如何从其他服务方法调用 WCF 服务？

Question

我的应用程序中有代码：

[ServiceContract(Namespace = "")]
public class Service1
{
    [OperationContract]
    public object SomeMethod1(){}
}

[ServiceContract(Namespace = "")]
public class Service2
{
    [OperationContract]
    public object SomeMethod2()
    {
        var result = new Service1().SomeMethod1();
    }
}

我必须使用一些代理来调用 service1 方法还是正确的方法？

Answer 1

我们不能这样做。 在WCF中，每个ServiceContract对应一个endpoint，调用不同的endpoint需要不同的代理，因为这些endpoint的地址信息不一样。

这是一个演示：

 [ServiceContract]
    public interface ICalculator
    {
        [OperationContract]
        double Add(double n1, double n2);
    }
    [ServiceContract]
    public interface ICalculator2
    {
        [OperationContract]
        double Subtract(double n1, double n2);
    }
    public class CalculatorService : ICalculator,ICalculator2
    {
        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;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            // Step 1: Create a URI to serve as the base address.
            Uri baseAddress = new Uri("http://localhost:8000/GettingStarted/");

            // Step 2: Create a ServiceHost instance.
            ServiceHost selfHost = new ServiceHost(typeof(CalculatorService), baseAddress);

            try
            {
                // Step 3: Add a service endpoint.
                selfHost.AddServiceEndpoint(typeof(ICalculator), new BasicHttpBinding(), "CalculatorService");
                selfHost.AddServiceEndpoint(typeof(ICalculator2), new BasicHttpBinding(), "CalculatorService2");
                // Step 4: Enable metadata exchange.
                ServiceMetadataBehavior smb = new ServiceMetadataBehavior();
                smb.HttpGetEnabled = true;
                selfHost.Description.Behaviors.Add(smb);

                // Step 5: Start the service.
                selfHost.Open();
                Console.WriteLine("The service is ready.");

                // Close the ServiceHost to stop the service.
                Console.WriteLine("Press <Enter> to terminate the service.");
                Console.WriteLine();
                Console.ReadLine();
                selfHost.Close();
            }
            catch (CommunicationException ce)
            {
                Console.WriteLine("An exception occurred: {0}", ce.Message);
                selfHost.Abort();
            }
        }
    }

上述服务中有两个ServiceContract，一个是ICalculator，一个是ICalculator2。 它们的端点地址不相同。

当我们添加服务引用时，会生成两个代理类，两个代理类的端点地址不同：

所以我们不能使用同一个代理class来调用不同的ServiceContracts。