ServiceBehaviorAttribute Class


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Specifies the internal execution behavior of a service contract implementation.

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


public sealed class ServiceBehaviorAttribute : Attribute, IServiceBehavior


Initializes a new instance of the ServiceBehaviorAttribute class.


Gets or sets the AddressFilterMode that is used by the dispatcher to route incoming messages to the correct endpoint.


Specifies whether to automatically close a session when a client closes an output session.


Gets or sets whether a service supports one thread, multiple threads, or reentrant calls.


Gets or sets the value used to locate the service element in an application configuration file.


Gets or sets a value that indicates whether the service ordered dispatch is ensured.


Gets or sets a value that specifies whether to send unknown serialization data onto the wire.


Gets or sets a value that specifies that general unhandled execution exceptions are to be converted into a System.ServiceModel.FaultException<TDetail> of type System.ServiceModel.ExceptionDetail and sent as a fault message. Set this to true only during development to troubleshoot a service.


Gets or sets the value that indicates when new service objects are created.


Gets or sets the maximum number of items allowed in a serialized object.


Gets or sets the value of the name attribute in the service element in Web Services Description Language (WSDL).


Gets or sets the value of the target namespace for the service in Web Services Description Language (WSDL).


Gets or sets a value that specifies whether the service object is released when the current transaction completes.


Gets or sets a value that specifies whether pending transactions are completed when the current session closes without error.


Specifies the transaction isolation level for new transactions created inside the service, and incoming transactions flowed from a client.


Gets or sets the period within which a transaction must complete.


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


Gets or sets a value that specifies whether to use the current synchronization context to choose the thread of execution.


Gets or sets a value that specifies whether the system or the application enforces SOAP MustUnderstand header processing.


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.)


Retrieves an object that implements the service and that is used as the singleton instance of the service, or null if there is no singleton instance.


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.)


Specifies an object that implements the service and that is used as the singleton instance of the service.


Returns a value that indicates whether the ConfigurationName property has changed from its default value and should be serialized.


Returns a value that indicates whether the ReleaseServiceInstanceOnTransactionComplete property has changed from its default value and should be serialized.


Returns a value that indicates whether the TransactionAutoCompleteOnSessionClose property has changed from its default value and should be serialized.


Returns a value that indicates whether the TransactionIsolationLevel property has changed from its default value and should be serialized.


Returns a value that indicates whether the TransactionTimeout property has changed from its default value and should be serialized.


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_privmethodIServiceBehavior.AddBindingParameters(ServiceDescription, ServiceHostBase, Collection<ServiceEndpoint>, BindingParameterCollection)

Passes custom data objects to the bindings that support the behavior properties.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIServiceBehavior.ApplyDispatchBehavior(ServiceDescription, ServiceHostBase)

Customizes the service run time to support the behavior properties.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIServiceBehavior.Validate(ServiceDescription, ServiceHostBase)

Confirms that the service description and service host are capable of supporting the behavior.

Apply the ServiceBehaviorAttribute attribute to a service implementation to specify service-wide execution behavior. (To specify execution behavior at the method level, use the OperationBehaviorAttribute attribute.) This attribute can be applied only to service implementations. For working examples, see the Service Behaviors Samples.

ServiceBehaviorAttribute properties are a Windows Communication Foundation (WCF) programming model feature that enables common features that developers otherwise have to implement. For more information about these and other behaviors, see Specifying Service Run-Time Behavior. For more information about the underlying runtime properties that some of the following properties set, see Extending ServiceHost and the Service Model Layer.

  • The AddressFilterMode property specifies the type of filter that the dispatcher system uses to locate the endpoint that handles requests.

  • The AutomaticSessionShutdown property automatically closes the session when the channel is closed and the service has finished processing any remaining messages.

  • The ConcurrencyMode property controls the internal threading model, enabling support for reentrant or multithreaded services.

  • The ConfigurationName property is used to declare a name for use in the name attribute of the <service> element in a configuration file.

  • The IgnoreExtensionDataObject property enables the run time to ignore extra serialization information that is not required to process the message.

  • The IncludeExceptionDetailInFaults property specifies whether unhandled exceptions in a service are returned as SOAP faults. This is for debugging purposes only.

  • The InstanceContextMode property specifies whether and when services and their service objects are to be recycled during an exchange with a client.

  • The MaxItemsInObjectGraph property to limit on the number of items in an object graph that are serialized.

  • The Name and Namespace properties control the name and namespace for the WSDL expression of the service element.

  • The ReleaseServiceInstanceOnTransactionComplete property specifies whether the service object is recycled when a transaction completes.

  • The TransactionAutoCompleteOnSessionClose property specifies whether outstanding transactions are completed when the session closes.

  • The TransactionIsolationLevel property specifies the transaction isolation level that the contract supports.

  • The TransactionTimeout property specifies the time period within which a transaction must complete or it aborts.

  • The UseSynchronizationContext property indicates whether to synchronize inbound method calls with the user interface thread automatically.

  • The ValidateMustUnderstand property informs the system whether it should confirm that SOAP headers marked as MustUnderstand have, in fact, been understood.

The IncludeExceptionDetailInFaults property can also be set using an application configuration file. For details, see IncludeExceptionDetailInFaults.

The following code example demonstrates the ServiceBehaviorAttribute properties. The BehaviorService class uses the ServiceBehaviorAttribute attribute to indicate that:

  • The service object is recycled when the transaction completes.

  • There is one service object for each session.

  • The service is single-threaded and does not support reentrant calls.

Furthermore, at the operation level, the OperationBehaviorAttribute values indicate that the TxWork method automatically enlists in flowed transactions or creates a new transaction to do the work, and that the transaction is committed automatically if an unhandled exception does not occur.

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:
     *   -- The executing transaction is committed when
     *        the operation completes without an 
     *        unhandled exception
     *   -- Always executes under a flowed transaction.
      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."

The underlying binding must support flowed transactions for the following code example to execute properly. To support flowed transactions using the WSHttpBinding, for example, set the TransactionFlow property to true in code or in an application configuration file. The following code example shows the configuration file for the preceding sample.

.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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