Asp.net Core导入Excel文件FileNotFoundException

Question

I've had this working but it has stopped and I can't figure out why. I'm importing a simple excel file, using EPPlus.Core v1.3. Here's the code I'm using:

public async Task<IActionResult> Import(IFormFile file)
    {
        //Get file
        var newfile = new FileInfo(file.FileName);
        var fileExtension = newfile.Extension;

        //Check if file is an Excel File
        if (fileExtension.Contains(".xls"))
        {
            //Create an excel package
            using (var package = new ExcelPackage(newfile))
            {
                //Get the first worksheet in the file
                var worksheet = package.Workbook.Worksheets[1];
...

The var worksheet line throws an error

"IndexOutOfRangeException: Worksheet position out of range."

However, when I look at the package variable I see this error

"Length = 'package.File.Length' threw an exception of type 'System.IO.FileNotFoundException'"

What am I missing here? Like I said, this used to work and I can't think of anything I changed related to this code to cause this issue.

Answer 1

Is it the same file also? It looks like the file might not have two worksheets and since the index is 1, it is looking for the second worksheet.

Answer 2

You need to load the file in a MemoryStream and create a ExcelPackage from there.

using (MemoryStream ms = new MemoryStream(FileUpload1.FileBytes))
using (ExcelPackage excelPackage = new ExcelPackage(ms))
{
    //work with the excel document
}

FileUpload1.FileBytes if for asp.net webforms, but I'm guessing Core has something similar.