Microsoft opensourced a cross platform official implementation of .NET called CoreCLR - and altough slightly young you can do what you just said and they suppor

Microsoft opensourced a cross platform official implementation of .NET called CoreCLR - and altough slightly young you can do what you just said and they support it trough Azure on linux and offer OSX builds. Also Mono took better parts of CoreCLR and made their implementation better. Also Microsoft acquired the company behind mono/Xamarin and given their recent trend will just fold that work in to their OSS offerings (at least partially) So please get your facts straight before commenting on the issue because that's sort of the problen I'm getting at in my post.