[Mono-dev] Mono and vNext, What is microsoft supporting

Martin Thwaites monoforum at my2cents.co.uk
Wed Nov 5 11:43:16 UTC 2014

So, after thinking about this further.  The question I have is not really
about CoreCLR.

What I want to know is, the libraries that Microsoft are making available
via their nuget (myget at the moment), are these going to be tested again
.net, mono and CoreCLR? I.e will the libraries be cross platform?

 I just asked about CoreCLR on Linux during today's ASP.NET vNext community
standup and the answer was:
"CoreCLR runs on Windows. On Linux you use Mono." (

That should clarify it pretty much :)

-- Alex

> From: alex.koeplinger at outlook.com
> To: monoforum at my2cents.co.uk; mono-devel-list at lists.ximian.com
> Date: Sat, 25 Oct 2014 21:52:59 +0200
> Subject: Re: [Mono-dev] Mono and vNext, What is microsoft supporting
> Note: the following is based on discussions with David Fowler (one of the
MS devs) et.al. in JabbR and other places. I'm not part of MS/vNext team or
Xamarin, so I may be totally wrong :)
> >> "CoreCLR is intended to be Windows-only too from what I've heard, as
it doesn't make much sense for Mono (you can already do side-by-side
deployment of Mono)."
> > Where have you seen this, do you have a link you can send? This is a
major missing piece of the puzzle for me. I've been hoping that with vNext,
applications would be truely cross platform, but it seems we are still very
much reliant on Mono's class implementations.
> > I've read an article[1] that says the CoreCLR ("Cloud Optimized") is to
be "Cross Platform". If that is the case, and there are no plans to make a
linux compatible version and just use mono, they could easily say the same
about the .NET 4.5 class libraries as they are available in mono.
> You should keep in mind that CoreCLR is just that - another runtime
implementation (they based this off of the old Silverlight runtime which
was side-by-side deployable). What they now put on top is the class
libraries distributed via NuGet, resulting in this self-contained
experience. As I said, it's just one of the options alongside .NET CLR and
Mono CLR, like this picture from your article shows:
(the article never says the CoreCLR is cross-platform, just the vNext
application itself)
> > So either, when Microsoft refer to "Cross platform", they are only
referring to applications that rely on no class libraries and only corlib
(is that a thing can an application be purely reliant on no class
libraries?). Alternatively, they are relying on Mono to create a CoreCLR (I
wouldn't be surprised if they've ask for Xamarin's help in doing that).
> The end result should be that you can run your app on .NET, CoreCLR and
Mono and the app doesn't care. The problem with the web frameworks like MVC
etc. up until now was that they were tightly coupled to System.Web, which
is not open-source and very difficult to reimplement in Mono (and to be
honest likely also lagged behind because Xamarin's focus is on mobile). The
new vNext stacks don't rely on System.Web anymore and just use the basic
class libraries that are well implemented on Mono too (like corlib,
System.Net etc. as they're important to Xamarin). It should be a much much
better experience given that Microsoft actively tests the vNext stack on
Mono. Now if **your** application code relies on something that isn't
implemented on Mono then that's a problem, sure.
> > I am aware that you can side-by-side in mono, however, I thought that
one of the other big benefits of vNext was the reduction in footprint,
specifically around the memory footprint per request. So you can opt-in/out
of specific features.
> Maybe they'll make this whole CoreCLR/small-footprint - experience
available on other OSs as well, but from what I've heard this is targeted
at Windows for now.
> -- Alex
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