Test the category id to make sure it is indeed a top-level built-in category.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 20.0.0.0 (20.0.0.377)
Since:  2015

Syntax

C#
public static bool IsValidCategoryId(
	ElementId categoryId,
	Document doc
)
Visual Basic
Public Shared Function IsValidCategoryId ( _
	categoryId As ElementId, _
	doc As Document _
) As Boolean
Visual C++
public:
static bool IsValidCategoryId(
	ElementId^ categoryId, 
	Document^ doc
)

Parameters

categoryId
Type: Autodesk.Revit.DB..::..ElementId
Category id to be tested.
doc
Type: Autodesk.Revit.DB..::..Document
Document to look up the category by id.

Return Value

False unless categoryId corresponds to a valid built-in top-level model category.

Exceptions

ExceptionCondition
Autodesk.Revit.Exceptions..::..ArgumentNullException A non-optional argument was NULL

See Also