FileUpload to FileStream
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 along with HttpWebRequest. How do I convert the FileUpload to a filestream?
Solution 1:
Since FileUpload.PostedFile.InputStream gives me Stream, I used the following code to convert it to byte array
public static byte[] ReadFully(Stream input)
{
byte[] buffer = new byte[input.Length];
//byte[] buffer = new byte[16 * 1024];
using (MemoryStream ms = new MemoryStream())
{
int read;
while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
{
ms.Write(buffer, 0, read);
}
return ms.ToArray();
}
}
Solution 2:
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.