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I'm trying to some excel processing using excel interop and later to be displayed in winform. My source of data is from memorystream.

Why excel interop? So that later i can display it in winform using edraw office viewer.

After searching the internet for days on loading excel workbook and worksheet from memorystream, i found that i can use epplus to do so. The link is from[^]

If my understanding is correct, epplus is office open xml and not excel interop. How do i convert epplus workbook type to excel interop's workbook type so that i can do excel processing?

Of course the easier way would be just load excel interop's workbook from memorystream, but i do not know how to do it. Can somebody please help me? Thanks.

Btw, i'm using .net 4.0 and my memorystream is from excel 2007.
Updated 29-Jun-20 21:38pm
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Solution 1

Why don't you just save content of your memory stream into temporary file and process that file normally with Excel application?
See my example code:
// Get content of your Excel file
var ms = new MemoryStream(...);

// Get temp file name
var temp = Path.GetTempPath(); // Get %TEMP% path
var file = Path.GetFileNameWithoutExtension(Path.GetRandomFileName()); // Get random file name without extension
var path = Path.Combine(temp, file + ".xlsx"); // Get random file path

using (var fs = new FileStream(path, FileMode.Create, FileAccess.Write))
    // Write content of your memory stream into file stream

// Create Excel app
Excel.Application excel = new Excel.Application();

// Open Workbook
excel.Workbooks.Open(path, ReadOnly: true);
JoJo82 21-Jul-13 3:48am
I did thought of that. However, due to the sensitivity of the information contained in the memorystream, i prefer not to save it to file if possible.
Matej Hlatky 21-Jul-13 4:05am
Instead of TEMP folder you can use your own working folder, such as C:\top-secret with properly set security permissions.
After you process your file, rewrite its content with randomly generated bytes and delete it.
JoJo82 21-Jul-13 4:12am
That looks promising. Am still trying to understand tho.
What kind of permission is that? How do I set it programmatically?
Can you explain more, maybe some sample code if possible so that I can better understand it and know how to apply it.
Matej Hlatky 21-Jul-13 6:08am
Hi, unfortunately I have no experience with this kind of scenario... this was only basic idea.
Just check the Directory.CreateDirectory Method (String, DirectorySecurity).
Member 12080968 29-May-17 5:41am
maybe need this link
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Solution 3

Instead of using
better use of

using (var tempfile = new TempFileCollection())
    string filePath = tempfile.AddExtension("temp"); // or whatever you want to use
    using (FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate))
        fs.Write(YourByteArray, 0, YourByteArray.Length);
    // Here is your code of what you want to do with this file, fill it, print it, or whatever
// Here the file is deleted automatically

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