Starts the sub-transaction.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)
Since: 2011
Syntax
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Return Value
If started successfully, this method returns TransactionStatus.Started.Remarks
A sub-transaction can only be started in an open transaction, and it must be closed (committed or rolled back) while still inside the open transaction.
A sub-transaction can be started in another open sub-transaction, but then it must be closed before the parent sub-transaction is closed.
Exceptions
| Exception | Condition |
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| Autodesk.Revit.ExceptionsInvalidOperationException | Cannot modify the document for either a read-only external command is being executed, or changes to the document are temporarily disabled. -or- A sub-transaction can only be active inside an open Transaction. -or- The sub-transaction was already started and has not finished yet. |