Transaction.RollBack Method

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.4.0.0 (26.4.0.0)

Syntax

C#

public TransactionStatus RollBack()

Return Value

TransactionStatus
If finished successfully, this method returns TransactionStatus.RolledBack.

Be aware that the returned status does not have to be necessarily the same like the status returned by GetStatus() even when the method is called immediately after rolling back the transaction. Such difference may happen due to actions made by a transaction finalizer, if there was one set. (See FailureHandlingOptions for more details.)

Exceptions

Remarks

By rolling back a transaction, all changes made to the model are discarded. RollBack may only be called for a transaction that has been started. (Use the GetStatus() method to check the current state.) Be aware that rolling back may be delayed (as a result of failure handling.) Callers should always check the returned status to test whether a transaction was rolled back successfully. Only after rolling back is fully completed, the transaction may be started again.

Example

C#

public bool CreateGrid(Autodesk.Revit.DB.Document document, XYZ p1, XYZ p2)
{
   // All and any transaction should be enclosed in a 'using'
   // block or guarded within a try-catch-finally blocks
   // to guarantee that a transaction does not out-live its scope.
   using (Transaction transaction = new Transaction(document, "Creating Grid"))
   {
      // Must start a transaction to be able to modify a document
      if (TransactionStatus.Started == transaction.Start())
      {
         // We create a line and use it as an argument to create a grid
         Line gridLine = Line.CreateBound(p1, p2);

         if ((null != gridLine) && (null != Grid.Create(document, gridLine)))
         {
             if (TransactionStatus.Committed == transaction.Commit())
             {
                return true;
             }
         }

         // For we were unable to create the grid, we will roll the transaction back
         // (although on this simplified case we know there weren't any other changes)

         transaction.RollBack();
      }
   }
   return false;
}

VB

Public Function CreateGrid(document As Autodesk.Revit.DB.Document, p1 As XYZ, p2 As XYZ) As Boolean
    ' All and any transaction should be enclosed in a 'using'
    ' block or guarded within a try-catch-finally blocks
    ' to guarantee that a transaction does not out-live its scope.
    Using transaction As New Transaction(document, "Creating Grid")
        ' Must start a transaction to be able to modify a document
        If TransactionStatus.Started = transaction.Start() Then
            ' We create a line and use it as an argument to create a grid
            Dim gridLine As Line = Line.CreateBound(p1, p2)

       If (gridLine IsNot Nothing) AndAlso (Grid.Create(document, gridLine) IsNot Nothing) Then
          If TransactionStatus.Committed = transaction.Commit() Then
             Return True
          End If
       End If

            ' For we were unable to create the grid, we will roll the transaction back
            ' (although on this simplified case we know there weren't any other changes)

            transaction.RollBack()
        End If
    End Using
    Return False
End Function

See Also

Reference