Error: Parameter is not valid. Converting byte array to image with Image.FromStream

Question

    private bool IsValidImage(byte[] bytes)
    {
        try
        {
            using (MemoryStream ms = new MemoryStream(bytes))
                Image.FromStream(ms, true, true);
        }
        catch (ArgumentException)
        {
            return false;
        }
        return true;
    }

Can someone tell me what I'm doing wrong? This works fine when the actual byte array is an image. But when I pass in another type of file, like docx or xlsx then I get runtime error of "Parameter is not valid" on FromStream. The exception doesn't get caught in the catch block either. If the FromStream throws an ArgumentException, it should get caught in the catch block, right?

try debugging your code and check whether you are getting values or not — HEEN
– HEEN, Commented Apr 7, 2015 at 13:46

Fischermaen · Accepted Answer · 2015-04-07 13:30:11Z

1

An image can only be created from an image stored in the memory stream. If you store e.g. a ".docx"-File there, the image cannot be created from that.

answered Apr 7, 2015 at 13:30

Fischermaen

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1 Comment

gooseman Over a year ago

So shouldn't the exception be caught in my catch block? How do I achieve what I'm trying to do? I don't know ahead of time if the byte array is going to be an image or not.

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