WCF学习笔记（二）：简单调用

 

一个通信会话过程有两个部分组成，客户端和服务端，他们要进行会话就必然有共同的语言约定，在WCF中这称为契约(contract)，定义好通信的约定后，服务端需要确定服务的具体内容，即为配置、运行服务、开放终结点。客户端描述如何从 WCF 服务检索用于创建 WCF 客户端的元数据。

第一、建立契约 

代码

using  System;
using  System.ServiceModel;
 
namespace  Microsoft.ServiceModel.Samples
{
  ServiceContract(Namespace  =  “http: // wengyuli”)] 
   public   interface  ICalculator
  {
     [OperationContract]
      double  Add( double  n1,  double  n2);
   ｝
}

 

第二、实现契约

public   class  CalculatorService : ICalculator
{
     public   double  Add( double  n1,  double  n2)
   {
       double  result  =  n1  +  n2;
       return  result;
    }
}

 

第三、发布服务 

代码

static   void  Main( string [] args)

        {

            Uri baseAddress  =   new  Uri( " http://localhost:8000/wengyuli/Service " );

            ServiceHost serviceHost  =   new  ServiceHost( typeof (CalculatorService), baseAddress);

             try

            {

                serviceHost.AddServiceEndpoint( typeof (ICalculator),  new  WSHttpBinding(),  " CalculatorService " );

                ServiceMetadataBehavior smb  =   new  ServiceMetadataBehavior();

                smb.HttpGetEnabled  =   true ;

                serviceHost.Description.Behaviors.Add(smb);

                serviceHost.Open();

                Console.WriteLine( " The service is ready. " );

                Console.WriteLine( " Press <ENTER> to terminate service. " );

                Console.WriteLine();

                Console.ReadLine();

                serviceHost.Close();

            }

             catch  (CommunicationException ce)

            {

                Console.WriteLine( " An exception occured: {0} " , ce.Message);

                serviceHost.Abort();

            }

        }

 

第四、调用服务

代码

static   void  Main( string [] args)

        {

             // Create an instance of the WCF Client.

            System.ServiceModel.EndpointAddress epAddress  =   new  EndpointAddress( " http://localhost:8000/wengyuli/Service/CalculatorService " );

            CalculatorClient client  =   new  CalculatorClient( new  WSHttpBinding(), epAddress);

             int  value1  =   2 ;

             int  value2  =   5 ;

             int  result  =  client.Add(value1, value2);

            Console.WriteLine( " Add({0},{1}) = {2} " , value1, value2, result);

            client.Close();

            Console.WriteLine();

            Console.WriteLine( " Press <ENTER> to terminate client. " );

            Console.ReadLine();

        }