M

FamilyType.AsDouble

Description:
Provides access to the double precision number of the given family parameter.

public Nullable<double> AsDouble(
	FamilyParameter familyParameter
)

Public Function AsDouble ( _
	familyParameter As FamilyParameter _
) As Nullable(Of Double)

public:
Nullable<double> AsDouble(
	FamilyParameter^ familyParameter
)

Autodesk.Revit.DB.FamilyParameter

familyParameter

Return Value nullNothingnullptr The double value contained in the parameter. Returns null Nothing nullptr a null reference ( Nothing in Visual Basic) if the storage type of the input argument is not double type or this parameter has no value.

Autodesk.Revit.Exceptions.ArgumentNullException

Thrown when the input argument-"familyParameter"-isnullNothingnullptra null reference (Nothingin Visual Basic).
Autodesk.Revit.Exceptions.ArgumentException

Thrown if the input argument-"familyParameter"-is invalid,