Getting "Cannot access a closed file" errormessage when getting file from session

Question

I have a asp.net FileUpload control. I can successfully upload file to store in session, but when I am tring to get its inputstream (I'm store file in HttpPosterFile) I'm getting error

Cannot access a closed file

tr.PostedFile //<== HttpPostedFile; 
byte[] byteArray = null; 
using (var binaryReader = new BinaryReader(tr.PostedFile.InputStream)) 
{ 
    byteArray = binaryReader.ReadBytes(tr.PostedFile.ContentLength); 
}

Larrikin

Would it not be better to just store the byte array of file data in session rather than the HttpPostedFile with the stream? – Nucleonics

Answer 1

add this to your web.config file

<system.web>
  <httpRuntime useFullyQualifiedRedirectUrl="true" maxRequestLength="15360" requestLengthDiskThreshold="15360"/>
</system.web>

http://sanjaysainitech.blogspot.com/2008/12/file-upload-error-can-not-access-closed.html

Frequency

Setting the RequestLengthDiskThreshold (to anything, up to MaxRequestSize) in web.config resolves the problem. Apparently ASP.Net buffers the first chunk of the input stream, then treats the stream as closed. This can happen if you set MaxRequestLength (say, 1536) but let RequestLengthDiskThreshold default. This apparently trips over some internal code, which makes it a Microsoft bug. Setting both values resolves the problem. – Electrothermics

Is this can to be implement in net core? – Halfwitted

Answer 2

Did you use using?

If yes pay attention to not close this before you put the string to the inputstream.

Incommunicative

tr.PostedFile <== HttpPostedFile; byte[] byteArray = null; using (var binaryReader = new BinaryReader(tr.PostedFile.InputStream)) { byteArray = binaryReader.ReadBytes(tr.PostedFile.ContentLength); } ; That's my code – Larrikin