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Anvisningar: Skapa en tjänst som kräver sessioner

Sessioner skapar ett delat tillstånd mellan två eller flera slutpunkter som möjliggör användbara funktioner som återanrop, säkerhet för flera hopp och associationer mellan klienter och tjänstinstanser. Mer information om sessioner i WCF-program (Windows Communication Foundation) finns i Använda sessioner.

För att ange att ett kontrakt kräver sin bindning för att stödja sessioner

  1. Skapa ett tjänstkontrakt med minst en åtgärd. Ett exempel på hur du skapar ett tjänstkontrakt finns i Så här definierar du ett tjänstkontrakt.

  2. System.ServiceModel.ServiceContractAttribute Ändra som deklarerar kontraktet genom att ange ServiceContractAttribute.SessionMode egenskapen till antingen:

  3. Konfigurera tjänstslutpunkten så att den använder en bindning som stöder sessioner. I följande konfigurationsexempel visas användningen av System.ServiceModel.WSDualHttpBinding, som stöder en WS-ReliableMessaging-session.

    <appSettings>
      <!-- use appSetting to configure base address provided by host -->
      <add key="baseAddress" value="http://localhost:8080/ServiceMetadata" />
    </appSettings>
    <system.serviceModel>
      <services>
        <service 
          name="Microsoft.WCF.Documentation.DuplexHello"
          behaviorConfiguration="mex"
        >
          <endpoint
            address="/DuplexService"
            binding="wsDualHttpBinding"
            contract="Microsoft.WCF.Documentation.IDuplexHello"
           />
          <endpoint
            address=""
            binding="mexHttpBinding"
            contract="IMetadataExchange"
          />
        </service>
      </services>
      <behaviors>
        <serviceBehaviors>
          <behavior name="mex" >
            <serviceMetadata httpGetEnabled="true" />
          </behavior>
        </serviceBehaviors>
      </behaviors>
    </system.serviceModel>
    

Exempel

Följande exempelkod visar hur du anger ett sessionskrav på kontraktsnivå och använder en konfigurationsfil för att stödja det kravet med bindningen System.ServiceModel.WSDualHttpBinding .

using System;
using System.Collections.Generic;
using System.ServiceModel;
using System.Threading;

namespace Microsoft.WCF.Documentation
{
  [ServiceContract(
    Name = "SampleDuplexHello",
    Namespace = "http://microsoft.wcf.documentation",
    CallbackContract = typeof(IHelloCallbackContract),
    SessionMode = SessionMode.Required
  )]
  public interface IDuplexHello
  {
    [OperationContract(IsOneWay = true)]
    void Hello(string greeting);
  }

  public interface IHelloCallbackContract
  {
    [OperationContract(IsOneWay = true)]
    void Reply(string responseToGreeting);
  }

  [ServiceBehaviorAttribute(InstanceContextMode=InstanceContextMode.PerSession)]
  public class DuplexHello : IDuplexHello
  {

    public DuplexHello()
    {
      Console.WriteLine("Service object created: " + this.GetHashCode().ToString());
    }

    ~DuplexHello()
    {
      Console.WriteLine("Service object destroyed: " + this.GetHashCode().ToString());
    }

    public void Hello(string greeting)
    {
      Console.WriteLine("Caller sent: " + greeting);
      Console.WriteLine("Session ID: " + OperationContext.Current.SessionId);
      Console.WriteLine("Waiting two seconds before returning call.");
      // Put a slight delay to demonstrate asynchronous behavior on client.
      Thread.Sleep(2000);
      IHelloCallbackContract callerProxy
        = OperationContext.Current.GetCallbackChannel<IHelloCallbackContract>();
      string response = "Service object " + this.GetHashCode().ToString() + " received: " + greeting;
      Console.WriteLine("Sending back: " + response);
      callerProxy.Reply(response);
    }
  }
}


Imports System.Collections.Generic
Imports System.ServiceModel
Imports System.Threading

Namespace Microsoft.WCF.Documentation
    <ServiceContract(Name:="SampleDuplexHello", Namespace:="http://microsoft.wcf.documentation", _
                     CallbackContract:=GetType(IHelloCallbackContract), SessionMode:=SessionMode.Required)> _
    Public Interface IDuplexHello
        <OperationContract(IsOneWay:=True)> _
        Sub Hello(ByVal greeting As String)
    End Interface

    Public Interface IHelloCallbackContract
        <OperationContract(IsOneWay:=True)> _
        Sub Reply(ByVal responseToGreeting As String)
    End Interface

    <ServiceBehaviorAttribute(InstanceContextMode:=InstanceContextMode.PerSession)> _
    Public Class DuplexHello
        Implements IDuplexHello

        Public Sub New()
            Console.WriteLine("Service object created: " & Me.GetHashCode().ToString())
        End Sub

        Protected Overrides Sub Finalize()
            Console.WriteLine("Service object destroyed: " & Me.GetHashCode().ToString())
        End Sub

        Public Sub Hello(ByVal greeting As String) Implements IDuplexHello.Hello
            Console.WriteLine("Caller sent: " & greeting)
            Console.WriteLine("Session ID: " & OperationContext.Current.SessionId)
            Console.WriteLine("Waiting two seconds before returning call.")
            ' Put a slight delay to demonstrate asynchronous behavior on client.
            Thread.Sleep(2000)
            Dim callerProxy As IHelloCallbackContract = OperationContext.Current.GetCallbackChannel(Of IHelloCallbackContract)()
            Dim response = "Service object " & Me.GetHashCode().ToString() & " received: " & greeting
            Console.WriteLine("Sending back: " & response)
            callerProxy.Reply(response)
        End Sub
    End Class
End Namespace
<appSettings>
  <!-- use appSetting to configure base address provided by host -->
  <add key="baseAddress" value="http://localhost:8080/ServiceMetadata" />
</appSettings>
<system.serviceModel>
  <services>
    <service 
      name="Microsoft.WCF.Documentation.DuplexHello"
      behaviorConfiguration="mex"
    >
      <endpoint
        address="/DuplexService"
        binding="wsDualHttpBinding"
        contract="Microsoft.WCF.Documentation.IDuplexHello"
       />
      <endpoint
        address=""
        binding="mexHttpBinding"
        contract="IMetadataExchange"
      />
    </service>
  </services>
  <behaviors>
    <serviceBehaviors>
      <behavior name="mex" >
        <serviceMetadata httpGetEnabled="true" />
      </behavior>
    </serviceBehaviors>
  </behaviors>
</system.serviceModel>

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