This property indicates whether this parameter should be hidden from the properties palette
when it doesn't have a value.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.1.0.0 (26.1.0.34)
Syntax
C#
public bool HideWhenNoValue { get; set; }
Property Value
BooleanTrue if the parameter should be hidden when it has no value, False if the parameter should remain visible in the properties palette even when it doesn't have a value. The default is false