如何从另一个的AppDomain调用类的方法

我的应用程序想要调用一类，它是从另一个AppDomain中的方法。

my application want to call a method of a class that is from another AppDomain.

       AppDomain env = AppDomain.CreateDomain(
            "test",
            null,
            new AppDomainSetup() { ApplicationName = "test" }
            );

        Assembly a = Assembly.LoadFrom("d:\\testenv1\\test2.dll");
        //env.AssemblyResolve += new ResolveEventHandler(env_AssemblyResolve);
        env.Load(a.FullName);

        ObjectHandle o = env.CreateInstance(a.FullName, "Test2.Class1");

现在我有Test2.Class1的对象句柄，但我不知道如何invode Class1类的动作的方法。

now i have the object handle of the Test2.Class1, but i have no idea how to invode the "action" method of the Class1 class.

动作的方法很喜欢这样的：

the "action" method likes this:

    public void action()
    {
        Console.WriteLine(AppDomain.CurrentDomain.FriendlyName + " ok");
    }

我试图用o.unwrap（）方法来获取对象的引用，但似乎对象已经转移到当前域中，因此，行动方法的输出显示当前域名。

i tried to use o.unwrap() method to get the reference of the object, but it seems the object has been transferred into the current domain, so the output of the "action" method prints the current domain name.

谢谢， 大卫