No AppDomains in .NET Core! Why?

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The point of the .NETCore subset was to keep a .NET install small. And easy to port. Which is why you can, say, run a Silverlight app on both Windows and OSX and not wait very long when you visit the web page. Downloading and installing the complete runtime and framework takes a handful of seconds, give or take.

Keeping it small inevitably requires features to be cut. Remoting was very high on that list, it is quite expensive. Otherwise well hidden, but you can for example see that delegates no longer have a functional BeginInvoke() method. Which put AppDomain on the cut list as well, you can’t run code in an app domain without remoting support. So this is entirely by design.

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