Curiosus.FileDataReaderWriters.Npoi 2.1.0

.NET 9.0 This package targets .NET 9.0. The package is compatible with this framework or higher. 
dotnet add package Curiosus.FileDataReaderWriters.Npoi --version 2.1.0
                    


                    

                
NuGet\Install-Package Curiosus.FileDataReaderWriters.Npoi -Version 2.1.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="Curiosus.FileDataReaderWriters.Npoi" Version="2.1.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="Curiosus.FileDataReaderWriters.Npoi" Version="2.1.0" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="Curiosus.FileDataReaderWriters.Npoi" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add Curiosus.FileDataReaderWriters.Npoi --version 2.1.0
                    


                    

                
#r "nuget: Curiosus.FileDataReaderWriters.Npoi, 2.1.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package Curiosus.FileDataReaderWriters.Npoi@2.1.0
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=Curiosus.FileDataReaderWriters.Npoi&version=2.1.0
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=Curiosus.FileDataReaderWriters.Npoi&version=2.1.0
                    


                            Install as a Cake Tool

Curiosus.FileDataReaderWriters.Npoi

NuGet Downloads Coverage

NPOI-based IFileWriter implementations that write XLSX files with the streaming workbook (SXSSFWorkbook), keeping only a window of rows in memory. Use it to export large tables to Excel.

Installation

dotnet add package Curiosus.FileDataReaderWriters.Npoi

Usage

  • NpoiXlsFileWriter(outputFilePath, logger, rowAccessWindowSize = 100) — one XLSX file, written on Dispose().
  • NpoiXlsMultiFileWriter(savePath, fileName, logger, rowAccessWindowSize = 100) — splits data into report.xlsx, report_part_2.xlsx, ... when a sheet reaches the XLSX row limit (1 048 576) and repeats the headers in every part. Call Flush() to write the last part before disposing.

Numbers, bool, string and DateTime values are written as typed cells (dates use yyyy-MM-dd HH:mm:ss), other values via ToString(); null and whitespace strings leave the cell empty.

using Curiosus.FileDataReaderWriters.Npoi;
using Curiosus.FileDataReaderWriters.Style;
using Curiosus.FileDataReaderWriters.Writers;

using (var writer = new NpoiXlsFileWriter("orders.xlsx", logger))
{
    var bold = writer.AddFormat(new FormatSettings { FontStyle = FontStyle.Bold, FontSize = 12 });
    var money = writer.AddFormat(new FormatSettings { DataFormat = "#,##0.00" });

    writer.AddHeaders(new[] { new CellData("Order", bold), new CellData("Created", bold), new CellData("Total", bold) });
    foreach (var order in orders)
    {
        writer.AppendLine(new[] { new CellData(order.Number), new CellData(order.CreatedAt), new CellData(order.Total, money) });
    }
} // the file is saved here

var multiWriter = new NpoiXlsMultiFileWriter(outputDirectory, "orders.xlsx", logger);
// ... AddHeaders / AppendLine ...
multiWriter.Flush();
multiWriter.Dispose();

See also

Product Compatible and additional computed target framework versions.
.NET net9.0 is compatible.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed.  net10.0 is compatible.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
2.1.0 37 10/3/2026
2.0.0 55 9/28/2026

https://github.com/curiosus-dev/Curiosus.Utils/blob/b2305f88a0a9e8d165883eaadb93c6909a6dfd89/src/FileData/Curiosus.FileDataReaderWriters.Npoi/CHANGELOG.md