Tests whether an element's parameter doesn't have a value.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 21.0.0.0 (21.1.1.109)
Since: 2020

Syntax

C#
`public class HasNoValueFilterRule : ParameterValuePresenceRule`

Visual Basic
`Public Class HasNoValueFilterRule _ Inherits ParameterValuePresenceRule`

Visual C++
`public ref class HasNoValueFilterRule : public ParameterValuePresenceRule`

Inheritance Hierarchy

System Object
Autodesk.Revit.DB FilterRule
Autodesk.Revit.DB ParameterValuePresenceRule
Autodesk.Revit.DB HasNoValueFilterRule