Revit 2026 API
IExternal |
An interface that supports addition of external applications to Revit.
Namespace: Autodesk.Revit.UI
Assembly: RevitAPIUI (in RevitAPIUI.dll) Version: 26.0.4.0 (26.0.4.0)
Syntax
The IExternalApplication type exposes the following members.
Methods
Name | Description | |
---|---|---|
![]() | OnShutdown | Implement this method to execute some tasks when Autodesk Revit shuts down. |
![]() | OnStartup | Implement this method to execute some tasks when Autodesk Revit starts. |

External applications are permitted to customize the Revit UI, and to add events
and updaters to the session.
See Also