Практическое руководство. Доступ к службам WCF с односторонним контрактом и контрактом типа "запрос-ответ"

В следующих процедурах описывается, как получить доступ к службе Windows Communication Foundation (WCF), которая определяет односторонний контракт и контракт ответа на запрос и не использует дуплексный шаблон связи.

Определение службы

  1. Объявите контракт службы. Для операций, которые требуется сделать односторонними, необходимо назначить для IsOneWay значение true в атрибуте OperationContractAttribute. В следующем коде объявляется контракт IOneWayCalculator, имеющий односторонние операции для Add, Subtract, Multiply и Divide. В нем также определяется операция ответа на запрос, называемая SayHello.

    [ServiceContract(Namespace = "http://Microsoft.ServiceModel.Samples")]  
    public interface IOneWayCalculator  
    {  
        [OperationContract(IsOneWay = true)]  
        void Add(double n1, double n2);  
        [OperationContract(IsOneWay = true)]  
        void Subtract(double n1, double n2);  
        [OperationContract(IsOneWay = true)]  
        void Multiply(double n1, double n2);  
        [OperationContract(IsOneWay = true)]  
        void Divide(double n1, double n2);  
        [OperationContract]  
        string SayHello(string name);  
    }  
    
  2. Реализуйте контракт службы. В следующем коде реализуется интерфейс IOnewayCalculator.

    [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple, InstanceContextMode = InstanceContextMode.PerCall)]  
    public class CalculatorService : IOneWayCalculator  
    {  
        public void Add(double n1, double n2)  
        {  
           double result = n1 + n2;  
           Console.WriteLine("Add({0},{1}) = {2} ", n1, n2, result);  
        }  
    
        public void Subtract(double n1, double n2)  
        {  
           double result = n1 - n2;  
           Console.WriteLine("Subtract({0},{1}) = {2}", n1, n2, result);  
        }  
    
        public void Multiply(double n1, double n2)  
        {  
            double result = n1 * n2;  
            Console.WriteLine("Multiply({0},{1}) = {2}", n1, n2, result);  
        }  
    
        public void Divide(double n1, double n2)  
        {  
            double result = n1 / n2;  
            Console.WriteLine("Divide({0},{1}) = {2}", n1, n2, result);  
        }  
    
        public string SayHello(string name)  
        {  
            Console.WriteLine("SayHello({0})", name);  
            return "Hello " + name;  
        }  
    }  
    
  3. Разместите службу в консольном приложении. В следующем примере кода показано, как это сделать.

    // Host the service within this EXE console application.  
    public static void Main()  
    {  
       // Define the base address for the service.  
       Uri baseAddress = new Uri("http://localhost:8000/servicemodelsamples/service");  
    
       // Create a ServiceHost for the CalculatorService type and provide the base address.  
       using (ServiceHost serviceHost = new ServiceHost(typeof(CalculatorService), baseAddress))  
       {  
            // Add an endpoint using the IOneWayCalculator contract and the WSHttpBinding  
            serviceHost.AddServiceEndpoint(typeof(IOneWayCalculator), new WSHttpBinding(), "");  
    
          // Turn on the metadata behavior, this allows svcutil to get metadata for the service.  
          ServiceMetadataBehavior smb = (ServiceMetadataBehavior) serviceHost.Description.Behaviors.Find<ServiceMetadataBehavior>();  
          if (smb == null)  
          {  
                smb = new ServiceMetadataBehavior();  
                smb.HttpGetEnabled = true;  
                serviceHost.Description.Behaviors.Add(smb);  
          }  
    
          // Open the ServiceHostBase to create listeners and start listening for messages.  
          serviceHost.Open();  
    
          // The service can now be accessed.  
          Console.WriteLine("The service is ready.");  
          Console.WriteLine("Press <ENTER> to terminate service.");  
          Console.WriteLine();  
          Console.ReadLine();  
        }  
    }  
    

Доступ к службе

  1. Запустите средство служебной программы метаданных ServiceModel (Svcutil.exe) с помощью адреса конечной точки обмена метаданными для создания клиентского класса для службы с помощью следующей командной строки: Svcutil http://localhost:8000/Serviceсредство служебной программы метаданных ServiceModel (Svcutil.exe) создает набор интерфейсов и классов, как показано в следующем примере кода.

    [System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "3.0.0.0")]  
    [System.ServiceModel.ServiceContractAttribute(Namespace="http://Microsoft.ServiceModel.Samples", ConfigurationName="IOneWayCalculator")]  
    public interface IOneWayCalculator  
    {  
    
        [System.ServiceModel.OperationContractAttribute(IsOneWay=true, Action="http://Microsoft.ServiceModel.Samples/IOneWayCalculator/Add")]  
        void Add(double n1, double n2);  
    
        [System.ServiceModel.OperationContractAttribute(IsOneWay=true, Action="http://Microsoft.ServiceModel.Samples/IOneWayCalculator/Subtract")]  
        void Subtract(double n1, double n2);  
    
        [System.ServiceModel.OperationContractAttribute(IsOneWay=true, Action="http://Microsoft.ServiceModel.Samples/IOneWayCalculator/Multiply")]  
        void Multiply(double n1, double n2);  
    
        [System.ServiceModel.OperationContractAttribute(IsOneWay=true, Action="http://Microsoft.ServiceModel.Samples/IOneWayCalculator/Divide")]  
        void Divide(double n1, double n2);  
    
        [System.ServiceModel.OperationContractAttribute(Action="http://Microsoft.ServiceModel.Samples/IOneWayCalculator/SayHello", ReplyAction="http://Microsoft.ServiceModel.Samples/IOneWayCalculator/SayHelloResponse")]  
        string SayHello(string name);  
    }  
    
    [System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "3.0.0.0")]  
    public interface IOneWayCalculatorChannel : IOneWayCalculator, System.ServiceModel.IClientChannel  
    {  
    }  
    
    [System.Diagnostics.DebuggerStepThroughAttribute()]  
    [System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "3.0.0.0")]  
    public partial class OneWayCalculatorClient : System.ServiceModel.ClientBase<IOneWayCalculator>, IOneWayCalculator  
    {  
    
        public OneWayCalculatorClient()  
        {  
        }  
    
        public OneWayCalculatorClient(string endpointConfigurationName) :
                base(endpointConfigurationName)  
        {  
        }  
    
        public OneWayCalculatorClient(string endpointConfigurationName, string remoteAddress) :
                base(endpointConfigurationName, remoteAddress)  
        {  
        }  
    
        public OneWayCalculatorClient(string endpointConfigurationName, System.ServiceModel.EndpointAddress remoteAddress) :
                base(endpointConfigurationName, remoteAddress)  
        {  
        }  
    
        public OneWayCalculatorClient(System.ServiceModel.Channels.Binding binding, System.ServiceModel.EndpointAddress remoteAddress) :
                base(binding, remoteAddress)  
        {  
        }  
    
        public void Add(double n1, double n2)  
        {  
            base.Channel.Add(n1, n2);  
        }  
    
        public void Subtract(double n1, double n2)  
        {  
            base.Channel.Subtract(n1, n2);  
        }  
    
        public void Multiply(double n1, double n2)  
        {  
            base.Channel.Multiply(n1, n2);  
        }  
    
        public void Divide(double n1, double n2)  
        {  
            base.Channel.Divide(n1, n2);  
        }  
    
        public string SayHello(string name)  
        {  
            return base.Channel.SayHello(name);  
        }  
    }  
    

    Обратите внимание, что в интерфейсе IOneWayCalculator односторонним операциям службы задано значение IsOneWay для атрибута true, а операции запроса-ответа службы для этого атрибута задано значение по умолчанию: false. Также обратите внимание на класс OneWayCalculatorClient. Он используется для вызова службы.

  2. Создайте клиентский объект.

    // Create a client  
    WSHttpBinding binding = new WSHttpBinding();  
    EndpointAddress epAddress = new EndpointAddress("http://localhost:8000/servicemodelsamples/service");  
    OneWayCalculatorClient client = new OneWayCalculatorClient(binding, epAddress);  
    
  3. Вызовите операции службы.

    // Call the Add service operation.  
    double value1 = 100.00D;  
    double value2 = 15.99D;  
    client.Add(value1, value2);  
    Console.WriteLine("Add({0},{1})", value1, value2);  
    
    // Call the Subtract service operation.  
    value1 = 145.00D;  
    value2 = 76.54D;  
    client.Subtract(value1, value2);  
    Console.WriteLine("Subtract({0},{1})", value1, value2);  
    
    // Call the Multiply service operation.  
    value1 = 9.00D;  
    value2 = 81.25D;  
    client.Multiply(value1, value2);  
    Console.WriteLine("Multiply({0},{1})", value1, value2);  
    
    // Call the Divide service operation.  
    value1 = 22.00D;  
    value2 = 7.00D;  
    client.Divide(value1, value2);  
    Console.WriteLine("Divide({0},{1})", value1, value2);  
    
    // Call the SayHello service operation  
    string name = "World";  
    string response = client.SayHello(name);  
    Console.WriteLine("SayHello([0])", name);  
    Console.WriteLine("SayHello() returned: " + response);  
    
  4. Закройте клиент, чтобы закрыть соединения и очистить ресурсы.

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

Пример

Код, фрагменты которого представлены в данном разделе, полностью приведен ниже.

// Service.cs  
using System;  
using System.Configuration;  
using System.ServiceModel;  
using System.ServiceModel.Description;  
  
namespace Microsoft.ServiceModel.Samples  
{  
    // Define a service contract.
    [ServiceContract(Namespace = "http://Microsoft.ServiceModel.Samples")]  
    public interface IOneWayCalculator  
    {  
        [OperationContract(IsOneWay = true)]  
        void Add(double n1, double n2);  
        [OperationContract(IsOneWay = true)]  
        void Subtract(double n1, double n2);  
        [OperationContract(IsOneWay = true)]  
        void Multiply(double n1, double n2);  
        [OperationContract(IsOneWay = true)]  
        void Divide(double n1, double n2);  
        [OperationContract]  
        string SayHello(string name);  
    }  
  
    // Service class which implements the service contract.  
    // Added code to write output to the console window  
    [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple, InstanceContextMode = InstanceContextMode.PerCall)]  
    public class CalculatorService : IOneWayCalculator  
    {  
        public void Add(double n1, double n2)  
        {  
            double result = n1 + n2;  
            Console.WriteLine("Add({0},{1}) = {2} ", n1, n2, result);  
        }  
  
        public void Subtract(double n1, double n2)  
        {  
            double result = n1 - n2;  
            Console.WriteLine("Subtract({0},{1}) = {2}", n1, n2, result);  
        }  
  
        public void Multiply(double n1, double n2)  
        {  
            double result = n1 * n2;  
            Console.WriteLine("Multiply({0},{1}) = {2}", n1, n2, result);  
        }  
  
        public void Divide(double n1, double n2)  
        {  
            double result = n1 / n2;  
            Console.WriteLine("Divide({0},{1}) = {2}", n1, n2, result);  
        }  
  
        public string SayHello(string name)  
        {  
            Console.WriteLine("SayHello({0})", name);  
            return "Hello " + name;  
        }  
  
        // Host the service within this EXE console application.  
        public static void Main()  
        {  
            // Define the base address for the service.  
            Uri baseAddress = new Uri("http://localhost:8000/servicemodelsamples/service");  
  
            // Create a ServiceHost for the CalculatorService type and provide the base address.  
            using (ServiceHost serviceHost = new ServiceHost(typeof(CalculatorService), baseAddress))  
            {  
                // Add an endpoint using the IOneWayCalculator contract and the WSHttpBinding  
                serviceHost.AddServiceEndpoint(typeof(IOneWayCalculator), new WSHttpBinding(), "");  
  
                // Turn on the metadata behavior, this allows svcutil to get metadata for the service.  
                ServiceMetadataBehavior smb = (ServiceMetadataBehavior) serviceHost.Description.Behaviors.Find<ServiceMetadataBehavior>();  
                if (smb == null)  
                {  
                    smb = new ServiceMetadataBehavior();  
                    smb.HttpGetEnabled = true;  
                    serviceHost.Description.Behaviors.Add(smb);  
                }  
  
                // Open the ServiceHostBase to create listeners and start listening for messages.  
                serviceHost.Open();  
  
                // The service can now be accessed.  
                Console.WriteLine("The service is ready.");  
                Console.WriteLine("Press <ENTER> to terminate service.");  
                Console.WriteLine();  
                Console.ReadLine();  
            }  
        }  
    }  
}
// client.cs  
using System;  
using System.ServiceModel;  
  
namespace Microsoft.ServiceModel.Samples  
{  
    //The service contract is defined in generatedClient.cs, generated from the service by the svcutil tool.  
  
    //Client implementation code.  
    class Client  
    {  
        static void Main()  
        {  
            // Create a client  
            WSHttpBinding binding = new WSHttpBinding();  
            EndpointAddress epAddress = new EndpointAddress("http://localhost:8000/servicemodelsamples/service");  
            OneWayCalculatorClient client = new OneWayCalculatorClient(binding, epAddress);  
  
            // Call the Add service operation.  
            double value1 = 100.00D;  
            double value2 = 15.99D;  
            client.Add(value1, value2);  
            Console.WriteLine("Add({0},{1})", value1, value2);  
  
            // Call the Subtract service operation.  
            value1 = 145.00D;  
            value2 = 76.54D;  
            client.Subtract(value1, value2);  
            Console.WriteLine("Subtract({0},{1})", value1, value2);  
  
            // Call the Multiply service operation.  
            value1 = 9.00D;  
            value2 = 81.25D;  
            client.Multiply(value1, value2);  
            Console.WriteLine("Multiply({0},{1})", value1, value2);  
  
            // Call the Divide service operation.  
            value1 = 22.00D;  
            value2 = 7.00D;  
            client.Divide(value1, value2);  
            Console.WriteLine("Divide({0},{1})", value1, value2);  
  
            // Call the SayHello service operation  
            string name = "World";  
            string response = client.SayHello(name);  
            Console.WriteLine("SayHello([0])", name);  
            Console.WriteLine("SayHello() returned: " + response);  
            //Closing the client gracefully closes the connection and cleans up resources  
            client.Close();  
  
        }  
    }  
}  

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