WCF很简单的例子

最近看看了wcf，中文资料，英文书籍都看来。就是没有一个最简单的入门例子。还是在msdn上看到一个很简单的入门例子。
这里面就不说明其他wcf的信息了。
开发环境是vs2005 （需要安装对wcf和wpf的扩展支持）。
1建立控制台应用程序作为服务端。

///这是接口
    [ServiceContract(Namespace = "http://Microsoft.ServiceModel.Samples")]
    public interface ICalculator
    {
        [OperationContract]
        double Add(double n1, double n2);
        [OperationContract]
        double Subtract(double n1, double n2);
        [OperationContract]
        double Multiply(double n1, double n2);
        [OperationContract]
        double Divide(double n1, double n2);
    }

//实现契约和接口
 public class CalculatorService : ICalculator
    {
        public double Add(double n1, double n2)
        {
            double result = n1 + n2;
            Console.WriteLine("Received Add({0},{1})", n1, n2);
            Console.WriteLine("Return: {0}", result);
            return result;
        }

        public double Subtract(double n1, double n2)
        {
            double result = n1 - n2;
            Console.WriteLine("Received Subtract({0},{1})", n1, n2);
            Console.WriteLine("Return: {0}", result);
            return result;
        }

        public double Multiply(double n1, double n2)
        {
            double result = n1 * n2;
            Console.WriteLine("Received Multiply({0},{1})", n1, n2);
            Console.WriteLine("Return: {0}", result);
            return result;
        }

        public double Divide(double n1, double n2)
        {
            double result = n1 / n2;
            Console.WriteLine("Received Divide({0},{1})", n1, n2);
            Console.WriteLine("Return: {0}", result);
            return result;
        }
    }
//在main函数中执行
static void Main(string[] args)
        {
            Uri baseAddress = new Uri("http://localhost:8000/ServiceModelSamples/Service");
            ServiceHost serviceHost = new ServiceHost(typeof(CalculatorService), baseAddress);
            try
            {
                // Add a service endpoint
                serviceHost.AddServiceEndpoint(typeof(ICalculator), new WSHttpBinding(), "CalculatorService");
                // Enable metadata exchange
                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();

                // Close the ServiceHostBase to shutdown the service.
                serviceHost.Close();
            }
            catch (CommunicationException ce)
            {
                Console.WriteLine("An exception occured: {0}", ce.Message);
                serviceHost.Abort();
            }
           
        }
然后服务器端就ok了。运行以后。在运行状态下，把http://localhost:8000/ServiceModelSamples/Service在浏览器中运行。会看到页面信息，提示使用svcutil.exe 工具。在vs2005命令提示符中运行这个命令。就会生成两个文件，一个是cs文件一个是config文件。这个两个需要在客户端代码中使用。生成的位置在dos窗口中都有提示。我还不知道怎么更改位置。但是可以使用out参数给这两个文件改名字。
还有应该知道服务端的契约是request和reply模式。默认就是这个信息交换模式。

2客户端。
也是建立一个控制台应用程序，把前面生成的两个文件都添加到这个项目里面。config可以改名成app.config。
在客户端的main函数中实现代码：
static void Main(string[] args)
        {
            //Create an instance of the WCF Client.
            System.ServiceModel.EndpointAddress epAddress = new EndpointAddress("http://localhost:8000/ServiceModelSamples/Service/CalculatorService");
            CalculatorClient client = new CalculatorClient(new WSHttpBinding(), epAddress);

          

            // Call the Add service operation.
            double value1 = 100.00D;
            double value2 = 15.99D;
            double result = client.Add(value1, value2);
            Console.WriteLine("Add({0},{1}) = {2}", value1, value2, result);

            // Call the Subtract service operation.
            value1 = 145.00D;
            value2 = 76.54D;
            result = client.Subtract(value1, value2);
            Console.WriteLine("Subtract({0},{1}) = {2}", value1, value2, result);

            // Call the Multiply service operation.
            value1 = 9.00D;
            value2 = 81.25D;
            result = client.Multiply(value1, value2);
            Console.WriteLine("Multiply({0},{1}) = {2}", value1, value2, result);

            // Call the Divide service operation.
            value1 = 22.00D;
            value2 = 7.00D;
            result = client.Divide(value1, value2);
            Console.WriteLine("Divide({0},{1}) = {2}", value1, value2, result);

            //Closing the client gracefully closes the connection and cleans up resources
            client.Close();

            Console.WriteLine();
            Console.WriteLine("Press <ENTER> to terminate client.");
            Console.ReadLine();
        }
然后运行服务端程序。再运行客户端程序就可以看到正确的结果。

这个例子没有使用配置文件格式来写契约和节点这些东西，是通过程序方式来实现契约，地址，节点等等，他们的效果是一样的。

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