Returns ChangeType associated with a change in a parameter's value 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Parameters
- param
 -  Type:  Autodesk.Revit.DB Parameter  
Parameter for the ChangeType to trigger on 
Return Value
ChangeType that can be used to define a trigger for an Updater, triggering on parameter value changeRemarks
 Use this change type to trigger an Updater when the value of an element's parameter changes. Note: This change type will not trigger on newly created or deleted elements. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was a null reference ( Nothing in Visual Basic) |