WCF 可靠会话

昵称10504424 2013-03-11

展开全文

WCF SOAP 可靠消息传递提供 SOAP 终结点之间的端对端消息传输可靠性。此消息传递通过克服传输失败和 SOAP 消息级别失败，可在不可靠的网络上实现传输可靠性。具体而言，它为跨 SOAP 或传输中介发送的消息提供了一种基于会话的、单一的和（可选）有序的传送。基于对话的传送可按消息的顺序（可选）将消息分组到一个会话中。

简单的说可靠会话就是保证：

要使用 WCF 可靠会话，使用支持可靠会话的绑定创建一个终结点即可。默认情况下WSDualHttpBinding支持并启用可靠会话的系统定义的绑定。支持可靠会话但默认情况下不启用的系统提供的绑定包括：WSHttpBinding、WSFederationHttpBinding、NetTcpBinding。通过设置绑定的ReliableSessionBindingElement开启可靠会话，在配置文件中设置如下面所示：

<bindings>
    <wsHttpBinding>
        <binding name="Binding1">
            <reliableSession enabled="true" />
        </binding>
    </wsHttpBinding>
</bindings>

<endpoint address=""
          binding="wsHttpBinding"
          bindingConfiguration="Binding1" 
          contract="Microsoft.ServiceModel.Samples.ICalculator" />

在代码中使用：

Uri baseAddress = new Uri("http://localhost:8000/servicemodelsamples/service");

// Create a ServiceHost for the CalculatorService type and provide the base address.
using (ServiceHost serviceHost = new ServiceHost(typeof(CalculatorService), baseAddress))
{
    // Create a custom binding that contains two binding elements.
    ReliableSessionBindingElement reliableSession = new ReliableSessionBindingElement();
    reliableSession.Ordered = true;

    HttpTransportBindingElement httpTransport = new HttpTransportBindingElement();
    httpTransport.AuthenticationScheme = System.Net.AuthenticationSchemes.Anonymous;
    httpTransport.HostNameComparisonMode = HostNameComparisonMode.StrongWildcard;

    CustomBinding binding = new CustomBinding(reliableSession, httpTransport);

    // Add an endpoint using that binding.
    serviceHost.AddServiceEndpoint(typeof(ICalculator), binding, "");

    // Add a MEX endpoint.
    ServiceMetadataBehavior smb = new ServiceMetadataBehavior();
    smb.HttpGetEnabled = true;
    smb.HttpGetUrl = new Uri("http://localhost:8001/servicemodelsamples");
    serviceHost.Description.Behaviors.Add(smb);

    // Open the ServiceHostBase to create listeners and start listening for messages.
    serviceHost.Open();

    // The service can now be accessed.
    Console.WriteLine("The service is ready.");
    Console.WriteLine("Press <ENTER> to terminate service.");
    Console.WriteLine();
    Console.ReadLine();

    // Close the ServiceHostBase to shutdown the service.
    serviceHost.Close();
}