Occurs when the command associated with this AddInCommandBinding initiates a check to determine whether the command can be executed on the command target.
Namespace: Autodesk.Revit.UI
Assembly: RevitAPIUI (in RevitAPIUI.dll) Version: 2015.0.0.0 (2015.0.0.0)
Since: 2013
Syntax
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Remarks
This callback will be called by Revit's user interface any time there is a contextual change. Therefore, the callback must be fast and is not permitted to be blocking in any way.