Question

In my previous question, someone has commented that write a .NET Stream to two another Streams simultaneously is possible. I only could find one way but using a temporary variable (buffer) that would store the contents (fully or partialy at once) of the input Stream.

1. There is any way to do that without using buffers?
2. There is any way to do it concurrently?

Answer 1

Using a buffer you can asynchronously write to both streams, assuming the streams support proper asynchronous access. That’s effectively concurrent – although you’ll have a tricky job keeping all the buffers in sync given that one could finish writing the first buffer a long time before the other has done so.

As far as I’m aware there’s no way to copy from one (general) stream to another without using a buffer of at least one byte. (And using just a single byte will be painfully inefficient, of course.)