How to open an Excel file from stream?

25 May 20232 minutes to read

XlsIO provides support for opening a file that is stored as a stream. The following code snippet illustrates this.

using (ExcelEngine excelEngine = new ExcelEngine())
{
  IApplication application = excelEngine.Excel;

  //Opening a File from a Stream
  FileStream inputStream = new FileStream("Sample.xlsx", FileMode.Open, FileAccess.Read);
  IWorkbook workbook = application.Workbooks.Open(inputStream, ExcelOpenType.Automatic);
  FileStream stream = new FileStream("Output.xlsx", FileMode.OpenOrCreate, FileAccess.ReadWrite);
  workbook.SaveAs(stream);
  workbook.Close();
  excelEngine.Dispose();
}
using (ExcelEngine excelEngine = new ExcelEngine())
{
  IApplication application = excelEngine.Excel;
  application.DefaultVersion = ExcelVersion.Excel2013;

  //Opening a File from a Stream
  FileStream fileStream = new FileStream("Sample.xlsx", FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
  IWorkbook workbook = application.Workbooks.Open(fileStream);
  workbook.SaveAs("Output.xlsx");
}
Using excelEngine As ExcelEngine = New ExcelEngine()
  Dim application As IApplication = excelEngine.Excel
  application.DefaultVersion = ExcelVersion.Excel2013

  'Opening a File from a Stream
  Dim fileStream As New FileStream("Sample.xlsx", FileMode.Open, FileAccess.Read, FileShare.ReadWrite)
  Dim workbook As IWorkbook = application.Workbooks.Open(fileStream)
  workbook.SaveAs("Output.xlsx")
End Using

See Also