External |
The name of the class containing the implementation for the command.
Namespace: Autodesk.Revit.UI
Assembly: RevitAPIUI (in RevitAPIUI.dll) Version: 25.0.0.0 (25.0.0.0)
| Exception | Condition |
|---|---|
| ArgumentNullException | When setting this property: A non-optional argument was null |
The class name which implements the interface IExternalCommand.