Property to check whether the instance can be extended and return the interface for extension operation.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0)

Syntax

C#
`public IExtension ExtensionUtility { get; }`

Visual Basic
`Public ReadOnly Property ExtensionUtility As IExtension Get`

Visual C++
`public: property IExtension^ ExtensionUtility { IExtension^ get (); }`

Remarks

If the family instance can not support extension operation, it returns a null reference ( Nothing in Visual Basic)