OptionalContentMembershipExpression Property

The content element visibility function.

Optional content membership expression defines the visibility as a boolean function of OCG indices in C syntax. The OCG index represents the position of the element in the OCG list which can be retrieved by using OptionalContentGroups. Example: "1 || 2" means that the content element is visible if either OCG 1 or OCG 2 is ON.

Alternatively, the evaluated expression can be fetched via IsVisible.

Namespace: PdfTools.Toolbox.Pdf.Content
Assembly: PdfTools.Toolbox (in PdfTools.Toolbox.dll) Version: 1.3.0+2e7887cb8ae45c4d911ad975ad001ac2f1f257d8

Syntax

Copy

public string Expression { get; }

Property Value

String

Exceptions

Exception	Condition
InvalidOperationException	the object has already been closed

Reference

OptionalContentMembership Class

PdfTools.Toolbox.Pdf.Content Namespace