NPOI 2.7.4 Release Notes

[tonyqus]

Release Date: Jun 29, 2025

Please Read What's New in NPOI 2.7.x

• Research NPOI Package Ranking in nuget.org #1532

Package Update

• Update Dependency libraries #1566
• Remove System.Security.Cryptography.Pkcs #1572

CI/CD Update

• Use NET 9 SDK in GitHub Actions to compile solution #1544
• Remove prefixes from cref tags #1527
• Enable recommended NET analyzers and suppress errors #1523

Enhancement

• Get the number of columns of a table in Word #1546
• Add support for bar grouping in bar and column charts #1533
• Add InsertNewHyperlinkRun method, and fix InsertNewRun and RemoveRun methods #1535
• Implement XWPFTable.NumberOfColumns #1555
• Add Right to Left Text Support in ICellStyle interface #1573
• XSSFSheet.CopySheet doesn't support cloning charts #1338
• XSSFChart axis enhancement #1569
• Added Copy Charts to Sheet.CopyTo #1556

Performance Enhancement

• Fix analyzer reported issues related to string usage #1528
• Fix dictionary usage related analyzer problems #1526
• Fix analyzer reported issues #1541
• Remove zero-length array allocations and use collection expression #1530
• Make non-public API methods static where applicable #1531
• Fix analysis errors related to non-concrete type usage #1547
• Use ZString StringBuilder to replace System.Text.StringBuilder #1542

NPOI Bug Fixes

• Account for image resolution units other than pixels per inch #1519
• Fix XWPFDocument FindAndReplaceTextInParagraph #1524
• Remove unnecessary BOM character generated in SXSSF SheetDataWriter #1575
• Validation cannot handle double quote #1369
• ReplaceText incorrect text changing. #666
• Fix CT_Point2D xml node prefix issue #1578
• Remove unnecessary BOM character generated in SXSSF SheetDataWriter #1575
• ExcelToHtmlConverter.ProcessWorkbook throws Illegal IndexedColor index: 0 error on .NET Core 3.1 #621

POI Bug Fixes

• [Bug 61246] fix issue where SXSSF sheet data has unicode surrogate chars replaced by '?'
• [Bug 60422] fix data formatter issue with specific format in German locale
• [Bug 58975] do not cast numberOfOperands to byte in AbstractFunctionPtg
• [Github-25] support excel number trailing comma format
• [Bug 65915] add test for 'OR' function bug-65915 add test for 'OR' function #1579
• [Bug 61059] fix NamePtg to read unsigned shorts instead of signed shorts, avoiding a AIOOBE when a workbook contains more than 32k Names.
• [Bug 61085] support table styles
• [Bug 60898] XSSFColor's getARGB() method returns a wrong color value when a workbook has a custom indexed color
• [Github-25] Add enable locking and tab color in SXSSFSheet.
• [Github-55] NumberFormatException if XSSFName.setNameName is set with a long name that looks similar to a cell address.
• [Bug 61110] remove deprecated, misspelled CellReference#isRowWithnRange and #isColumnWithnRange methods
• [Bug 61007] use CellFormat for all format strings containing multiple parts (";" delimited) and update unit test to expect the same values as Excel. Also added tests for the failing formats.
• [Bug 61049] fix ordering of builtin formulas
• [Bug 61060] teach DataFormatter about conditional formatting rules with number formats
  Add table style test cases
• [Github-52] add ExcelToHtmlConverter method that works on InputStreams.
• [Github-32] speed up Irr() Excel formula computation by replacing Math.pow() with multiplication.
• [Bug 61266] Test for old unsupported MS Write WRI files, and give a more helpful exception if found, plus unit tests
• [Bug-61268] avoid NegativeArraySizeException parsing doc file
• [Bug-61281] guard against index out of bounds in XSSFExportToXml column mapping
• [Bug 61294] prevent infinite loop in IOUtils' skipFully.
• [Bug-61048] SXSSF module writes wrong escape sequence for carriage returns

[SuTo63]

Bug in 2.7.4:
When an Excel document with a title bar that contains columns with comments is used as a template and filled with data without changing the title bar. The Excel document result is incorrect. When corrected by Excel, the comments are removed.

In version 2.5.6 of NPOI this works without any problems!

[tonyqus]

Please create an issue for this and upload your original Excel file. I'll check what's going on.