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: 17.0.0.0 (17.0.1090.0)
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 )`

doc: Type: Autodesk.Revit.DB Document
Document to look up the category by id.

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

Exceptions

Exception	Condition
Autodesk.Revit.Exceptions ArgumentNullException	A non-optional argument was NULL