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How to: Specify a Service Binding in Code

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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.

For a description of how to configure this service using configuration elements instead of code, see How to: Specify a Service Binding in Configuration.

To specify in code to use the BasicHttpBinding for the service

  1. Define a service contract for the type of service.

    [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 in a service 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;
   }
}


    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 use 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 for the service, add the endpoint, and then open the host.

    

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


    host.Open();
}	

    

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

        host.Open()
    End With
End Using

To modify the default values of the binding properties

  1. To modify one of the default property values of the BasicHttpBinding class, set the property value on the binding to the new value before creating the host. For example, to change the default open and close timeout values of 1 minute to 2 minutes, use the following.

    
TimeSpan modifiedCloseTimeout = new TimeSpan(00, 02, 00);
binding1.CloseTimeout = modifiedCloseTimeout;

    
Dim modifiedCloseTimeout As New TimeSpan(0, 2, 0)
binding1.CloseTimeout = modifiedCloseTimeout

See also