TransactionFlowAttribute Class

Definition

Namespace:

System.ServiceModel

Assembly:

System.ServiceModel.dll

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

public ref class TransactionFlowAttribute sealed : Attribute, System::ServiceModel::Description::IOperationBehavior

[System.AttributeUsage(System.AttributeTargets.Method)]
public sealed class TransactionFlowAttribute : Attribute, System.ServiceModel.Description.IOperationBehavior

[<System.AttributeUsage(System.AttributeTargets.Method)>]
type TransactionFlowAttribute = class
    inherit Attribute
    interface IOperationBehavior

Public NotInheritable Class TransactionFlowAttribute
Inherits Attribute
Implements IOperationBehavior

Inheritance

Object

Attribute

TransactionFlowAttribute

Attributes

AttributeUsageAttribute

Implements

IOperationBehavior

Examples

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  
{  
  [ServiceContract(  
    Namespace="http://microsoft.wcf.documentation",   
    SessionMode=SessionMode.Required  
  )]  
  public interface IBehaviorService  
  {  
    [OperationContract]  
    [TransactionFlow(TransactionFlowOption.Mandatory)]  
    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  
    )]  
    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."  
      );  
    }  
  }  
}  

Remarks

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.

Note

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

Constructors

TransactionFlowAttribute(TransactionFlowOption)

Initializes a new instance of the TransactionFlowAttribute class.

Properties

Transactions	Gets a value that indicates whether the incoming transaction is supported.
TypeId	When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute)

Methods

Equals(Object)	Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute)
GetHashCode()	Returns the hash code for this instance. (Inherited from Attribute)
GetType()	Gets the Type of the current instance. (Inherited from Object)
IsDefaultAttribute()	When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute)
Match(Object)	When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
ToString()	Returns a string that represents the current object. (Inherited from Object)

Explicit Interface Implementations

_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)	Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute)
_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)
_Attribute.GetTypeInfoCount(UInt32)	Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute)
_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)	Provides access to properties and methods exposed by an object. (Inherited from Attribute)
IOperationBehavior.AddBindingParameters(OperationDescription, BindingParameterCollection)	Adds extra parameters (settings) to the binding context to support this operation's behavior. This method cannot be inherited.
IOperationBehavior.ApplyClientBehavior(OperationDescription, ClientOperation)	Attaches the attribute functionality to the ProxyOperation object for the method that the attribute marks. This method cannot be inherited.
IOperationBehavior.ApplyDispatchBehavior(OperationDescription, DispatchOperation)	Attaches the attribute functionality to the DispatchOperation object for the method that the attribute marks. This method cannot be inherited.
IOperationBehavior.Validate(OperationDescription)	Verifies that the operation can support this behavior. This method cannot be inherited.

See also

• Enabling Transaction Flow