DependentTransaction DependentTransaction DependentTransaction DependentTransaction Class

Definition

Describes a clone of a transaction providing guarantee that the transaction cannot be committed until the application comes to rest regarding work on the transaction. This class cannot be inherited.

public ref class DependentTransaction sealed : System::Transactions::Transaction, System::Runtime::Serialization::ISerializable
[System.Serializable]
public sealed class DependentTransaction : System.Transactions.Transaction, System.Runtime.Serialization.ISerializable
type DependentTransaction = class
    inherit Transaction
    interface ISerializable
Public NotInheritable Class DependentTransaction
Inherits Transaction
Implements ISerializable
Inheritance
DependentTransactionDependentTransactionDependentTransactionDependentTransaction
Attributes
Implements

Examples

The following example shows you how to create a dependent transaction.

static void Main(string[] args)
{
	try
	{
		using (TransactionScope scope = new TransactionScope())
		{
			// Perform transactional work here.

			//Queue work item
			ThreadPool.QueueUserWorkItem(new WaitCallback(WorkerThread), Transaction.Current.DependentClone(DependentCloneOption.BlockCommitUntilComplete));

			//Display transaction information
			Console.WriteLine("Transaction information:");
			Console.WriteLine("ID:             {0}", Transaction.Current.TransactionInformation.LocalIdentifier);
			Console.WriteLine("status:         {0}", Transaction.Current.TransactionInformation.Status);
			Console.WriteLine("isolationlevel: {0}", Transaction.Current.IsolationLevel);

			//Call Complete on the TransactionScope based on console input
			ConsoleKeyInfo c;
			while (true)
			{
                      			Console.Write("Complete the transaction scope? [Y|N] ");
				c = Console.ReadKey();
				Console.WriteLine();

				if ((c.KeyChar == 'Y') || (c.KeyChar == 'y'))
				{
					//Call complete on the scope
					scope.Complete();
					break;
				}
				else if ((c.KeyChar == 'N') || (c.KeyChar == 'n'))
				{
					break;
				}
			}

		}
	}
	catch (System.Transactions.TransactionException ex)
	{
		Console.WriteLine(ex);
	}
	catch
	{
		Console.WriteLine("Cannot complete transaction");
		throw;
	}
	
}

private static void WorkerThread(object transaction)
{
	//Create a DependentTransaction from the object passed to the WorkerThread
	DependentTransaction dTx = (DependentTransaction)transaction;

	//Sleep for 1 second to force the worker thread to delay
	Thread.Sleep(1000);

	//Pass the DependentTransaction to the scope, so that work done in the scope becomes part of the transaction passed to the worker thread
	using (TransactionScope ts = new TransactionScope(dTx))
	{
		//Perform transactional work here.

		//Call complete on the transaction scope
		ts.Complete();
	}

	//Call complete on the dependent transaction
	dTx.Complete();
}
Public Shared Sub Main()
	Try
		Using scope As TransactionScope = New TransactionScope()

			'Perform transactional work here.

			'Queue work item
			ThreadPool.QueueUserWorkItem(AddressOf WorkerThread, Transaction.Current.DependentClone(DependentCloneOption.BlockCommitUntilComplete))

			'Display transaction information
			Console.WriteLine("Transaction information:")
			Console.WriteLine("ID:             {0}", Transaction.Current.TransactionInformation.LocalIdentifier)
			Console.WriteLine("status:         {0}", Transaction.Current.TransactionInformation.Status)
			Console.WriteLine("isolationlevel: {0}", Transaction.Current.IsolationLevel)

			'Call Complete on the TransactionScope based on console input
			Dim c As ConsoleKeyInfo
			While (True)

				Console.Write("Complete the transaction scope? [Y|N] ")
				c = Console.ReadKey()
				Console.WriteLine()
				If (c.KeyChar = "Y") Or (c.KeyChar = "y") Then
					scope.Complete()
					Exit While
				ElseIf ((c.KeyChar = "N") Or (c.KeyChar = "n")) Then
					Exit While
				End If
			End While
		End Using

	Catch ex As TransactionException
		Console.WriteLine(ex)
	Catch
		Console.WriteLine("Cannot complete transaction")
		Throw
	End Try
End Sub

Public Shared Sub WorkerThread(ByVal myTransaction As Object)

	'Create a DependentTransaction from the object passed to the WorkerThread
	Dim dTx As DependentTransaction
	dTx = CType(myTransaction, DependentTransaction)

	'Sleep for 1 second to force the worker thread to delay
	Thread.Sleep(1000)

	'Pass the DependentTransaction to the scope, so that work done in the scope becomes part of the transaction passed to the worker thread
	Using ts As TransactionScope = New TransactionScope(dTx)
		'Perform transactional work here.

		'Call complete on the transaction scope
		ts.Complete()
	End Using

	'Call complete on the dependent transaction
	dTx.Complete()
End Sub

Remarks

The DependentTransaction is a clone of a Transaction object created using the DependentClone method. Its sole purpose is to allow the application to come to rest and guarantee that the transaction cannot commit while work is still being performed on the transaction (for example, on a worker thread).

When the work done within the cloned transaction is finally complete and ready to be committed, it can inform the creator of the transaction using the Complete method. Thus you can preserve the consistency and correctness of data.

The DependentCloneOption enumeration is used to determine the behavior on commit. This behavior control allows an application to come to rest, as well as provides concurrency support. For more information on how this enumeration is used, see Managing Concurrency with DependentTransaction.

Methods

BeginCommitInternal(AsyncCallback) BeginCommitInternal(AsyncCallback) BeginCommitInternal(AsyncCallback) BeginCommitInternal(AsyncCallback) Inherited from Transaction
Clone() Clone() Clone() Clone()

Creates a clone of the transaction.

(Inherited from Transaction)
Complete() Complete() Complete() Complete()

Attempts to complete the dependent transaction.

DependentClone(DependentCloneOption) DependentClone(DependentCloneOption) DependentClone(DependentCloneOption) DependentClone(DependentCloneOption)

Creates a dependent clone of the transaction.

(Inherited from Transaction)
Dispose() Dispose() Dispose() Dispose()

Releases the resources that are held by the object.

(Inherited from Transaction)
EndCommitInternal(IAsyncResult) EndCommitInternal(IAsyncResult) EndCommitInternal(IAsyncResult) EndCommitInternal(IAsyncResult) Inherited from Transaction
EnlistDurable(Guid, IEnlistmentNotification, EnlistmentOptions) EnlistDurable(Guid, IEnlistmentNotification, EnlistmentOptions) EnlistDurable(Guid, IEnlistmentNotification, EnlistmentOptions) EnlistDurable(Guid, IEnlistmentNotification, EnlistmentOptions)

Enlists a durable resource manager that supports two phase commit to participate in a transaction.

(Inherited from Transaction)
EnlistDurable(Guid, ISinglePhaseNotification, EnlistmentOptions) EnlistDurable(Guid, ISinglePhaseNotification, EnlistmentOptions) EnlistDurable(Guid, ISinglePhaseNotification, EnlistmentOptions) EnlistDurable(Guid, ISinglePhaseNotification, EnlistmentOptions)

Enlists a durable resource manager that supports single phase commit optimization to participate in a transaction.

(Inherited from Transaction)
EnlistPromotableSinglePhase(IPromotableSinglePhaseNotification) EnlistPromotableSinglePhase(IPromotableSinglePhaseNotification) EnlistPromotableSinglePhase(IPromotableSinglePhaseNotification) EnlistPromotableSinglePhase(IPromotableSinglePhaseNotification)

Enlists a resource manager that has an internal transaction using a promotable single phase enlistment (PSPE).

(Inherited from Transaction)
EnlistPromotableSinglePhase(IPromotableSinglePhaseNotification, Guid) EnlistPromotableSinglePhase(IPromotableSinglePhaseNotification, Guid) EnlistPromotableSinglePhase(IPromotableSinglePhaseNotification, Guid) EnlistPromotableSinglePhase(IPromotableSinglePhaseNotification, Guid)

Enlists a resource manager that has an internal transaction using a promotable single phase enlistment (PSPE).

(Inherited from Transaction)
EnlistVolatile(IEnlistmentNotification, EnlistmentOptions) EnlistVolatile(IEnlistmentNotification, EnlistmentOptions) EnlistVolatile(IEnlistmentNotification, EnlistmentOptions) EnlistVolatile(IEnlistmentNotification, EnlistmentOptions)

Enlists a volatile resource manager that supports two phase commit to participate in a transaction.

(Inherited from Transaction)
EnlistVolatile(ISinglePhaseNotification, EnlistmentOptions) EnlistVolatile(ISinglePhaseNotification, EnlistmentOptions) EnlistVolatile(ISinglePhaseNotification, EnlistmentOptions) EnlistVolatile(ISinglePhaseNotification, EnlistmentOptions)

Enlists a volatile resource manager that supports single phase commit optimization to participate in a transaction.

(Inherited from Transaction)
Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Determines whether this transaction and the specified object are equal.

(Inherited from Transaction)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Returns the hash code for this instance.

(Inherited from Transaction)
GetPromotedToken() GetPromotedToken() GetPromotedToken() GetPromotedToken()

Gets the byte[] returned by the Promote method when the transaction is promoted.

(Inherited from Transaction)
GetType() GetType() GetType() GetType()

Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Creates a shallow copy of the current Object.

(Inherited from Object)
PromoteAndEnlistDurable(Guid, IPromotableSinglePhaseNotification, ISinglePhaseNotification, EnlistmentOptions) PromoteAndEnlistDurable(Guid, IPromotableSinglePhaseNotification, ISinglePhaseNotification, EnlistmentOptions) PromoteAndEnlistDurable(Guid, IPromotableSinglePhaseNotification, ISinglePhaseNotification, EnlistmentOptions) PromoteAndEnlistDurable(Guid, IPromotableSinglePhaseNotification, ISinglePhaseNotification, EnlistmentOptions)

Promotes and enlists a durable resource manager that supports two phase commit to participate in a transaction.

(Inherited from Transaction)
Rollback() Rollback() Rollback() Rollback()

Rolls back (aborts) the transaction.

(Inherited from Transaction)
Rollback(Exception) Rollback(Exception) Rollback(Exception) Rollback(Exception)

Rolls back (aborts) the transaction.

(Inherited from Transaction)
SetDistributedTransactionIdentifier(IPromotableSinglePhaseNotification, Guid) SetDistributedTransactionIdentifier(IPromotableSinglePhaseNotification, Guid) SetDistributedTransactionIdentifier(IPromotableSinglePhaseNotification, Guid) SetDistributedTransactionIdentifier(IPromotableSinglePhaseNotification, Guid)

Sets the distributed transaction identifier generated by the non-MSDTC promoter.

(Inherited from Transaction)
ToString() ToString() ToString() ToString()

Returns a string that represents the current object.

(Inherited from Object)

Explicit Interface Implementations

ISerializable.GetObjectData(SerializationInfo, StreamingContext) ISerializable.GetObjectData(SerializationInfo, StreamingContext) ISerializable.GetObjectData(SerializationInfo, StreamingContext) ISerializable.GetObjectData(SerializationInfo, StreamingContext)

Properties

IsolationLevel IsolationLevel IsolationLevel IsolationLevel

Gets the isolation level of the transaction.

(Inherited from Transaction)
PromoterType PromoterType PromoterType PromoterType

Uniquely identifies the format of the byte[] returned by the Promote method when the transaction is promoted.

(Inherited from Transaction)
TransactionInformation TransactionInformation TransactionInformation TransactionInformation

Retrieves additional information about a transaction.

(Inherited from Transaction)

Events

TransactionCompleted TransactionCompleted TransactionCompleted TransactionCompleted

Indicates that the transaction is completed.

(Inherited from Transaction)

Applies to

Thread Safety

This type is thread safe.

See also