The base class for the event arguments used by the DialogBoxShowing event. 
Namespace: Autodesk.Revit.UI.Events
Assembly: RevitAPIUI (in RevitAPIUI.dll) Version: 24.0.0.0 (24.0.0.0)
Since:  2010 
Syntax
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Remarks
 The actual type of the event arguments will be different depending upon the type of dialog shown. When the application receives this object, a dialog is to be displayed in Revit that requires user interaction. The OverrideResult function can be used to cause the dialog to be dismissed and return a desired result code. 
Inheritance Hierarchy
SystemObject
SystemEventArgs
Autodesk.Revit.DB.EventsRevitAPIEventArgs
Autodesk.Revit.DB.EventsRevitAPIPreEventArgs
Autodesk.Revit.UI.EventsDialogBoxShowingEventArgs
Autodesk.Revit.UI.EventsMessageBoxShowingEventArgs
Autodesk.Revit.UI.EventsTaskDialogShowingEventArgs
SystemEventArgs
Autodesk.Revit.DB.EventsRevitAPIEventArgs
Autodesk.Revit.DB.EventsRevitAPIPreEventArgs
Autodesk.Revit.UI.EventsDialogBoxShowingEventArgs
Autodesk.Revit.UI.EventsMessageBoxShowingEventArgs
Autodesk.Revit.UI.EventsTaskDialogShowingEventArgs