C# - Cannot access a closed stream

Question

My code for PDF creation with iTextSharp version 5.5.13.2 is returning error, "Cannot access a closed stream." I am unsure how this error could arise as I have my code encapsulated within reaches of Using statement. Debugging results in app going to break state. PdfWriter writer = PdfWriter.GetInstance(doc, ms);

Answer 1

Looking at the source code for the (deprecated) iTextSharp 5.5.13.2 here, I can find the source for the DocWriter (base class of PdfWriter) and it's Close method here

public virtual void Close() {
    open = false;
    os.Flush();
    if (closeStream)
        os.Close();
}

os in this case is whatever was passed as the second argument to PdfWriter.GetInstance (ms in your case). Using Ctrl + F I can find the source for closeStream, which happens to be a property exposes as CloseStream here

public virtual bool CloseStream {
    get {
        return closeStream;
    }
    set {
        closeStream = value;
    }
}

And all together Close is automatically called by the Dispose method of DocWriter

public virtual void Dispose() {
    Close();
}

So, if you don't want the PdfWriter to close your ms, you'll need to set writer.CloseStream = false; before your PdfWriter gets closed