Como: Especificar uma vinculação de cliente no código

Artigo
03/05/2024

Neste exemplo, um cliente é criado para usar um serviço de calculadora e a associação para esse cliente é especificada imperativamente no código. O cliente acessa o CalculatorService, que implementa a ICalculator interface, e tanto o serviço quanto o cliente usam a BasicHttpBinding classe.

Este procedimento pressupõe que o serviço de calculadora esteja em execução. Para obter informações sobre como criar o serviço, consulte Como especificar uma associação de serviço na configuração. Ele também usa o ServiceModel Metadata Utility Tool (Svcutil.exe)Windows Communication Foundation (WCF) fornece para gerar automaticamente os componentes do cliente. A ferramenta gera o código do cliente para acessar o serviço.

O cliente é construído em duas partes. Svcutil.exe gera o ClientCalculator que implementa a ICalculator interface. Esse aplicativo cliente é então construído construindo uma instância de ClientCalculator e, em seguida, especificando a associação e o endereço para o serviço no código.

Para obter a cópia de origem deste exemplo, consulte o exemplo BasicBinding .

Para especificar uma associação personalizada no código

Use Svcutil.exe da linha de comando para gerar código a partir de metadados de serviço.
```
Svcutil.exe <service's Metadata Exchange (MEX) address or HTTP GET address>
```

O cliente gerado contém a ICalculator interface que define o contrato de serviço que a implementação do cliente deve satisfazer.

[ServiceContract]
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);
}

<ServiceContract()> _
Public Interface ICalculator

    <OperationContract()> _
    Function Add(ByVal n1 As Double, ByVal n2 As Double) As Double

    <OperationContract()> _
    Function Subtract(ByVal n1 As Double, ByVal n2 As Double) As Double

    <OperationContract()> _
    Function Multiply(ByVal n1 As Double, ByVal n2 As Double) As Double

    <OperationContract()> _
    Function Divide(ByVal n1 As Double, ByVal n2 As Double) As Double

End Interface

O cliente gerado também contém a implementação do ClientCalculator.


public class CalculatorClient : System.ServiceModel.ClientBase<Microsoft.ServiceModel.Samples.ICalculator>, Microsoft.ServiceModel.Samples.ICalculator
{

    public CalculatorClient()
    {
    }

    public CalculatorClient(string endpointConfigurationName) :
            base(endpointConfigurationName)
    {
    }

    public CalculatorClient(string endpointConfigurationName, string remoteAddress) :
            base(endpointConfigurationName, remoteAddress)
    {
    }

    public CalculatorClient(string endpointConfigurationName, EndpointAddress remoteAddress) :
            base(endpointConfigurationName, remoteAddress)
    {
    }

    public CalculatorClient(Binding binding, EndpointAddress remoteAddress) :
            base(binding, remoteAddress)
    {
    }

    public double Add(double n1, double n2)
    {
        return base.Channel.Add(n1, n2);
    }

    public double Subtract(double n1, double n2)
    {
        return base.Channel.Subtract(n1, n2);
    }

    public double Multiply(double n1, double n2)
    {
        return base.Channel.Multiply(n1, n2);
    }

    public double Divide(double n1, double n2)
    {
        return base.Channel.Divide(n1, n2);
    }
}

Public Class CalculatorClient
    Inherits System.ServiceModel.ClientBase(Of Microsoft.ServiceModel.Samples.ICalculator)
    Implements Microsoft.ServiceModel.Samples.ICalculator

    Public Sub New()
    End Sub

    Public Sub New(ByVal endpointConfigurationName As String)
        MyBase.New(endpointConfigurationName)
    End Sub

    Public Sub New(ByVal endpointConfigurationName As String, _
                   ByVal remoteAddress As String)
        MyBase.New(endpointConfigurationName, remoteAddress)
    End Sub

    Public Sub New(ByVal endpointConfigurationName As String, _
                   ByVal remoteAddress As EndpointAddress)
        MyBase.New(endpointConfigurationName, remoteAddress)
    End Sub

    Public Sub New(ByVal binding As Binding, _
                   ByVal remoteAddress As EndpointAddress)
        MyBase.New(binding, remoteAddress)
    End Sub

    Public Function Add(ByVal n1 As Double, _
                        ByVal n2 As Double) As Double Implements Microsoft.ServiceModel.Samples.ICalculator.Add
        Return MyBase.Channel.Add(n1, n2)
    End Function

    Public Function Subtract(ByVal n1 As Double, _
                             ByVal n2 As Double) As Double Implements Microsoft.ServiceModel.Samples.ICalculator.Subtract
        Return MyBase.Channel.Subtract(n1, n2)
    End Function

    Public Function Multiply(ByVal n1 As Double, _
                             ByVal n2 As Double) As Double Implements Microsoft.ServiceModel.Samples.ICalculator.Multiply
        Return MyBase.Channel.Multiply(n1, n2)
    End Function

    Public Function Divide(ByVal n1 As Double, _
                           ByVal n2 As Double) As Double Implements Microsoft.ServiceModel.Samples.ICalculator.Divide
        Return MyBase.Channel.Divide(n1, n2)
    End Function

End Class

Crie uma instância do que usa a BasicHttpBinding classe em um aplicativo cliente e, em seguida, chame as operações de ClientCalculator serviço no endereço especificado.


    //Client implementation code.
    class Client
    {
        static void Main()
        {

            //Specify the binding to be used for the client.
            BasicHttpBinding binding = new BasicHttpBinding();

            //Specify the address to be used for the client.
            EndpointAddress address =
               new EndpointAddress("http://localhost/servicemodelsamples/service.svc");

            // Create a client that is configured with this address and binding.
            CalculatorClient client = new CalculatorClient(binding, address);

            // 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();
        }
    }
}


    'Client implementation code.
    Friend Class Client
        Shared Sub Main()

            'Specify the binding to be used for the client.
            Dim binding As New BasicHttpBinding()

            'Specify the address to be used for the client.
            Dim address As New EndpointAddress("http://localhost/servicemodelsamples/service.svc")


            ' Create a client that is configured with this address and binding.
            Dim client As New CalculatorClient(binding, address)

            ' Call the Add service operation.
            Dim value1 = 100.0R
            Dim value2 = 15.99R
            Dim result = client.Add(value1, value2)
            Console.WriteLine("Add({0},{1}) = {2}", value1, value2, result)

            ' Call the Subtract service operation.
            value1 = 145.0R
            value2 = 76.54R
            result = client.Subtract(value1, value2)
            Console.WriteLine("Subtract({0},{1}) = {2}", value1, value2, result)

            ' Call the Multiply service operation.
            value1 = 9.0R
            value2 = 81.25R
            result = client.Multiply(value1, value2)
            Console.WriteLine("Multiply({0},{1}) = {2}", value1, value2, result)

            ' Call the Divide service operation.
            value1 = 22.0R
            value2 = 7.0R
            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()
        End Sub
    End Class
End Namespace

Compile e execute o cliente.

Consulte também

Usando associações para configurar serviços e clientes

Partilhar via

Como: Especificar uma vinculação de cliente no código

Para especificar uma associação personalizada no código

Consulte também

Recursos adicionais