Released: May 1, 2026

16.2.2 中的更新

特性

• PDF4NET
  • Duplicate redacted images.
  • PDFFlowTableContent.MaxRowHeight and PDFFlowTableRow.MaxHeight properties to limit the maximum height of a row.

修补程序

• PDF4NET
  • AppendFile method hangs indefinitely for some input files with invalid fields.
  • Text cannot be extracted if it is stroked with a pattern color and filled with a non-pattern color.
  • Tiff images with multiple alpha channels are not handled correctly.
  • DataMatrix actual data encoding is not selected correctly in some cases, when DataEncoding...

Released: Apr 1, 2026

16.2.1 中的更新

特性

• PDF4NET
  • Create PDFRawImage objects from COS image streams.
  • Added PDFDocumentFileAttachment.GetPayloadStream method for efficient access to large attachments.
• PDF4NET.View
  • WinForms - You can now select annotations outside page area.

修补程序

• PDF4NET
  • StructureTree cannot be loaded for some PDF files.
• PDF4NET.View
  • Loading a PDF file in incremental mode in PDFDocumentView throws an IO exception.
  • PDFDocumentView hangs on document load when running on .NET 10.
  • WinForms - PDFDocumentView.ContentPainted...

Released: Mar 4, 2026

16.2.0 中的更新

特性

• PDF4NET
  • Added support for PDFFowTableContent horizontal align.
• PDF4NET.View
  • Added annotation tooltips.
  • Added show/hide annotations.
  • Added show/hide form fields.
  • Added show/hide the page number indicator (bottom left corner).

修补程序

• PDF4NET
  • Fixed some 1bpp images which were not redacted correctly.
• PDF4NET.View
  • PDFDocumentView crashes when an annotation is added in PageRenderingCompleted event.
  • Some documents were displayed incorrectly because of caching across documents.

Released: Feb 1, 2026

16.1.2 中的更新

特性

PDF4NET

• Added support for page transparency group.
• PDF/A-1 validation now checks the presence of page transparency group.

PDF4NET.View

• Memory usage improvements.

修补程序

PDF4NET

• Colorspaces are not extracted from PDF file.
• Some existing PDF files are resaved incorrectly.

PDF4NET.Render

• Some text is not displayed because the backing TrueType font is invalid.
• Page with invalid font cannot be rendered, throws stack overflow exception.
• Text is not rendered correctly, characters are scrambled.

Released: Jan 5, 2026

16.1.1 中的更新

特性

PDF4NET

• PDFTextExtractionOptions has been renamed PDFTextExtractionContext.
• PDFContentExtractionContext.TextExtractionOptions has been renamed PDFContentExtractionContext.TextExtractionContext.

修补程序

PDF4NET

• Field border definition is generated even if it is not stroked.
• An exception is thrown when a multiline textbox field does not have a size and a color is set on it.
• Some existing PDF files are resaved incorrectly.
• Some incremental updates are not performed correctly.

PDF4NET.Render

• Thin...

Released: Dec 2, 2025

16.1.0 中的更新

特性

• Added support to retrieve contextual information when searching text in PDF files.
• Information about physical location of COS objects in the PDF file is now available in the public API.

PDF4NET.Render

• Memory usage optimizations.

PDF4NET.View

• Added support for incremental loading of PDF files.
• WinForms - Added support for custom drawing in the viewer area.

修补程序

• Behavior change: An exception is thrown if redaction overlay cannot be drawn because the page graphics has been closed.
• Damaged PDF...

Released: Nov 5, 2025

16.0.0 中的更新

特性

PDF4NET

• Updated calculation of text fragment run when font specifies invalid Ascent/Descent values.

PDF4NET.View

• Added a new viewer module.
• Added PDF viewer control for Windows Forms.
• Added PDF viewer control for Windows Presentation Foundation (WPF).

修补程序

PDF4NET

• PDF file could not be saved because of circular reference in form Xobjects.
• Pages with unknown fields could not be extracted from PDF files.
• Time stamp signatures were not loaded for signed fields.
• Some ligature glyphs were not...

Released: Oct 1, 2025

15.1.0 中的更新

特性

PDF4NET

• Added text horizontal scaling, for easier implementations of OCR to searchable PDF solutions.
• Added long words wrapping in formatted content.
• Now specify the page size when the page is created.

修补程序

PDF4NET

• Words were not extracted correctly from PDF file.
• Page was not extracted correctly from incorrect PDF file.
• Page could not be extracted from documents with invalid fields.
• Documents could not be signed if the certificate included multiple CRL URLs.
• Some PDF pages could not be...

Released: Sep 1, 2025

15.0.6 中的更新

特性

PDF4NET

• Pages with patterns can now be converted to RGB/CMYK.

修补程序

PDF4NET

• Unicode characters in SVG text were not displayed in the PDF page.
• Document with recursive actions could not be loaded.
• Button field did not display the icon if the caption is not set.

PDF4NET.Render

• Text using the 0x00 character, instead of 0x20 (space), is now rendered without spaces.

Released: Aug 1, 2025

15.0.5 中的更新

特性

PDF4NET

• Added support for disabling TrueType font subsetting.
• Updated generation of /BaseFont entry for TrueType fonts.

修补程序

PDF4NET

• RTL text cannot be wrapped in some situations.
• Document takes long time to load and save.
• Text markup annotations are not drawn correctly on rotated pages.
• PDFMerger does not correctly merge the trees in the /Names dictionary.

PDF4NET.Render

• Some PDF pages are not converted correctly to image.