Re: About the remoting event

thanks Nicholas, when you said "callback interface" did you mean the one in
the asynchronous model, i am not very clear.
May you tell me more precisely or show me a few codes? thanx

"Nicholas Paldino [.NET/C# MVP]" wrote:

I find that using events is a PITA when using remoting. Rather, I would
define a callback interface that the client implements, and then make sure
that the class that implements it derives from MarshalByRefObject, and send
that to the server to call back onto when you want to fire an event. It's
much cleaner, and it works.


--
- Nicholas Paldino [.NET/C# MVP]
- mvp@xxxxxxxxxxxxxxxxxxxxxxxxxxx

"fairyvoice" <fairyvoice@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:4604E3F5-AF6B-4DDD-9C50-4FCBBD4EBB1F@xxxxxxxxxxxxxxxx
in a remoting application, i set a event in the host, and let the client
to
book it, and in the host side i set the TypeFilterLevel to Full and open
the
callback port in the client side, but told that these was an exception on
the
invoked object.
can anyone tell my why? It is a very simple application just to test, and
here is the code, i am using vs2008, thanx in advaned.

----------server side----------------------
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Ipc;
using System.Runtime.Remoting.Channels.Tcp;
using System.Runtime.Serialization.Formatters;
using System.IO;
using System.Collections;

namespace RcServer
{
class Program
{
static void Main(string[] args)
{
IDictionary pros = new Hashtable();
pros["portName"] = "host";
BinaryServerFormatterSinkProvider ss = new
BinaryServerFormatterSinkProvider();
ss.TypeFilterLevel = TypeFilterLevel.Full;
IChannel cnl = new IpcChannel(pros, new
BinaryClientFormatterSinkProvider(), ss);

ChannelServices.RegisterChannel(cnl, false);
RemotingConfiguration.RegisterWellKnownServiceType(typeof(Cat),
"cat", WellKnownObjectMode.Singleton);
Cat cat = new Cat();
Console.WriteLine("go");
Console.ReadLine();
}
}


public class Cat : MarshalByRefObject
{
public event EventHandler OnScreaming;
public void Scream()
{
Console.WriteLine("i am wake");
if (this.OnScreaming != null)
this.OnScreaming(this,null);
}

}
}

----------------client side-------------------------
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Ipc;
using System.Runtime.Serialization.Formatters;
using System.Collections;
using RcServer;

namespace RcClient
{
class Program
{
static void Main(string[] args)
{
IChannel cnl = new IpcChannel("MyCallback");
ChannelServices.RegisterChannel(cnl, false);
RemotingConfiguration.RegisterWellKnownClientType(typeof(Cat),
@"ipc://host/cat");
Cat c = (Cat)Activator.CreateInstance(typeof(Cat));
Rat jy = new Rat();
jy.ThereIsaCat(c);
c.Scream();

}
}

[Serializable]
public class Rat:MarshalByRefObject
{
public void ThereIsaCat(Cat cat)
{
cat.OnScreaming += new EventHandler(this.cat_OnScreaming);
}


void cat_OnScreaming(object sender, EventArgs e)
{
Console.WriteLine("cat's awake, run quick!");
}
}
}




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