Gets a custom extension for this Worksheet object.
Assembly: Microsoft.Office.Tools.Excel (in Microsoft.Office.Tools.Excel.dll)
A custom extension is an implementation of the IWorksheetExtension interface in an Excel solution that is created by using the Office development tools in Visual Studio. In document-level projects, this property returns an instance of the generated worksheet host item by default.
- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.