ObjectSoup IndexOf Function. Determines the index of a specific object. ABCpdf .NET PDF Library. From ABCpdf .net previous page next page IndexOf Function Determines the index of a specific object. Syntax [C#]int IndexOf(IndirectObject value) [Visual Basic]Function IndexOf(value As IndirectObject) As Integer Params Name Description value The object to locate in the Soup. return If found, the index of value, otherwise -1. Notes Determines the index of a specific IndirectObject in the Soup. Example None. previous page start next page