Skip to content

Implement lazy loading for XSSFSheet — defer sheet.xml parsing to first content access #3

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
tonyqus merged 6 commits into from
Mar 21, 2026
Merged

Implement lazy loading for XSSFSheet — defer sheet.xml parsing to first content access #3

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
6 commits
Select commit Hold shift + click to select a range
c773357
Initial plan
Copilot Mar 20, 2026
af2db1c
Implement lazy loading for XSSF worksheets
Copilot Mar 20, 2026
fac3d46
Fix re-entrant EnsureWorksheetLoaded circular dependency
Copilot Mar 20, 2026
65a2c06
Add NUnit tests for XSSF lazy loading
Copilot Mar 20, 2026
2fbd59b
Implement Variant A lazy loading for XSSF worksheets
Copilot Mar 20, 2026
0887acd
Add static switch for XSSFSheet lazy loading
tonyqus Mar 21, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
4 changes: 4 additions & 0 deletions ooxml/XSSF/UserModel/XSSFChartSheet.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -80,24 +80,28 @@ internal override void Read(Stream is1)
*/
public CT_Chartsheet GetCTChartsheet()
{
EnsureWorksheetLoaded();
return chartsheet;
}


protected override NPOI.OpenXmlFormats.Spreadsheet.CT_Drawing GetCTDrawing()
{
EnsureWorksheetLoaded();
return chartsheet.drawing;
}


protected override NPOI.OpenXmlFormats.Spreadsheet.CT_LegacyDrawing GetCTLegacyDrawing()
{
EnsureWorksheetLoaded();
return chartsheet.legacyDrawing;
}


internal override void Write(Stream out1, bool leaveOpen=false)
{
EnsureWorksheetLoaded();
new ChartsheetDocument(this.chartsheet).Save(out1);
}

Expand Down
Loading
Loading