问题 LoaderOptimizationAttribute的影响

我编写了一小段关于动态加载程序集和从这些程序集创建类实例的代码，包括可执行文件，要动态加载的测试库和用于将动态程序集加载到新程序集的加载程序库 Appdomain。 Loader库由可执行文件和动态库引用。

//executable
[System.STAThreadAttribute()]
[System.LoaderOptimization(LoaderOptimization.MultiDomain)]
static void Main(string[] args)
{       
    AppDomainSetup domainSetup = new AppDomainSetup()
    {
        ApplicationBase = AppDomain.CurrentDomain.SetupInformation.ApplicationBase,
        ConfigurationFile = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile,
        ApplicationName = AppDomain.CurrentDomain.SetupInformation.ApplicationName,
        LoaderOptimization = LoaderOptimization.MultiDomain
    };
    AppDomain childDomain = AppDomain.CreateDomain("MyDomain", null, domainSetup);
    Console.WriteLine(AppDomain.CurrentDomain.SetupInformation.LoaderOptimization.ToString());
    Console.WriteLine(childDomain.SetupInformation.LoaderOptimization.ToString());

    byte[] assembly = null;
    string assemblyName = "CSTestLib"; 

    using (FileStream fs = new FileStream(assemblyName+".dll",FileMode.Open))
    {
        byte[] byt = new byte[fs.Length];
        fs.Read(byt,0,(int)fs.Length);
        assembly = byt;          
    }

    object[] pararmeters = {assemblyName,assembly}; 
    string LoaderAssemblyName = typeof(AssemblyLoader).Assembly.FullName;
    string LoaderClassName = typeof(AssemblyLoader).FullName;
    AssemblyLoader assloader = (AssemblyLoader)childDomain.CreateInstanceAndUnwrap(LoaderAssemblyName,LoaderClassName , true, BindingFlags.CreateInstance, null, parameters, null, null);


    object obj = assloader.Load("CSTestLib.Class1");
    object obj2 = assloader.Load("CSTestLib.Class2");

    AppDomain.Unload(childDomain);

    Console.ReadKey();
}

//Dynamic Lib
using System;


namespace CSTestLib
{
    public class Class1 :MarshalByRefObject
    {
        public Class1() { }
    }



    public class Class2 : MarshalByRefObject
    {
        public Class2() { }
    }
}

//Loader Library


using System;

namespace LoaderLibrary
{
    public class AssemblyLoader : MarshalByRefObject
    {
        string assemblyName;
        public AssemblyLoader(string assName, byte[] ass)
        {
            assemblyName = assName;
            AppDomain.CurrentDomain.Load(ass);
            Console.WriteLine(AppDomain.CurrentDomain.FriendlyName + " " + AppDomain.CurrentDomain.SetupInformation.LoaderOptimization.ToString());
        }

        public object Load(string className)
        {
            object ret = null;
            try
            {
                ret = AppDomain.CurrentDomain.CreateInstanceAndUnwrap(assemblyName, className);
            }
            catch (System.Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            return ret;
        }
    }
}

1. 我在这里设定 LoaderOptimizationAttribute 上 main() 方法但是 AppDomain.CurrentDomain.SetupInformation.LoaderOptimization.ToString(); 说它是 NotSpecified 为什么？

2. 之间的区别 MultiDomain 和 MultiDomainHost 我不太清楚。是 MultiDomainHost 仅适用于GAC组件？对于我的情况哪个更合适？

3. 根据 这个 

   无法共享JIT编译的代码   装配到装载中的装配   上下文，使用LoadFrom方法   Assembly类，或从中加载   使用Load的重载的图像   指定字节数组的方法。

那么如何检测程序集是否加载域中性？怎么能保证我加载域中立？