Exception when open excel: File contains corrupted data - excel

Question

I am trying to read an excel with OpenXML.
What I did is simply as following:
private WorkbookPart wbPart = null;
private SpreadsheetDocument document = null;
public byte[] GetExcelReport()
{
byte[] original = File.ReadAllBytes(this.originalFilename);
using (MemoryStream stream = new MemoryStream())
{
stream.Write(original, 0, original.Length);
using (SpreadsheetDocument excel = SpreadsheetDocument.Open(stream, true))
{
this.document = excel;
this.wbPart = document.WorkbookPart;
UpdateValue();
}
stream.Seek(0, SeekOrigin.Begin);
byte[] data = stream.ToArray();
return data;
}
}
I initialized this.originalFilename in the constructor. It is the filename ended with '.xlsx' which i created with excel 2010.
But this line of code
using (SpreadsheetDocument excel = SpreadsheetDocument.Open(stream, true))
gives the exception: Message: System.IO.FileFormatException: File contains corrupted data.
The StackTrace:
Does anyone know how to solve this problem? At the beginning, I didn't use the Stream, I just use SpreadsheetDocument.Open(filename, true). However, it turns out to be exactly the same exception.
I've tried to create a new .xlsx file, but it's still the same.

Answer 1

There is a MSDN page which describes the process of reading and writing Excel file using stream and open xml SDK.
http://msdn.microsoft.com/en-us/library/office/ff478410.aspx
Try extracting the document contents through zip application and check whether you are getting the standard folders inside like xl,docProps and _rels etc.,
This is a method to find whether the package is properly packaged as archive or not.
Hope this helps.