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OperationBehaviorAttribute Class

Specifies the local execution behavior of a service method.

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

public sealed class OperationBehaviorAttribute : Attribute, 

Use the OperationBehaviorAttribute attribute to indicate what operation-specific execution behavior the operation has when executed. (To specify execution behavior at the service level, use the ServiceBehaviorAttribute attribute.)


You can also use OperationBehaviorAttribute to configure a callback contract operation in a duplex client application. When used on a callback operation, the ReleaseInstanceMode property must be None or an InvalidOperationException exception is thrown at runtime.

The OperationBehaviorAttribute attribute is a Windows Communication Foundation (WCF) programming model feature that enables common features that developers otherwise must implement themselves.

  • The AutoDisposeParameters property controls whether parameter objects passed to an operation are disposed when the operation completes.

  • The TransactionAutoComplete property specifies whether the transaction in which the method executes is automatically committed if no unhandled exceptions occur.

  • The TransactionScopeRequired property specifies whether a method must execute within a transaction.

  • The Impersonation property specifies whether the service operation can, must, or cannot impersonate the caller's identity.

  • The ReleaseInstanceMode property specifies when service objects are recycled during the method invocation process.

The following code example shows an operation that executes within a mandatory distributed transaction. The TransactionScopeRequired property indicates that the method executes under the caller's transaction and the TransactionAutoComplete property indicates that if no unhandled exceptions occur, the transaction commits automatically. If an unhandled exception does occur, the transaction is aborted.

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

namespace Microsoft.WCF.Documentation
  [ServiceContract(Namespace="http://microsoft.wcf.documentation", SessionMode=SessionMode.Required)]
  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