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Simple WCF Application

Posted By:Rajshree       Posted Date: October 05, 2010    Points: 50    Category: WCF    URL: http://www.dotnetspark.com  

WCF Application with Service contract discussion

Service contract describes the operation that service provide. A Service can have more than one service contract but it should have at least one Service contract.

Service Contract can be define using [ServiceContract] and [OperationContract] attribute. [ServiceContract] attribute is similar to the [WebServcie] attribute in the WebService and [OpeartionContract] is similar to the [WebMethod] in WebService.

  • It describes the client-callable operations (functions) exposed by the service
  • It maps the interface and methods of your service to a platform-independent description
  • It describes message exchange patterns that the service can have with another party. Some service operations might be one-way; others might require a request-reply pattern
  • It is analogous to the element in WSDL

To create a service contract you define an interface with related methods representative of a collection of service operations, and then decorate the interface with the ServiceContract Attribute to indicate it is a service contract. Methods in the interface that should be included in the service contract are decorated with the OperationContract Attribute.

public interface IService
     int Add(int num1, int num2);


using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;

// NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "Service" in code, svc and config file together.
public class Service : IService
    public int Add(int num1, int num2)
        return num1 + num2;


 protected void Button1_Click(object sender, EventArgs e)
        Service srv = new Service();
        int a = srv.Add(12, 13);
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