Copy stream content on two destinations

Question

I know it's possible to copy one stream to another with sourceStream.CopyTo(targetStream); but I want to copy content of sourceStream to two destination streams in two different Tasks. When I call this method two times, in second time stream is empty.

Is that possible at all? A simple way is to load stream content to memory then copy it on targets, but it may cause OutOfMemoryException.

If it matters I'm using .Net 4.5

Answer 1

If you're copying it to two destinations at the same time, then something like:

byte[] buffer = new byte[SOME_SIZE];

int bytesRead;
while((bytesRead = source.Read(buffer, 0, buffer.Length)) > 0)
{
    dest1.Write(buffer, 0, bytesRead);
    dest2.Write(buffer, 0, bytesRead);
}

This iterates through the input stream once, writing each chunk to two outputs. This is pretty much what CopyTo does internally - the only difference is the second output.