Changed SaveAs[Async](string) to CopyTo[Async](Stream)

[khellang]

#527

[davidfowl]

Shouldn't we be disposing our stream? If we don't who does?

[khellang]

Yeah, I've seen it being disposed other places...

[muratg]

@Tratcher Could you have a look?

[Tratcher]

@lodejard @davidfowl What's the point of having IFormFile.CopyTo(Stream) when you already have IFormFile.OpenReadStream().CopyTo(Stream)?

Should we just remove SaveAs(string)?

[khellang]

What's the point of having IFormFile.CopyTo(Stream) when you already have IFormFile.OpenReadStream().CopyTo(Stream)?

Good point 😝👍

[Tratcher]

Hmm I guess it would actually be something like:

IFormFile.CopyTo(Stream output)
{
 using (var readStream = OpenReadStream())
 {
  reasStream.CopyTo(output);
 }
}

This might be worth it if it was actually important to dispose the readStream, but so far it isn't.

[Tratcher]

Rebased and merged.