OperationBehaviorAttribute Class


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Specifies the local execution behavior of a service method.

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


public sealed class OperationBehaviorAttribute : Attribute, IOperationBehavior


Initializes a new instance of the OperationBehaviorAttribute class.


Gets or sets whether parameters are to be automatically disposed.


Gets or sets a value that indicates the level of caller impersonation that the operation supports.


Gets or sets a value that indicates when in the course of an operation invocation to recycle the service object.


Gets or sets a value that indicates whether to automatically complete the current transaction scope if no unhandled exceptions occur.


Gets or sets a value that indicates whether the method requires a transaction scope for its execution.


When implemented in a derived class, gets a unique identifier for this Attribute.(Inherited from Attribute.)


This API supports the product infrastructure and is not intended to be used directly from your code. Returns a value that indicates whether this instance is equal to a specified object.(Inherited from Attribute.)


Returns the hash code for this instance.(Inherited from Attribute.)


Gets the Type of the current instance.(Inherited from Object.)


When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.(Inherited from Attribute.)


When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.(Inherited from Attribute.)


Returns a string that represents the current object.(Inherited from Object.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.)


Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

Provides access to properties and methods exposed by an object.(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethodIOperationBehavior.AddBindingParameters(OperationDescription, BindingParameterCollection)

Implements the AddBindingParameters method.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIOperationBehavior.ApplyClientBehavior(OperationDescription, ClientOperation)

Implements the client operation behavior.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIOperationBehavior.ApplyDispatchBehavior(OperationDescription, DispatchOperation)

Implements the service operation behavior.


Implements the validation behavior.

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."

.NET Framework
Available since 3.0

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

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