System.AppDomain (class)

System.AppDomain represents an application domain, that is an an isolated environment where applications execute.

System.AppDomain derives from System.MarshalByRefObject

An application domain is typically created by a runtime host.

An instance of AppDomain is able to respond to the following events

• an assembly is loaded
• an application domain will be unloaded
• an unhandled exception is thrown.

Apparently, on .NET Core, there is exactly one AppDomain (whatever that means).

For each new AppDomain, a default System.Runtime.Remoting.Messaging.CallContext is created.