Error: Cannot access a closed file when converting imagefile into bytes

Question

Whenever converting the imagefile into bytes we got an error like

cannot access a closed file

Please help me in order to overcome this

private byte[] ConvertToBytes(HttpPostedFileBase file)
{
    byte[] imageBytes = null;
    BinaryReader reader = new BinaryReader(file.InputStream);

    imageBytes = reader.ReadBytes((int)file.ContentLength);

    return imageBytes;
}

https://stackoverflow.com/questions/16030034/asp-net-mvc-read-file-from-httppostedfilebase-without-save — Dmitry Bychenko, Aug 17 '18 at 14:05
Which line do you get this error on? `BinaryReader reader = new BinaryReader(file.InputStream);`? — ivcubr, Aug 17 '18 at 15:49
imageBytes = reader.ReadBytes((int)file.ContentLength); in this line i got error. — Devaraneni Laxman Rao, Aug 18 '18 at 04:32
In another related question (https://stackoverflow.com/a/13805858/1689226) there has been comments to try to set the `Position` of the `InputStream` object. You can try that. — Subbu, Aug 18 '18 at 06:15

score 1 · Answer 1 · answered Sep 03 '18 at 05:35

1

Use a BinaryReader object to return a byte array from the stream like:

byte[] fileData = null;
var binaryReader = new BinaryReader(Request.Files[0].InputStream);
fileData = binaryReader.ReadBytes(Request.Files[0].ContentLength);

answered Sep 03 '18 at 05:35

John H

21
3

score 0 · Answer 2 · edited Sep 03 '18 at 05:46

In case it can help:

try
{
    using (var bitmap = new System.Drawing.Bitmap(file.InputStream))
    {
        using (var memoryStream = new MemoryStream())
        {
             bitmap.Save(memoryStream, System.Drawing.Imaging.ImageFormat.Jpeg);
             return memoryStream.ToArray();
        }
    }
}
catch (Exception)
{
    return null;
}
finally
{
    postedFile.InputStream.Position = 0;
}

Error: Cannot access a closed file when converting imagefile into bytes

2 Answers2