.Net 之不同AppDomin之间通讯

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Reflection;
using System.Runtime.Remoting;

namespace Marshal
{
    class Program
    {
        static void Main(string[] args)
        {
            // 获取一个指向应用程序域的引用
            AppDomain adCallingThreadDomain = Thread.GetDomain();
            // 每一个应用程序域都会被分配一个名字帮助调试 ,以下代码获取引用程序域的名字
            String callingDomainName = adCallingThreadDomain.FriendlyName;
            // 获取应用程序域的完整名
            String exeAssembly = Assembly.GetEntryAssembly().FullName;
            AppDomain ad2 = null;

            // ************************************************************************************************************
            // 使用Marshal-by-Reference的方式跨域通信
            Console.WriteLine("{0}Demo #1", Environment.NewLine);
            // 建立一个域,安全和配置均使用当前域的设置
            ad2 = AppDomain.CreateDomain("AD #2", null, null);
            MarshalByRefType mbrt = null;
            // 加载Assembly到新的域,new一个对象并且返回到当前域 (实际上返回的是一个引用代理) 
            mbrt = (MarshalByRefType)ad2.CreateInstanceAndUnwrap(exeAssembly, "Marshal.MarshalByRefType");
            Console.WriteLine("Type={0}", mbrt.GetType()); // CLR 对GetType做了一些手脚,返回的是被代理数据的真实类型
            // 以下代码证明我们获取的是一个代理对象
            Console.WriteLine("Is proxy={0}", RemotingServices.IsTransparentProxy(mbrt));
            // 我们调用了代理类的SomeMethod() , 代理类跨域访问真正的对象
            mbrt.SomeMethod();
            // 卸载新建的那个应用程序域
            AppDomain.Unload(ad2);
            // mbrt refers to a valid proxy object; the proxy object refers to an invalid AppDomain
            try
            {
                // 再次调用代理类的SomeMethod() , 由于域已经被卸载 抛出一个异常
                mbrt.SomeMethod();
                Console.WriteLine("Successful call.");
            }
            catch (AppDomainUnloadedException)
            {
                Console.WriteLine("Failed call.");
            }

            // ************************************************************************************************************
            // 使用Marshal-by-Value 的方式跨域通信
            Console.WriteLine("{0}Demo #2", Environment.NewLine);
            // 新建域
            ad2 = AppDomain.CreateDomain("AD #2", null, null);
            // 加载程序集并创建代理类
            mbrt = (MarshalByRefType)ad2.CreateInstanceAndUnwrap(exeAssembly, "Marshal.MarshalByRefType");
            // 该方法返回了一个值的拷贝 marshaled by value (not be reference).
            MarshalByValType mbvt = mbrt.MethodWithReturn();
            // 证明返回值不是一个代理类
            Console.WriteLine("Is proxy={0}", RemotingServices.IsTransparentProxy(mbvt));
            // 查看返回值是谁创建的
            Console.WriteLine("Returned object created " + mbvt.ToString());
            // 卸载应用程序域
            AppDomain.Unload(ad2);
            // 由于是值传递,那么卸载域对函数没有影响 // marshaled by value 
            try
            {
                //不会有异常抛出
                Console.WriteLine("Returned object created " + mbvt.ToString());
                Console.WriteLine("Successful call.");
            }
            catch (AppDomainUnloadedException)
            {
                Console.WriteLine("Failed call.");
            }
            // ************************************************************************************************************
            // non-marshalable type 跨域通信
            Console.WriteLine("{0}Demo #3", Environment.NewLine);
            ad2 = AppDomain.CreateDomain("AD #2", null, null);
            mbrt = (MarshalByRefType)ad2.CreateInstanceAndUnwrap(exeAssembly, "TestConsole.MarshalByRefType");
            // 没有标记为 Serializable 的类型对象 不能通过marshaled by value 跨域通信
            NonMarshalableType nmt = mbrt.MethodArgAndReturn(callingDomainName);


        }
    }

    //即使没有标记为Serializable 也可以通过 marshaled-by-reference 的方式跨域通信
    public sealed class MarshalByRefType : MarshalByRefObject
    {
        public MarshalByRefType()
        {
            Console.WriteLine("{0} ctor running in {1}",
            this.GetType().ToString(), Thread.GetDomain().FriendlyName);
        }
        public void SomeMethod()
        {
            Console.WriteLine("Executing in " + Thread.GetDomain().FriendlyName);
        }
        public MarshalByValType MethodWithReturn()
        {
            Console.WriteLine("Executing in " + Thread.GetDomain().FriendlyName);
            MarshalByValType t = new MarshalByValType();
            return t;
        }
        public NonMarshalableType MethodArgAndReturn(String callingDomainName)
        {
            // NOTE: callingDomainName is [Serializable]
            Console.WriteLine("Calling from ‘{0}’ to ‘{1}’.",
            callingDomainName, Thread.GetDomain().FriendlyName);
            NonMarshalableType t = new NonMarshalableType();
            return t;
        }
    }

    //只有标记为 Serializable 的类型 才能用marshaled by value 的方式跨域通信
    [Serializable]
    public sealed class MarshalByValType : Object  
    {
        private DateTime m_creationTime = DateTime.Now; // NOTE: DateTime is [Serializable]
        public MarshalByValType()
        {
            Console.WriteLine("{0} ctor running in {1}, Created on {2:D}",
            this.GetType().ToString(),
            Thread.GetDomain().FriendlyName,
            m_creationTime);
        }
        public override String ToString()
        {

 		 return m_creationTime.ToLongDateString();
        }
    }

    // 没有标记为 Serializable 的类型 不能用marshaled by value 的方式跨域通信
    // [Serializable]
    public sealed class NonMarshalableType : Object
    {
        public NonMarshalableType()
        {
            Console.WriteLine("Executing in " + Thread.GetDomain().FriendlyName);
        }
    }

}

显示结果为: