The exception that is thrown by the undo transaction framework when a modification operation is not allowed.

Namespace: Autodesk.Revit.Exceptions
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)

Syntax

C#
`[SerializableAttribute] public class ModificationForbiddenException : InvalidOperationException`

Visual Basic
`<SerializableAttribute> _ Public Class ModificationForbiddenException _ Inherits InvalidOperationException`

Visual C++
`[SerializableAttribute] public ref class ModificationForbiddenException : public InvalidOperationException`

Remarks

See also: [!:Autodesk::Revit::DB::Element::IsModifiable] and [!:Autodesk::Revit::DB::Document::IsModifiable].

SystemObject
  SystemException
    Autodesk.Revit.ExceptionsApplicationException
      Autodesk.Revit.ExceptionsInvalidOperationException
        Autodesk.Revit.ExceptionsModificationForbiddenException