Webcast.NET Remoting学习笔记（4）按值列集和按引用列集

前面的笔记也谈到了这个问题,但没有例子来说明一下,所以今天把webcast的例子给大家作为例子演示一下他们的不同:
类库项目中包含两个文件: class1.cs和 helloserver.cs ,代码如下:
class1.cs

using System;
using System.Collections.Generic;
using System.Text;

namespace RemotingSamples
{
       [Serializable]
    public class MySerialized 
    {
        public MySerialized(int val)
        {
            a = val;
        }
        public void Foo()
        {
            Console.WriteLine("MySerialized.Foo called");
        }
        public int A
        {
            get
            {
                Console.WriteLine("MySerialized.A called");
                return a;
            }
            set
            {
                a = value;
            }
        }
        protected int a;
    }
    public class MyRemote : System.MarshalByRefObject
    {
        public MyRemote(int val)
        {
            a = val;
        }
        ~MyRemote()
        {
            Console.WriteLine("MyRemote destructor");
        }
        public void Foo()
        {
            Console.WriteLine("MyRemote.Foo called");
        }
        public int A
        {
            get
            {
                Console.WriteLine("MyRemote.A called");
                return a;
            }
            set
            {
                a = value;
            }
        }
        protected int a;
    }
}

可以看到有两个类一个是MySerialized 前面有[Serializable]所以它是可序列化的,可以按值列集,另一个是MyRemote继承自System.MarshalByRefObject,可以按引用列集.
helloserver.cs

using System;
using System.Collections.Generic;
using System.Text;

namespace RemotingSamples
{
    public class HelloServer : MarshalByRefObject
    {
        public HelloServer()
        {
            Console.WriteLine("HelloServer activated");
        }
        public String HelloMethod(String name)
        {
            Console.WriteLine(
                "Server Hello.HelloMethod : {0}", name);
            return "Hi there " + name;
        }
        public MySerialized GetMySerialized()
        {
            return new MySerialized(4711);
        }

        public MyRemote GetMyRemote()
        {
            return new MyRemote(4712);
        }
    }
}

还有server和client两个控制台应用程序
server.cs

using System;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;
using System.Runtime.Remoting.Channels.Http;

namespace RemotingSamples 
{

    public class Server
    {
        public static int Main(string [] args) 
        {

            TcpChannel chan1 = new TcpChannel(8085);
            HttpChannel chan2 = new HttpChannel(8086);

            ChannelServices.RegisterChannel(chan1);
            ChannelServices.RegisterChannel(chan2);


            RemotingConfiguration.RegisterWellKnownServiceType
                (
                typeof(HelloServer),
                "SayHello",
                WellKnownObjectMode.SingleCall
                );
            

            System.Console.WriteLine("Press Enter key to exit");
            System.Console.ReadLine();
            return 0;
        }

    }
}

client.cs

using System;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;
using System.Runtime.Remoting.Channels.Http;
using System.IO;

namespace RemotingSamples 
{
    public class Client
    {
        public static void Main(string[] args)
        {
            //使用TCP通道得到远程对象
            TcpChannel chan1 = new TcpChannel();
            ChannelServices.RegisterChannel(chan1);
            HelloServer obj1 = (HelloServer)Activator.GetObject(
                typeof(RemotingSamples.HelloServer),
                "tcp://localhost:8085/SayHello");
            if (obj1 == null)
            {
                System.Console.WriteLine(
                    "Could not locate TCP server");
            }
            MySerialized ser = obj1.GetMySerialized();
            if (!RemotingServices.IsTransparentProxy(ser))
            {
                Console.WriteLine("ser is not a transparent proxy");
            }
            ser.Foo();
            MyRemote rem = obj1.GetMyRemote();
            if (RemotingServices.IsTransparentProxy(rem))
            {
                Console.WriteLine("ser is a transparent proxy");
            }
            rem.Foo();

            System.Console.ReadLine();

        }

    }
}

运行后server端显示
Press Enter key to exit
HelloServer activated
HelloServer activated
MyRemote.Foo called
client显示
ser is not a transparent proxy
MySerialized.Foo called
ser is a transparent proxy
可见MyRemote为按引用列集,MyRemote.Foo called出现在server端,并且client端显示ser is a transparent proxy,它是通过在本地创建代理来访问远程对象.MySerialized.Foo called出现在客户端,并未在服务器端出现,它为按值列集,在本地得到远程对象的副本,直接在本地访问副本.