NanoXLSX is a small .NET library written in C#, to create and read Microsoft Excel files in the XLSX format (Microsoft Excel 2007 or newer) in an easy and native way

• No dependencies (*
• No need for an installation of Microsoft Office
• No need for Office interop libraries
• No need for 3rd party libraries
• No need for an installation of the Microsoft Open Office XML SDK (OOXML)

Project website: https://picoxlsx.rabanti.ch

See the Change Log for recent updates.

Note: The reader functionality is currently limited to basic workbook data, cell values and formulas in worksheets. Styles and other data is not supported yet when it comes to reading of XLSX files. The scope of reader functionality may change with future versions. This version is directly derived from NanoXLSX4j and the available releases are currently in beta state.

NanoXLSX is based on PicoXLSX and was created with .NET version 4.5. Newer versions like 4.6.1 are working and tested. Older versions like 3.5 and 4.0 may also work with minor changes. Some functions introduced in .NET 4.5 were used and must be adapted in this case.

*)The only requirement to compile the library besides .NET is the assembly WindowsBase, as well as System.IO.Compression. These assemblies are standard components in all Microsoft Windows systems (except Windows RT systems). If your IDE of choice supports referencing assemblies from the Global Assembly Cache (GAC) of Windows, select WindowsBase and Compression from there. If you want so select the DLLs manually and Microsoft Visual Studio is installed on your system, the DLL of WindowsBase can be found most likely under “c:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\WindowsBase.dll”, as well as System.IO.Compression under "c:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.5\System.IO.Compression.dll". Otherwise you find them in the GAC, under “c:\Windows\Microsoft.NET\assembly\GAC_MSIL\WindowsBase” and "c:\Windows\Microsoft.NET\assembly\GAC_MSIL\System.IO.Compression"

If you want to compile the documentation project (folder: Documentation; project file: shfbproj), you need also the Sandcastle Help File Builder (SHFB). It is also freely available. But you don't need the documentation project to build the NanoXLSX library.

By package Manager (PM):

Install-Package NanoXLSX

By .NET CLI:

dotnet add package NanoXLSX

Simply place the NanoXLSX DLL into your .NET project and add a reference to it. Please keep in mind that the .NET version of your solution must match with the runtime version of the NanoXLSX DLL (currently compiled with 4.5).

Place all .CS files from the NanoXLSX source folder and its sub-folders into your project.

 Workbook workbook = new Workbook("myWorkbook.xlsx", "Sheet1");         // Create new workbook with a worksheet called Sheet1
 workbook.WS.Value("Some Data");                                        // Add cell A1
 workbook.WS.Formula("=A1");                                            // Add formula to cell B1
 workbook.WS.Down();                                                    // Go to row 2
 workbook.WS.Value(DateTime.Now, Style.BasicStyles.Bold);               // Add formatted value to cell A2
 workbook.Save();                                                       // Save the workbook as myWorkbook.xlsx

 Workbook workbook = new Workbook("myWorkbook.xlsx", "Sheet1");         // Create new workbook with a worksheet called Sheet1
 workbook.CurrentWorksheet.AddNextCell("Some Data");                    // Add cell A1
 workbook.CurrentWorksheet.AddNextCell(42);                             // Add cell B1
 workbook.CurrentWorksheet.GoToNextRow();                               // Go to row 2
 workbook.CurrentWorksheet.AddNextCell(DateTime.Now);                   // Add cell A2
 workbook.Save();                                                       // Save the workbook as myWorkbook.xlsx

 Workbook wb = Workbook.Load("basic.xlsx");                             // Read the workbook
 System.Console.WriteLine("contains worksheet name: " + wb.CurrentWorksheet.SheetName);
 foreach (KeyValuePair<string, Cell> cell in wb.CurrentWorksheet.Cells)
 {
    System.Console.WriteLine("Cell address: " + cell.Key + ": content:'" + cell.Value.Value + "'");
 }

See the full API-Documentation at: https://rabanti-github.github.io/NanoXLSX/.

The Demo project contains 14 simple use cases. You can find also the full documentation in the Documentation-Folder (html files or single chm file) or as C# documentation in the particular .CS files.

See also: Getting started in the Wiki