ProcessingInfo SourceType Property. Gets the type of the source object to be processed and the stage of operation. ABCpdf .NET PDF Library. From ABCpdf .net previous page next page SourceType Property Type Default Read Only Description [C#]ProcessingSourceType[Visual Basic]ProcessingSourceType See description. Yes Gets the type of the source object to be processed and the stage of operation. Notes The ProcessingSourceType enumeration may take the following values: Unknown Document Page PageContent Image ImageMask MultiFrameImage ImageFrame Stream Path Text FormXObject Shading The meaning of these source types depends on the operations. Example None. previous page start next page