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TransactionFlowAttribute Class

Specifies whether a service operation accepts incoming transactions from a client.

Namespace:  System.ServiceModel
Assembly:  System.ServiceModel (in System.ServiceModel.dll)

public sealed class TransactionFlowAttribute : Attribute, 

The TransactionFlowAttribute is an attribute used declaratively to associate a specific transaction flow policy with a service operation. The TransactionFlowOption property of this attribute specifies whether the respective operation accepts a transaction flowed from the client, or if the operation requires the client to always flow a transaction. The TransactionFlowAttribute can also be used as an operation behavior to programmatically associate a transaction flow policy with a specific operation. In this case, it should be added to the Behaviors collection on the operation’s description.


The OperationContract for each method that uses the TransactionFlowAttribute must provide a fully-qualified Action string. A value of "*" is not supported.

The following code example shows the use of this enumeration together with the TransactionFlowOption class at the operation level.

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

namespace Microsoft.WCF.Documentation
  public interface IBehaviorService
    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
  public class BehaviorService : IBehaviorService, IDisposable
    Guid myID;

    public BehaviorService()
      myID = Guid.NewGuid();
        "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.
      TransactionAutoComplete = true,
      TransactionScopeRequired = true
    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()
        "Service "
        + myID.ToString()
        + " is being recycled."


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0