Parameter Class

System Object
Autodesk.Revit.DB APIObject
Autodesk.Revit.DB Parameter

	Name	Description
	Definition	Returns the Definition object that describes the data type, name and other details of the parameter.
	Element	The element to which this parameter belongs.
	GUID	The Guid for a shared parameter.
	HasValue	Identifies if the parameter has an assigned value.
	Id	The id of the parameter.
	IsReadOnly	Get the readonly property of the parameter. (Overrides APIObject IsReadOnly )
	IsShared	Identifies if the parameter is a shared parameter.
	StorageType	Describes the type that is used internally within the parameter to store its value.
	UserModifiable	Indicates whether the interactive user can modify the value of this parameter.

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	Name	Description
	AsDouble	Provides access to the double precision number within the parameter.
	AsElementId	Provides access to the Autodesk::Revit::DB::ElementId^ stored within the parameter.
	AsInteger	Provides access to the integer number within the parameter.
	AssociateWithGlobalParameter	Associates this parameter with a global parameter in the same document.
	AsString	Provides access to the string contents of the parameter.
	AsValueString	Get the parameter value as a string with units.
	AsValueString(FormatOptions)	Get the parameter value as a string with units.
	CanBeAssociatedWithGlobalParameter	Tests whether this parameter can be associated with the given global parameter.
	CanBeAssociatedWithGlobalParameters	Tests whether this parameter can be associated with any global parameter.
	ClearValue	Clears the parameter to its initial value.
	Dispose	Causes the object to release immediately any resources it may be utilizing. (Inherited from APIObject )
	DissociateFromGlobalParameter	Dissociates this parameter from a global parameter.
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object )
	GetAssociatedGlobalParameter	Returns a global parameter, if any, currently associated with this parameter.
	GetHashCode	Serves as the default hash function. (Inherited from Object )
	GetType	Gets the Type of the current instance. (Inherited from Object )
	GetTypeId	Gets the identifier of the parameter.
	GetUnitTypeId	Gets the identifier of the unit quantifying the parameter value.
	Set(Double)	Sets the parameter to a new real number value.
	Set(ElementId)	Sets the parameter to a new element id.
	Set(Int32)	Sets the parameter to a new integer value.
	Set(String)	Sets the parameter to a new string of text.
	SetMultiple
	SetValueString	Set the parameter value according to the input string.
	ToString	Returns a string that represents the current object. (Inherited from Object )

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The piece of data contained within the parameter can be either a Double, Integer, String or ElementId. The parameter object can be retrieved from any Element object using either a built in id, definition object or shared parameter guid. All Elements within Autodesk Revit contain Parameters. These are options that can be accessed in a generic fashion. Revit contains many built in parameter types but users and now developers, via the API, can add their own parameters in the form of shared parameters. The developer should become familiar with the Revit user interface for added and managing parameters and shared parameters before using this API. The user interface components can be found in the following locations: Element Properties dialog, Shared Parameters dialog (available from the File menu), Project Parameters dialog (available from the Settings menu), Family Types dialog (available from the Settings menu when editing a family). There are several relationships between the objects that make up the APIs exposure of parameters. The parameter object contains the data value. Parameter objects can be retrieved from Elements if you know its built-in id, its definition or its shared parameter guid. Each parameter has a definition. New parameters can be added to Elements by adding a ParameterBinding object to the Document object.

Reference