeExceptionDetailInFaults=false/>

</behavior>

</serviceBehaviors>

</behaviors>

<services >

<service name =MultipleEndpoints.Service1

behaviorConfiguration =Mg>

<endpoint name=firstBinding

address =/firstContract

binding =basicHttpBinding

contract =MultipleEndpoints.IService1 />

<endpoint name=secondBinding

address =/secondContract

binding =basicHttpBinding

contract =MultipleEndpoints.IMyContract1/>

<endpoint name=thirdBinding

address =/thirdContract

binding =basicHttpBinding

contract =MultipleEndpoints.IMyContract2/>

<endpoint contract=IMetadataExchange

binding=mexHttpBinding

address=mex />

<host>

<baseAddresses >

<add baseAddress =http://localhost:8180/Service1.svc/>

</baseAddresses>

</host>

</service >

</services>

</system.serviceModel>

<system.webServer>

<modules runAllManagedModulesForAllRequests=true/>

</system.webServer>

</configuration>

Step 5

Press F5 to run the service. Once service is up and running, we are ready to consume the service in client.

Step 6

Create a Console application as client. Add the service reference of the service. Now you can see, there are three proxy classes have been generated by WCF. Each class is corresponding to each service contracts exposed by the service through the end points.

clip_image004

You can see three service contracts have been exposed to the clients.

clip_image006

Above block diagram says the all that, each contract is exposed on different end points. And WCF created corresponding class for each contracts.

Program.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.ServiceModel;

using ConsoleApplication1.ServiceReference1;

namespace ConsoleApplication1

{

class Program

{

static void Main(string[] args)

{

Service1Client p = new Service1Client(“firstBinding”);

MyContract1Client q = new MyContract1Client(“secondBinding”);

MyContract2Client r = new MyContract2Client(“thirdBinding”);

Console.WriteLine(p.GetMessagefromIService1());

Console.WriteLine(q.GetMessagefromIMyContract1());

Console.WriteLine(r.GetMessagefromIMyContract2());

Console.Read();

}

}

}


When you run, you will get output as

clip_image008

Thanks for reading. I hope article was useful. Happy Coding.

4 thoughts on “Multiple Service Contracts in WCF Service

  1. really ultimate code , not only this post all your post , explanation and coding very simple and powerfull am enjoying ur post

    small comments: how you learning man :)

  2. Sir I tried this example with multiple service contracts but it is showing error. can u send me a sample project on my email id. I need it urgently. That will be a grt gesture.
    Thanks a lot.

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