devexpress-office-file-api-excel-export

You can generate large Excel files with minimal memory usage by using a streaming API that writes rows sequentially to .xlsx, .xls, or .csv formats instead of loading entire workbooks into RAM. This approach eliminates high memory consumption and performance bottlenecks in .NET applications.

The best way to stream 100,000 rows to an XLSX file in C# is using a low-level streaming Excel export library that writes rows sequentially from databases or IEnumerable data sources. This ensures minimal memory footprint while supporting cell formatting, formulas, and tables.

Yes, the DevExpress Excel Export Library supports both modern .NET 6+ and legacy .NET Framework 4.6.2+ projects. You can use the DevExpress.Document.Processor package or corresponding assembly references to implement low-resource Excel file generation across these frameworks.

Yes, you can apply formulas, cell fonts, colors, borders, number formats, conditional formatting, and rich text when streaming Excel files. The streaming API also supports adding Excel tables, sparklines, pictures, print settings, AutoFilter, and data validation to the output.

Generating large Excel reports causes performance bottlenecks because standard in-memory spreadsheet APIs load entire workbooks into RAM. Using a streaming Excel generation approach writes rows sequentially, preventing server RAM exhaustion when processing large datasets from databases or data grids.

The primary limitation of using a streaming API for Excel export is that enforced streaming constraints require writing rows sequentially to ensure file integrity. This means you cannot load and manipulate entire existing workbooks in memory during the generation process.