SpreadSheetTasks

The .NET library for fast reading and writing Excel files (.xlsx, .xlsb). Some methods/ideas based on great libraries :

Installation

https://www.nuget.org/packages/SpreadSheetTasks/

Install-Package SpreadSheetTasks

dotnet add package SpreadSheetTasks

Usage

Read

using (XlsxOrXlsbReadOrEdit excelFile = new XlsxOrXlsbReadOrEdit())
{
   excelFile.Open("file.xlsx");
   excelFile.ActualSheetName = "sheet1";
   object[] row = null;
   while (excelFile.Read())
   {
       row ??= new object[excelFile.FieldCount];
       excelFile.GetValues(row);
   }
}

Write

using (XlsbWriter xlsx = new XlsbWriter("file.xlsb"))
{
  xlsx.AddSheet("sheetName");
  xlsx.WriteSheet(dataReader);
}

Benchamarks and more

XLSB Read

Method	FileName	Mean	Error	StdDev	Gen0	Gen1	Gen2	Allocated
'SpreadSheetTasks - XLSB Read - v1'	200kFile.xlsb	117.29 ms	1.907 ms	1.784 ms	3400.0000	2800.0000	1400.0000	68.49 MB
'SpreadSheetTasks - XLSB Read - v2'	200kFile.xlsb	138.62 ms	2.752 ms	2.826 ms	3000.0000	2000.0000	1000.0000	49.03 MB
'Sylvan.Data.Excel - XLSB Read'	200kFile.xlsb	147.70 ms	1.693 ms	1.500 ms	3000.0000	2500.0000	1500.0000	50.82 MB
'SpreadSheetTasks - XLSB Read - v1'	65K_R(...).xlsb [21]	60.25 ms	0.504 ms	0.447 ms	1555.5556	777.7778	777.7778	28.83 MB
'SpreadSheetTasks - XLSB Read - v2'	65K_R(...).xlsb [21]	75.96 ms	0.346 ms	0.323 ms	666.6667	-	-	13.66 MB
'Sylvan.Data.Excel - XLSB Read'	65K_R(...).xlsb [21]	90.80 ms	0.641 ms	0.535 ms	1000.0000	-	-	23.16 MB

XLSB Write

Method	ReaderType	Mean	Error	StdDev	Gen0	Allocated
'SpreadSheetTasks - XLSB Write'	GENERAL	178.8 ms	1.25 ms	1.11 ms	500.0000	30.57 MB
XlsbSylvanWrite	GENERAL	233.3 ms	1.14 ms	1.01 ms	-	36.75 MB

https://github.com/KrzysztofDusko/SpreadSheetTasks