Why are .docx files being corrupted when downloading from an ASP.NET page?

Question

I have this following code for bringing page attachments to the user:

private void GetFile(string package, string filename)
{
    var stream = new MemoryStre         


        

Answer 1

For what it's worth, I also ran into the same problem listed here. For me the issue was actually with the upload code not the download code:

    Public Sub ImportStream(FileStream As Stream)
        'Use this method with FileUpload.PostedFile.InputStream as a parameter, for example.
        Dim arrBuffer(FileStream.Length) As Byte
        FileStream.Seek(0, SeekOrigin.Begin)
        FileStream.Read(arrBuffer, 0, FileStream.Length)
        Me.FileImage = arrBuffer
    End Sub

In this example the problem is I declare the Byte array arrBuffer with a size one byte too large. This null byte is then saved with the file image to the DB and reproduced on download. The corrected code would be:

        Dim arrBuffer(FileStream.Length - 1) As Byte

Also for reference my HttpResponse code is as follows:

                context.Response.Clear()
                context.Response.ClearHeaders()
                'SetContentType() is a function which looks up the correct mime type
                'and also adds and informational header about the lookup process...
                context.Response.ContentType = SetContentType(objPostedFile.FileName, context.Response)
                context.Response.AddHeader("content-disposition", "attachment;filename=" & HttpUtility.UrlPathEncode(objPostedFile.FileName))
                'For reference: Public Property FileImage As Byte()
                context.Response.BinaryWrite(objPostedFile.FileImage)
                context.Response.Flush()

Answer 2

It all looks ok. My only idea is to try calling Dispose on your stream after calling Response.Flush instead of before, just in case the bytes aren't entirely written before flushing.