Password Protected Excel Download using EPPLUS

Question

I am exporting data in Excel form using EPPLUS Excel Library. I want that when excel downloaded it will ask for password. I have tried following code.

FileInfo newFile = new FileInfo("sample.xlsx");
using (ExcelPackage package = new ExcelPackage(newFile)
{
    ExcelWorksheet ws = package.Workbook.Worksheets.Add("demo");
    ws.Cells[A1].LoadFromDataTable(dataTable, false);
    package.Workbook.Protection.SetPassword("EPPLUS");
    package.Save();
}

Answer 1

Just need to use the .Save overload with a password as the option:

package.Save("password");

Response To Comments

To apply a password if saving via a byte array it is very similar:

Byte[] bin = pck.GetAsByteArray("password");
System.IO.File.WriteAllBytes(fullFilePath, bin);

Answer 2

It's not documented, but you can do as following:

package.Encryption.Password = "your password here";

Then serve your package with Save() or GetAsByteArray() of your choice

Answer 3

如果您将 excel 包保存到 MemoryStream（作为电子邮件附件发送），您必须执行以下操作：

excelPackage.SaveAs(memoryStream, "pa$$w0rd");

Answer 4

package.GetAsByteArray("sometest"); ---> this will protect your excel sheet with password sometest :)