FileUpload to FileStream

Question

I am in process of sending the file along with HttpWebRequest. My file will be from FileUpload UI. Here I need to convert the File Upload to filestream to send the stream al

Answer 1

Might be better to pipe the input stream directly to the output stream:

inputStream.CopyTo(outputStream);

This way, you are not caching the entire file in memory before re-transmission. For example, here is how you would write it to a FileStream:

FileUpload fu;  // Get the FileUpload object.
using (FileStream fs = File.OpenWrite("file.dat"))
{
    fu.PostedFile.InputStream.CopyTo(fs);
    fs.Flush();
}

If you wanted to write it directly to another web request, you could do the following:

FileUpload fu; // Get the FileUpload object for the current connection here.
HttpWebRequest hr;  // Set up your outgoing connection here.
using (Stream s = hr.GetRequestStream())
{
    fu.PostedFile.InputStream.CopyTo(s);
    s.Flush();
}

That will be more efficient, as you will be directly streaming the input file to the destination host, without first caching in memory or on disk.