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Transaction Class

A transaction makes sure that changes that were made to the store are treated as a group that can be committed or rolled back.


Namespace:  Microsoft.VisualStudio.Modeling
Assembly:  Microsoft.VisualStudio.Modeling.Sdk.12.0 (in Microsoft.VisualStudio.Modeling.Sdk.12.0.dll)

public class Transaction : MarshalByRefObject, 

The Transaction type exposes the following members.

Public propertyContextGets the transaction and enables clients to append user data to the transaction.
Public propertyContextInstanceGets the Context for this transaction.
Public propertyForceAllRulesToCommitTimeGets or sets a flag that forces all nested rules to occur at LocalCommit time for the current transaction.
Public propertyHasPendingChangesGets the transaction and verifies whether changes to the store have been made during this transaction.
Public propertyHaveCommitTimeRulesFiredIndicates whether the commit time rules have been fired or not
Public propertyIdGets the ID for this transaction.
Public propertyInRollbackGets the transaction and verifies whether this transaction is being rolled back.
Public propertyIsActiveGets the transaction and verifies whether this transaction is processing.
Public propertyIsHiddenGets the transaction and verifies whether the transaction is hidden.
Public propertyIsNestedGets the transaction and verifies whether a transaction is nested within another transaction.
Public propertyIsSerializingGets the transaction and verifies whether the transaction is currently serializing.
Public propertyNameGets or sets the name of the transaction.
Public propertyParentGets the top-level transaction that is assigned to the nested transaction.
Public propertyPartitionStatesGets information about the state of all partitions in the store.
Public propertySequenceNumberGets the sequence number for the transaction.
Public propertyStoreGets the store to which the transaction belongs.
Public propertyTopLevelTransactionGets the top-level transaction of the transaction hierarchy.
Public propertyTransactionDepthGets the number of transactions in which this transaction is nested.

Public methodCommitCommits the transaction.
Public methodCreateObjRefSecurity Critical. Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object. (Inherited from MarshalByRefObject.)
Public methodDisposeDisposes the state of the transaction.
Public methodEqualsDetermines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodFinalizeFinalizes the transaction. (Overrides Object.Finalize().)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetLifetimeServiceSecurity Critical. Retrieves the current lifetime service object that controls the lifetime policy for this instance. (Inherited from MarshalByRefObject.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodInitializeLifetimeServiceSecurity Critical. Obtains a lifetime service object to control the lifetime policy for this instance. (Inherited from MarshalByRefObject.)
Protected methodMemberwiseClone()Creates a shallow copy of the current Object. (Inherited from Object.)
Protected methodMemberwiseClone(Boolean)Creates a shallow copy of the current MarshalByRefObject object. (Inherited from MarshalByRefObject.)
Public methodRollbackThe Store will be set back to the state that it was in when the transaction was created.
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)

Public Extension MethodGetSerializationContextGet the SerializationContext active in the context of the specified transaction. The SerializationContext is stored in the TranactionContext of serializing transactions. If the transaction is nested the transaction stack is searched to find the nearest enclosing serialization transaction with a SerializationContext. (Defined by SerializationContextTransactionExtensions.)

A transaction enables you to group changes. It also keeps track of the actions that are performed in a transaction so that they can be undone at a later stage.

Changes to the store must be done in a transaction. Changes to the store are made only if the transaction commits. A transaction can have the store accept the changes when the local transaction is committed or when the top-level transaction is committed. Local transactions are nested in a top-level transaction. A nested transaction must commit or roll back before the next top-level transaction can commit or roll back. For more information, see the example for the TransactionDepth property.

A transaction also keeps track of the actions that have occurred. This enables a group of actions to be undone or redone at a later stage with the UndoManager property.

A transaction should be disposed. This can be done by using the Dispose method or by creating the transaction in a Using construct. If the transaction has not been committed when it is disposed, the transaction is automatically rolled back and any changes are canceled.

The following example shows a transaction that modifies the store. The transaction is committed. If the transaction is rolled back, any changes to the store are canceled. The transaction is disposed automatically at the end of the using block.

using (Transaction txCreateElem =  model.Store.TransactionManager.BeginTransaction("Create named element")
  A a = new A(store);
  a.Name = "Fred";
  // Commit the transaction and add the named element to the model

For examples and more information, see Using Transactions.

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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