ServiceBehaviorAttribute.ReleaseServiceInstanceOnTransactionComplete Eigenschaft

Definition

Ruft einen Wert ab, der angibt, ob das Dienstobjekt freigegeben wird, wenn die aktuelle Transaktion abgeschlossen ist, oder legt diesen Wert fest.Gets or sets a value that specifies whether the service object is released when the current transaction completes.

public:
 property bool ReleaseServiceInstanceOnTransactionComplete { bool get(); void set(bool value); };
public bool ReleaseServiceInstanceOnTransactionComplete { get; set; }
member this.ReleaseServiceInstanceOnTransactionComplete : bool with get, set
Public Property ReleaseServiceInstanceOnTransactionComplete As Boolean

Eigenschaftswert

true, wenn das Dienstobjekt freigegeben werden soll, andernfalls false.true if the service object is to be released; otherwise, false. Die Standardeinstellung ist true.The default is true.

Beispiele

Im folgenden Codebeispiel wird die Transaktionsisolationsebene auf ReadCommitted festgelegt, die Unterstützung für gleichzeitige Transaktionen wird deaktiviert, es wird eine von einem Vorgangsaufruf übergebene Transaktion benötigt, und es wird automatisch ein Commit für die Transaktion im Dienst ausgeführt, wenn keine nicht behandelte Ausnahme auftritt.The following code example sets the transaction isolation level to ReadCommitted, disables support for concurrent transactions, requires a flowed transaction from the operation call, and commits the transaction on the service automatically if no unhandled exception occurs.

using System;
using System.ServiceModel;
using System.Transactions;

namespace Microsoft.WCF.Documentation
{
  [ServiceContract(
    Namespace="http://microsoft.wcf.documentation", 
    SessionMode=SessionMode.Required)]
  public interface IBehaviorService
  {
    [OperationContract]
    string TxWork(string message);
  }

  // Note: To use the TransactionIsolationLevel property, you 
  // must add a reference to the System.Transactions.dll assembly.
  /* The following service implementation:
   *   -- Processes messages on one thread at a time
   *   -- Creates one service object per session
   *   -- Does not release the service object when the transaction commits
   *   -- The isolation level is read committed.
   */
  [ServiceBehavior(
    ConcurrencyMode=ConcurrencyMode.Single,
    InstanceContextMode=InstanceContextMode.PerSession,
    ReleaseServiceInstanceOnTransactionComplete=false,
    TransactionIsolationLevel=System.Transactions.IsolationLevel.ReadCommitted
  )]
  public class BehaviorService : IBehaviorService, IDisposable
  {
    Guid myID;

    public BehaviorService()
    {
      myID = Guid.NewGuid();
      Console.WriteLine(
        "Object "
        + myID.ToString()
        + " created.");
    }

    /*
     * The following operation-level behaviors are specified:
     *   -- Always executes under a transaction scope.
     *   -- The transaction scope is completed when the operation terminates
     *       without an unhandled exception.
     */
    [OperationBehavior(
      TransactionAutoComplete = true,
      TransactionScopeRequired = true
    )]
    [TransactionFlow(TransactionFlowOption.Mandatory)]
    public string TxWork(string message)
    {
      // Do some transactable work.
      Console.WriteLine("TxWork called with: " + message);
      // Display transaction information.

      TransactionInformation info = Transaction.Current.TransactionInformation;
      Console.WriteLine("The distributed tx ID: {0}.", info.DistributedIdentifier);
      Console.WriteLine("The tx status: {0}.", info.Status);
      return String.Format("Hello. This was object {0}.",myID.ToString()) ;
    }

    public void Dispose()
    {
      Console.WriteLine(
        "Service "
        + myID.ToString()
        + " is being recycled."
      );
    }
  }
}


Imports System.ServiceModel
Imports System.Transactions

Namespace Microsoft.WCF.Documentation
  <ServiceContract(Namespace:="http://microsoft.wcf.documentation", SessionMode:=SessionMode.Required)> _
  Public Interface IBehaviorService
    <OperationContract> _
    Function TxWork(ByVal message As String) As String
  End Interface

  ' Note: To use the TransactionIsolationLevel property, you 
  ' must add a reference to the System.Transactions.dll assembly.
'   The following service implementation:
'   *   -- Processes messages on one thread at a time
'   *   -- Creates one service object per session
'   *   -- Does not release the service object when the transaction commits
'   *   -- The isolation level is read committed.
'   
    <ServiceBehavior(ConcurrencyMode:=ConcurrencyMode.Single, InstanceContextMode:=InstanceContextMode.PerSession, _
      ReleaseServiceInstanceOnTransactionComplete:=False, TransactionIsolationLevel:=System.Transactions.IsolationLevel.ReadCommitted)> _
    Public Class BehaviorService
        Implements IBehaviorService, IDisposable
        Private myID As Guid

        Public Sub New()
            myID = Guid.NewGuid()
            Console.WriteLine("Object " & myID.ToString() & " created.")
        End Sub

        '    
        '     * The following operation-level behaviors are specified:
        '     *   -- Always executes under a transaction scope.
        '     *   -- The transaction scope is completed when the operation terminates
        '     *       without an unhandled exception.
        '     
        <OperationBehavior(TransactionAutoComplete:=True, TransactionScopeRequired:=True), TransactionFlow(TransactionFlowOption.Mandatory)> _
        Public Function TxWork(ByVal message As String) As String Implements IBehaviorService.TxWork
            ' Do some transactable work.
            Console.WriteLine("TxWork called with: " & message)
            ' Display transaction information.

            Dim info As TransactionInformation = Transaction.Current.TransactionInformation
            Console.WriteLine("The distributed tx ID: {0}.", info.DistributedIdentifier)
            Console.WriteLine("The tx status: {0}.", info.Status)
            Return String.Format("Hello. This was object {0}.", myID.ToString())
        End Function

        Public Sub Dispose() Implements IDisposable.Dispose
            Console.WriteLine("Service " & myID.ToString() & " is being recycled.")
        End Sub
    End Class
End Namespace

Die zugrunde liegende Bindung muss Transaktionsflüsse unterstützen, damit das folgende Codebeispiel ordnungsgemäß ausgeführt wird.The underlying binding must support flowed transactions for the following code example to execute properly. Um Transaktionsflüsse mit WSHttpBinding zu unterstützen, legen Sie zum Beispiel die TransactionFlow-Eigenschaft im Code oder in einer Anwendungskonfigurationsdatei auf true fest.To support flowed transactions using the WSHttpBinding, for example, set the TransactionFlow property to true in code or in an application configuration file. Das folgende Codebeispiel zeigt eine Konfigurationsdatei für das vorhergehende Beispiel.The following code example shows a configuration file for the preceding sample.

<configuration>
  <system.serviceModel>
    <services>
      <service  
        name="Microsoft.WCF.Documentation.BehaviorService" 
        behaviorConfiguration="mex"
        >
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost:8080/BehaviorService"/>
            <add baseAddress="net.tcp://localhost:8081/BehaviorService"/>
          </baseAddresses>
        </host>
        <!--
          Note:
            This example code uses the WSHttpBinding to support transactions using the 
            WS-AtomicTransactions (WS-AT) protocol. WSHttpBinding is configured to use the  
            protocol, but the protocol is not enabled on some computers. Use the xws_reg -wsat+ 
            command to enable the WS-AtomicTransactions protocol in the MSDTC service.          
          -->
        <endpoint 
           contract="Microsoft.WCF.Documentation.IBehaviorService"
           binding="wsHttpBinding"
           bindingConfiguration="wsHttpBindingWithTXFlow"
           address="http://localhost:8080/BehaviorService"
          />
        <endpoint 
               contract="Microsoft.WCF.Documentation.IBehaviorService"
               binding="netTcpBinding"
               bindingConfiguration="netTcpBindingWithTXFlow"
               address="net.tcp://localhost:8081/BehaviorService"
          />
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="mex">
          <serviceMetadata httpGetEnabled="true"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <!-- binding configuration - configures a WSHttpBinding to require transaction flow -->
    <bindings>
      <wsHttpBinding>
        <binding name="wsHttpBindingWithTXFlow" transactionFlow="true" />
      </wsHttpBinding>
      <netTcpBinding>
        <binding name="netTcpBindingWithTXFlow" transactionFlow="true" />
      </netTcpBinding>
    </bindings>

  </system.serviceModel>
</configuration>

Hinweise

Beachten Sie, dass Sie ReleaseServiceInstanceOnTransactionComplete explizit auf false festlegen müssen, wenn ein Vorgang vorhanden ist, für den OperationBehaviorAttribute.TransactionScopeRequired auf "true" festgelegt ist, und Sie ConcurrencyMode auf Reentrant festlegen.Note that you must explicitly set ReleaseServiceInstanceOnTransactionComplete to false if there is an operation with OperationBehaviorAttribute.TransactionScopeRequired set to true and you set ConcurrencyMode to Reentrant. Andernfalls wird eine Validierungsausnahme ausgelöst, da der Standardwert von ReleaseServiceInstanceOnTransactionComplete true ist.Otherwise a validation exception is thrown because the default value of ReleaseServiceInstanceOnTransactionComplete is true.

Darüber hinaus ist es wichtig, zu bedenken, dass wenn der Dienst durch Übergabe eines Dienstobjekts an den ServiceHost.ServiceHost(Object, Uri[])-Konstruktor erstellt wird, der Wert dieser Eigenschaft so behandelt wird, als wäre er auf false festgelegt.In addition, it is important to realize that if the service is created by passing a service object to the ServiceHost.ServiceHost(Object, Uri[]) constructor, the value of this property is treated as if it were false.

Gilt für: