Displaying byte array of PDF file to winforms?

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I'm trying to load byte array of pdf from MySQL database to my winforms application using this third library called "Apitron.PDF.Controls" but to no avail.

if(_readBytes.Read()) { 
                var getPdfValues = (byte[])_readBytes["PDF_BYTES"];
                String base64 = Convert.ToBase64String(getPdfValues);

                FileStream _FileStream = new FileStream(base64,FileMode.Open);
                pdfViewer1.Document = new Document(_FileStream);
            }
            _readBytes.Close();

The screen throws an exception "The specified path, file anme or both are too long. The fully qualified file name must be less than 260 characters ..."

What I have tried:

This is how the byte array was sent to the DB

Byte[] readPdfBytes = File.ReadAllBytes(open.FileName);

Posted 5-Dec-22 2:43am

Dan Sep2022

Updated 5-Dec-22 3:02am

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BillWoodruff 6-Dec-22 6:32am

look for support or information from "Apitron.PDF.Controls."

how do you know a byte array contains intelligible text ?

Dan Sep2022 6-Dec-22 6:33am

I just re-read my own code and apparently I was wrong thinking the byte array was a file path.

BillWoodruff 6-Dec-22 6:53am

everyone here learns through mistakes, and incorrect assumptions. :) cheers, bill

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Chris Copeland · Accepted Answer · 2022-12-05T03:02:00

The first parameter of FileStream is a path to a file on the file system; not a base64-encoded string. If you already have the byte array for the file then you don't need to use a FileStream, but you could instead use a MemoryStream Class (System.IO) | Microsoft Learn[^]

Simple creating the MemoryStream instance, write the byte array, reset the position back to the beginning and pass it into the Document constructor. If the Document constructor does not take a Stream class then you might need to come up with a work-around.