Can .NET AppDomains do this?

Question

I read about AppDomains for many hours, but I'm not sure if they work the way I hope.

If I have two classes, common Foo <T> in AppDomain # 1, Bar in AppDomain # 2:

Appendix No. 1 is an application. App Domain # 2 is something like a plugin, and it can be loaded and unloaded dynamically.

AppDomain # 2 wants to create a Foo <Bar> and use it. Foo <T> uses many classes in AppDomain # 1 internally.

I don't want AppDomain # 2 to use a foo object with reflection, I want it to use Foo <Bar> foo, with all the static typing and compiled speed that comes with it. Can this be done, given that AppDomain # 1 containing Foo <T> is never unloaded?

If so, is there any deletion when using Foo <Bar>?

When I unload AppDomain # 2, is the Foo <Bar> type destroyed?

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Answer 1

You mix types and objects in your question, which makes the answer difficult. The code in AD does not cause problems using types that are also used in other ADs; it just loads the assembly. But AD has its own garbage heap; you cannot directly reference objects that live in another AD. They must be serialized along the AD boundary. Yes, Remoting through IpcChannel will do this.

Answer 2

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using System;
using System.Reflection;

namespace TestAppDomain
{
class Program
{
    static void Main(string[] args)
    {
        AppDomain pluginsAppDomain = AppDomain.CreateDomain("Plugins");

        Foo foo = new Foo();
        pluginsAppDomain.SetData("Foo", foo);

        Bar bar= (Bar) pluginsAppDomain.CreateInstanceAndUnwrap(Assembly.GetEntryAssembly().FullName, typeof (Bar).FullName);
        bar.UseIt();

        AppDomain.Unload(pluginsAppDomain);
        foo.SaySomething();
    }
}

class Bar : MarshalByRefObject
{
    public void UseIt()
    {
        Console.WriteLine("Current AppDomain: {0}", AppDomain.CurrentDomain.FriendlyName);
        Foo foo = (Foo) AppDomain.CurrentDomain.GetData("Foo");
        foo.SaySomething();
    }
}

class Foo : MarshalByRefObject
{
    public void SaySomething()
    {
        Console.WriteLine("Something from AppDomain: {0}", AppDomain.CurrentDomain.FriendlyName);
    }
}
}

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