Obtains the curent value of the global parameter. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 16.0.0.0 (16.0.0.0) 
  Since:  2016 Subscription Update 
Syntax
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Return Value
An instance of one of the classes derived from the ParameterValue base class.Remarks
Note that a value is always returned regardless of whether the parameter is formula-driven, or dimension-driven, or independent.
The returned ParameterValue is casted-up an instance of one of the derived classes, such as DoubleParameterValue or IntegerParameterValue .