Password Protected Excel Download using EPPLUS

问题

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();
}

回答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);

回答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

回答3:

If you are saving the excel package into a MemoryStream (for sending as an email attachment) you have to do this:

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

来源：https://stackoverflow.com/questions/35285802/password-protected-excel-download-using-epplus