EPPlus: bug combining shapes and programmatic pictures - epplus

Question

Problem:
When I programatically open an Excel file that has shapes in it (eg. arrows), and then I modify this file by adding a new image to it (programatically), if I try to get the bytes (GetAsByteArray) of this new modified Excel file, it crashes.
Steps to reproduce bug:
Create an Excel file (xlsx) and add a shape in it (eg. an arrow)
Use this code to open that file and add a programmatic picture
string path = Server.MapPath("~/Content/input.xlsx");
using (Stream stream = System.IO.File.Open(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
// Read file
ExcelPackage excelPackage = new ExcelPackage(stream);
// Get worksheets
ExcelWorksheet worksheet = excelPackage.Workbook.Worksheets.FirstOrDefault();
// Add programmatic picture
worksheet.Drawings
.AddPicture("logo", new FileInfo(Server.MapPath("~/Content/logo.png")))
.SetPosition(5, 0, 5, 0);
byte[] output = File(excelPackage.GetAsByteArray(), "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "output.xlsx");
}
Any ideas or workarounds?

Answer 1

Try this code. It will give you the bytes after adding an image. But nothing else will happen to the Excel file.
//create a fileinfo object of an excel file on the disk
FileInfo file = new FileInfo(Server.MapPath(""~/Content/input.xlsx"));
//create a new Excel package from the file
using (ExcelPackage package = new ExcelPackage(file))
{
//create an instance of the the first sheet in the loaded file
ExcelWorksheet worksheet = package.Workbook.Worksheets[1];
//Add programmatic picture
worksheet.Drawings
.AddPicture("logo", new FileInfo(Server.MapPath("~/Content/logo.png")))
.SetPosition(5, 0, 5, 0);
//get the new size in byte array
byte[] output = package.GetAsByteArray();
}