Loading and saving workbook in ASP.NET Core

8 Dec 20231 minute to read

Opening an existing workbook from stream

You can open an existing workbook from stream by using the overloads of Open methods of IWorkbooks interface.

C# [Cross-platform]

//Creates a new instance for ExcelEngine
ExcelEngine excelEngine = new ExcelEngine();

//Initialize IApplication
IApplication application = excelEngine.Excel;

//Load the file into stream
FileStream inputStream = new FileStream("Sample.xlsx", FileMode.Open, FileAccess.Read);

//Loads or open an existing workbook through Open method of IWorkbooks
IWorkbook workbook = application.Workbooks.Open(inputStream);

Saving an Excel workbook to stream

You can also save the created or manipulated workbook to stream using overloads of SaveAs methods.

C# [Cross-platform]

//Creates a new instance for ExcelEngine
ExcelEngine excelEngine = new ExcelEngine();

//Initialize IApplication
IApplication application = excelEngine.Excel;

//Load the file into stream
FileStream inputStream = new FileStream("Sample.xlsx", FileMode.Open, FileAccess.Read);

//Loads or open an existing workbook through Open method of IWorkbooks
IWorkbook workbook = application.Workbooks.Open(inputStream);

//To-Do some manipulation
//To-Do some manipulation

//Set the version of the workbook
workbook.Version = ExcelVersion.Xlsx;

//Saving the workbook as stream
FileStream outputStream = new FileStream("Output.xlsx", FileMode.Create, FileAccess.ReadWrite);
workbook.SaveAs(outputStream);