问一个.net remoting的问题

Question

在使用ClientSponsor的Register函数的时候,出现
未处理的“System.Runtime.Serialization.SerializationException”类型的异常出现在 
mscorlib.dll 中。
其他信息: 由于安全限制，无法访问类型 System.Runtime.Remoting.ObjRef。是什么意思,ths

Answer 1

是序列化时出现的错误。
在使用remoting技术时，对象需要能够序列化，如果对象不能序列化就会报错

Answer 2

贴出程序
MyRemoteObject.csusing System;
using System.Runtime.Remoting.Lifetime;namespace Wrox.Samples
{
public class MyRemoteObject : System.MarshalByRefObject
{
        private int state; public MyRemoteObject(int state)
{
Console.WriteLine("Constructor called");
this.state = state;
}        public int State
        {
            get
            {
                return state;
            }
            set
            {
                state = value;
            }
        }        public override object InitializeLifetimeService()
        {
            ILease lease = (ILease)base.InitializeLifetimeService();
            if (lease.CurrentState == LeaseState.Initial)
            {
                lease.InitialLeaseTime = TimeSpan.FromMinutes(1);
                lease.RenewOnCallTime = TimeSpan.FromSeconds(20);
            }
            return lease;        }        public string Hello()
        {
            Console.WriteLine("Hello called");
            return "Hello, .NET Client!";
        }
}
}SimpleServer.csusing System;
using System.Runtime.Remoting;namespace Wrox.Samples
{
class SimpleServer
{
static void Main(string[] args)
{
         RemotingConfiguration.Configure("SimpleServer.exe.config");         Console.WriteLine("Press return to exit");
         Console.ReadLine();
}
}
}SimpleServer.exe.config<configuration>
<system.runtime.remoting>
<application name="SimpleServer">
<service>
<activated type="Wrox.Samples.MyRemoteObject, MyRemoteObject" />
</service>
<channels>
<channel ref="tcp" port="9000" />
</channels>
</application>
</system.runtime.remoting>
</configuration>
SimpleClient.csusing System;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Lifetime;
using System.Threading;namespace Wrox.Samples
{
    public class MySponsor: ClientSponsor, ISponsor
    {
        TimeSpan ISponsor.Renewal(ILease lease)
        {
            Console.WriteLine("Renewal called");
            return this.RenewalTime;
        }
    } class SimpleClient
{
static void Main(string[] args)
{
            try
            {
                RemotingConfiguration.Configure("SimpleClient.exe.config");                MyRemoteObject obj = new MyRemoteObject(33);
                MySponsor sponsor = new MySponsor();
                sponsor.RenewalTime = TimeSpan.FromMinutes(2);
                sponsor.Register(obj);                for (int i=0; i < 20; i++)
                {
                    DisplayLease("In loop: " + i, obj);
                    obj.Hello();
                    Thread.Sleep(25000);
                }
            }
            catch (RemotingException ex)
            {
                Console.WriteLine(ex.Message);
            }
}        public static void DisplayLease(string s, MarshalByRefObject o)
        {
            ILease lease = o.GetLifetimeService() as ILease;
            if (lease != null)
            {
                Console.WriteLine(s + " - remaining lease time: " + lease.CurrentLeaseTime);
            }
        }
}
}
SimpleClient.exe.config
<configuration>
<system.runtime.remoting>
<application name="SimpleClient">
<client url="tcp://localhost:9000/SimpleServer">
<activated type="Wrox.Samples.MyRemoteObject, MyRemoteObject" />
</client>
<channels>
<channel ref="tcp" port="9002" />
</channels>
</application>
</system.runtime.remoting>
</configuration>

Answer 3

ClientSponsor的Register函数实现是如何的？