Improved performance when importing large DataTables into worksheets, reducing load times for multi-million-cell spreadsheets.
Added a .NET 8 build of IronXL compiled against SixLabors.ImageSharp 4.1.3 and SixLabors.Fonts 3.x.
Updated internal dependencies.
修复
Fixed an issue where copying certain styled XLSX workbooks could result in a corrupted file and loss of styles.
Updated IronSoftware.System.Drawing to 2026.11.3 to resolve CVEs CVE-2026-106110 through CVE-2026-106116 via SixLabors.ImageSharp 4.1.3 on .NET 8+. Earlier .NET frameworks remain unaffected by this fix.
IronXL for .NET 2026.10.12026年9月30日
功能
Improved performance when importing large DataTables into worksheets, reducing load times for multi-million-cell spreadsheets.
Updated internal dependencies.
修复
Fixed an issue where copying certain styled XLSX workbooks could result in a corrupted file and loss of styles.
IronXL for .NET 2026.9.22026年9月1日
功能
Added low-memory streaming support for reading large XLSX worksheets row by row.
Updated internal dependencies.
修复
Fixed culture-specific numeric formatting and unstyled numeric cell handling.
IronXL for .NET 2026.8.12026年7月31日
功能
Updated internal dependencies.
修复
Fixed AutoSizeColumn incorrectly sizing columns containing DateTime values with localized built-in Excel date formats, preventing clipped (####) date displays.
Fixed =-prefixed text being parsed as formulas in Text-formatted cells or when prefixed with ', matching Excel behavior.
IronXL for .NET 2026.6.12026年5月25日
功能
Added support for 40+ modern Excel _xlfn.* functions, improving EvaluateAll() compatibility with Microsoft 365 workbooks.
Updated internal dependencies.
IronXL for .NET 2026.5.12026年4月27日
功能
Reduced peak memory usage during XLSX loading by 65-80%, improving reliability for large files in constrained environments.