Comment : accéder aux services WCF avec des contrats unidirectionnels et demande-réponse

Article
06/08/2023

Les procédures suivantes décrivent comment accéder à un service Windows Communication Foundation (WCF) qui définit un contrat unidirectionnel et un contrat réponse-demande et qui n’utilise pas le modèle de communication duplex.

Pour définir le service

Déclarez le contrat de service. Pour les opérations qui doivent être unidirectionnelles, IsOneWay doit avoir la valeur true dans OperationContractAttribute. Le code suivant déclare le contrat IOneWayCalculator qui comprend des opérations unidirectionnelles pour Add, Subtract, Multiply et Divide. Il définit également une opération de réponse-demande appelée 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);  
}

Implémentez le contrat de service. Le code suivant implémente l'interface 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;  
    }  
}

Hébergez le service dans une application console. Le code suivant indique comment héberger le service.

// 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();  
    }  
}

Pour accéder au service

Exécutez l’outil Service Model Metadata Tool (Svcutil.exe) à l’aide de l’adresse du point de terminaison de l’échange de métadonnées pour créer la classe de client pour le service à l’aide de la ligne de commande suivante : Svcutil http://localhost:8000/Service L’outil Service Model Metadata Tool (Svcutil.exe) génère un ensemble d’interfaces et de classes, comme illustré dans l’exemple de code suivant.

[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);  
    }  
}

Observez dans l'interface IOneWayCalculator que l'attribut IsOneWay des opérations de service unidirectionnelles a la valeur true tandis que l'attribut de l'opération de service de réponse-demande a la valeur par défaut false. Observez également la classe OneWayCalculatorClient. C'est la classe que vous utiliserez pour appeler le service.

Créez l'objet client.

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

Appelez les opérations de service.

// 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);

Fermez le client pour fermer les connexions et nettoyer les ressources.

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

Exemple

L’intégralité du code utilisé dans cette rubrique est présentée ci-dessous.

// 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();  
  
        }  
    }  
}

Voir aussi

Services monodirectionnels

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Comment : accéder aux services WCF avec des contrats unidirectionnels et demande-réponse

Pour définir le service

Pour accéder au service

Exemple

Voir aussi

Ressources supplémentaires