OperationBehaviorAttribute.TransactionScopeRequired 屬性

定義

命名空間:

System.ServiceModel

組件:

System.ServiceModel.dll

取得或設定值，指出該方法在執行時是否需要異動範圍。

public:
 property bool TransactionScopeRequired { bool get(); void set(bool value); };

public bool TransactionScopeRequired { get; set; }

member this.TransactionScopeRequired : bool with get, set

Public Property TransactionScopeRequired As Boolean

屬性值

Boolean

如果方法必須有交易範圍才可執行，則為 true，否則為 false。 預設為 false。

範例

下列程式碼範例會示範在強制分散式交易中執行的作業。 TransactionScopeRequired 屬性會指出該作業會執行於交易範圍下，而 TransactionAutoComplete 屬性會指出如果沒有發生未處理的例外狀況，該交易範圍便會自動完成。 如果確實發生未處理的例外狀況，異動便會中止。

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
   *   -- Releases the service object when the transaction commits
   */
  [ServiceBehavior(
    ConcurrencyMode=ConcurrencyMode.Single,
    InstanceContextMode=InstanceContextMode.PerSession,
    ReleaseServiceInstanceOnTransactionComplete=true
  )]
  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
    '   *   -- Releases the service object when the transaction commits

    <ServiceBehavior(ConcurrencyMode:=ConcurrencyMode.Single, InstanceContextMode:=InstanceContextMode.PerSession, _
                     ReleaseServiceInstanceOnTransactionComplete:=True)> _
    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

備註

將 TransactionScopeRequired 設定為 true，即可要求您的作業執行於異動範圍內。 如果有可用的流動交易，該作業便會在該交易內執行。 如果沒有可用的流動交易，這時便會建立新的交易，並於執行作業時使用。 端點中指定的繫結會控制是否支援流動交易。 因此，如果要取得適當行為，您必須了解繫結和 TransactionScopeRequired 屬性是否允許交易流程之間的互動。 下表顯示可能的行為。

TransactionScopeRequired	繫結程序允許異動流程	呼叫者流動交易	結果
False	False	否	方法執行時不需交易。
True	False	否	方法建立新交易，並在其中執行。
True 或 False	否	是	傳回 SOAP 錯誤做為異動標頭。
False	True	是	方法執行時不需交易。
True	True	是	方法執行於流動交易下。