How to: Exchange Messages Within a Reliable Session

Article
08/07/2009

This topic outlines the steps required to enable a reliable session using one of the system-provided bindings that support such a session, but not by default. The reliable session can be enabled imperatively using code or declaratively in the configuration file. This procedure uses the client and service configuration filesto enable the reliable session and to stipulate that the messages arrive in the same order in which they were sent.

The key part of this procedure is that the endpoint configuration element contain a bindingConfiguration attribute that references a binding configuration named "Binding1." The <binding> configuration element can then reference this name to enable reliable sessions by setting the enabled attribute of the reliableSession element to true. You specify the ordered delivery assurances for the reliable session by setting the ordered attribute to true.

For the source copy of this example, see WS Reliable Session.

To configure the service with a WSHttpBinding to use a reliable session

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);
}

Implement the service contract in a service class. Note that address or binding information is not specified inside the implementation of the service. Also, code does not have to be written to retrieve that information from the configuration file.

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;
   }
}

Create a Web.config file to configure an endpoint for the CalculatorService that uses the WSHttpBinding with reliable session enabled and ordered delivery of messages required.

Create a Service.svc file that contains the line:

<%@ServiceHost language=c# Service="CalculatorService" %>

Place the Service.svc file in your Internet Information Services (IIS) virtual directory.

To configure the client with a WSHttpBinding to use a reliable session

Use the ServiceModel Metadata Utility Tool (Svcutil.exe) from the command line to generate code from service metadata:
```
Svcutil.exe <service's Metadata Exchange (MEX) address or HTTP GET address> 
```

The client that is generated contains the ICalculator interface that defines the service contract that the client implementation must satisfy.

//Generated interface defining the ICalculator contract   
    [System.ServiceModel.ServiceContractAttribute(
    Namespace="http://Microsoft.ServiceModel.Samples",              ConfigurationName="Microsoft.ServiceModel.Samples.ICalculator")]
    public interface ICalculator
    {

        [System.ServiceModel.OperationContractAttribute(
    Action="http://Microsoft.ServiceModel.Samples/ICalculator/Add",         ReplyAction="http://Microsoft.ServiceModel.Samples/ICalculator/AddResponse")]
        double Add(double n1, double n2);

            [System.ServiceModel.OperationContractAttribute(
    Action="http://Microsoft.ServiceModel.Samples/ICalculator/Subtract",    ReplyAction="http://Microsoft.ServiceModel.Samples/ICalculator/SubtractResponse")]
        double Subtract(double n1, double n2);

            [System.ServiceModel.OperationContractAttribute(
    Action="http://Microsoft.ServiceModel.Samples/ICalculator/Multiply",    ReplyAction="http://Microsoft.ServiceModel.Samples/ICalculator/MultiplyResponse")]
        double Multiply(double n1, double n2);

            [System.ServiceModel.OperationContractAttribute(
    Action="http://Microsoft.ServiceModel.Samples/ICalculator/Divide",  ReplyAction="http://Microsoft.ServiceModel.Samples/ICalculator/DivideResponse")]
        double Divide(double n1, double n2);
    }

The generated client application also contains the implementation of the ClientCalculator. Note that the address and binding information is not specified anywhere inside the implementation of the service. Also, code does not have to be written to retrieve that information from the configuration file.

Svcutil.exe also generates the configuration for the client that uses the WSHttpBinding class. This file should be named the App.config file when using Visual Studio.

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <system.serviceModel>

    <client>
      <endpoint 
          address="https://localhost/servicemodelsamples/service.svc" 

          <!-- specify wsHttpBinding binding and a binding configuration to use. -->
          binding="wsHttpBinding" 
          bindingConfiguration="Binding1" 
          contract="Microsoft.ServiceModel.Samples.ICalculator" />
    </client>

    <!-- Configures WSHttpBinding for reliable sessions with ordered delivery. -->
    <bindings>
      <wsHttpBinding>
        <binding name="Binding1">
          <reliableSession enabled="true"
               ordered="true" />
        </binding>
      </wsHttpBinding>
    </bindings>

  </system.serviceModel>

</configuration>

Create an instance of the ClientCalculator in an application and then call the service operations.

//Client implementation code.
class Client
{
    static void Main()
    {
        // Create a client with given client endpoint configuration
        CalculatorClient client = new CalculatorClient();

        // 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();
    }
}

Compile and run the client.

Example

Several of the system-provided bindings support reliable sessions by default. These include:

For an example of how to create a custom binding that supports reliable sessions, see How to: Create a Custom Reliable Session Binding with HTTPS.

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How to: Exchange Messages Within a Reliable Session

To configure the service with a WSHttpBinding to use a reliable session

To configure the client with a WSHttpBinding to use a reliable session

Example

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