How to: Create a Service Endpoint in Code

Artigo
03/22/2010

In this example, an ICalculator contract is defined for a calculator service, the service is implemented in the CalculatorService class, and then its endpoint is defined in code, where it is specified that the service must use the BasicHttpBinding class.

It is usually the best practice to specify the binding and address information declaratively in configuration rather than imperatively in code. Defining endpoints in code is usually not practical because the bindings and addresses for a deployed service are typically different from those used while the service is being developed. More generally, keeping the binding and addressing information out of the code allows them to change without having to recompile or redeploy the application.

Procedure

To create a service endpoint in code

Create the interface that defines the service contract.

  <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

[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);
}

Implement the service contract defined in step 1.

Public Class CalculatorService
    Implements ICalculator

    Public Function Add(ByVal n1 As Double, _
                        ByVal n2 As Double) As Double Implements ICalculator.Add
        Return n1 + n2
    End Function

    Public Function Subtract(ByVal n1 As Double, _
                             ByVal n2 As Double) As Double Implements ICalculator.Subtract
        Return n1 - n2
    End Function

    Public Function Multiply(ByVal n1 As Double, _
                             ByVal n2 As Double) As Double Implements ICalculator.Multiply
        Return n1 * n2
    End Function

    Public Function Divide(ByVal n1 As Double, _
                           ByVal n2 As Double) As Double Implements ICalculator.Divide
        Return n1 / n2
    End Function

End Class

public class CalculatorService : ICalculator
{
   public double Add(double n1, double n2)
   {
      return n1 + n2;
   }
   public double Subtract(double n1, double n2)
   {
      return n1 - n2;
   }
   public double Multiply(double n1, double n2)
   {
      return n1 * n2;
   }
   public double Divide(double n1, double n2)
   {
      return n1 / n2;
   }
}

In the hosting application, create the base address for the service and the binding to be used with the service.

' Specify a base address for the service
Dim baseAddress = "https://localhost/CalculatorService"
' Create the binding to be used by the service.

Dim binding1 As New BasicHttpBinding()

// Specify a base address for the service

String baseAddress = "https://localhost/CalculatorService";
// Create the binding to be used by the service.

BasicHttpBinding binding1 = new BasicHttpBinding();

Create the host and call AddServiceEndpoint or one of the other overloads to add the service endpoint for the host.

Using host As New ServiceHost(GetType(CalculatorService))
    With host
        .AddServiceEndpoint(GetType(ICalculator), _
                                binding1, _
                                baseAddress)


using(ServiceHost host = new ServiceHost(typeof(CalculatorService)))
{
    host.AddServiceEndpoint(typeof(ICalculator),binding1, baseAddress);

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How to: Create a Service Endpoint in Code

Procedure

To create a service endpoint in code

See Also

Tasks

Recursos adicionais