How to open an Excel file from stream?

4 Aug 20214 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;
    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
using (ExcelEngine excelEngine = new ExcelEngine())
{
    IApplication application = excelEngine.Excel;

    //Opening a File from a Stream
    Stream inputStream = new FileStream("Sample.xlsx", FileMode.Open, FileAccess.Read);
    IWorkbook workbook = await application.Workbooks.OpenAsync(inputStream, ExcelOpenType.Automatic);
	
    //Initializes FileSavePicker
    FileSavePicker savePicker = new FileSavePicker();
    savePicker.SuggestedStartLocation = PickerLocationId.Desktop;
    savePicker.SuggestedFileName = "Output";
    savePicker.FileTypeChoices.Add("Excel Files", new List<string>() { ".xlsx" });

    //Creates a storage file from FileSavePicker
    StorageFile storageFile = await savePicker.PickSaveFileAsync();

    //Saves changes to the specified storage file
    await workbook.SaveAsAsync(storageFile);
}
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;

    //Opening a File from a Stream
    Assembly assembly = typeof(App).GetTypeInfo().Assembly;
    Stream fileStream = assembly.GetManifestResourceStream("App.Sample.xlsx");
    IWorkbook workbook = application.Workbooks.Open(fileStream);
	
    MemoryStream stream = new MemoryStream();
    workbook.SaveAs(stream);

    stream.Position = 0;

    //Save the stream as a file in the device and invoke it for viewing
    Xamarin.Forms.DependencyService.Get<ISave>().SaveAndView("Output.xlsx", "application/msexcel", stream);
}

See Also