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How to: Create a Service Endpoint in Code

  • Artikkeli

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.

To create a service endpoint in code

  1. Create the interface that defines the service contract.

    [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

  2. Implement the service contract defined in step 1.

    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;
   }
}


    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

  3. 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

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

BasicHttpBinding binding1 = new BasicHttpBinding();

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

Dim binding1 As New BasicHttpBinding()

  4. Create the host and call ServiceHost.AddServiceEndpoint(Type, Binding, String) or one of the other overloads to add the service endpoint for the host.

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


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

    To specify the binding in code but to use the default endpoints provided by the runtime, pass the base address into the constructor when creating the ServiceHost, and do not call ServiceHost.AddServiceEndpoint.

    ServiceHost host = new ServiceHost(typeof(CalculatorService), new Uri(baseAddress));

    Dim host As New ServiceHost(GetType(CalculatorService), New Uri(baseAddress))

    For more information about default endpoints, see Simplified Configuration and Simplified Configuration for WCF Services.

See also