What's wrong with this code?

Posted By: footballism | Mar 27th, 2007 @ 6:42 AM
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Comments: 3 | Views: 2613
#Mar 27th, 2007 @ 6:42 AM
footballism
footballism
I've been avalonized!
    I just encounter a piece of tricky code, and apparently, it doesn't work, but the reason why it's not working is a bit tricky indeed:

using System;

public class Client : MarshalByRefObject
{
    public delegate void MessageCallBack();
    static void Main()
    {
        AppDomain ad = AppDomain.CreateDomain("ServerDomain");
        Client client = (Client)ad.CreateInstanceAndUnwrap(typeof(Client).Assembly.FullName, "Client");
        String msg = "Login";
        MessageCallBack callback = new MessageCallBack(delegate { Console.WriteLine(msg);});
        client.SendMessage(callback);
    }

    public void SendMessage(MessageCallBack callback)
    {
        callback();
    }
}

Hopefully this piece of puzzle can make your day:D

Sheva
#Mar 27th, 2007 @ 12:31 PM
Mar7in
Mar7in
"The Dream of Infinite Processing Power or the Nightmare of Reality"
Take a look at this blog entry: http://odetocode.com/Blogs/scott/archive/2006/09/11/6546.aspx

The code can be changed to work:

using System;

public class Client : MarshalByRefObject
{
    public delegate void MessageCallBack();




    



    static String msg = "Login";
    public MessageCallBack Callback = new MessageCallBack(delegate { Console.WriteLine(msg);});


    
    static void Main()
    {
        AppDomain ad = AppDomain.CreateDomain("ServerDomain");
        Client client = (Client)ad.CreateInstanceAndUnwrap(typeof(Client).Assembly.FullName, "Client");
                client.SendMessage(client.Callback);
    }

    public void SendMessage(MessageCallBack callback)
    {
        callback();
    }
}
#Mar 28th, 2007 @ 3:09 AM
footballism
footballism
I've been avalonized!
    Mar7in, you code can work, but it doesn't explain why the above code breaks. actually in your code, no marshaling of delegate between the Client AppDomain and Server Appdomains exist. because the client.callback are available in the remote AppDomains.

Sheva
#Mar 28th, 2007 @ 3:15 AM
footballism
footballism
I've been avalonized!
Oops, Scott Allen shooted the gun much early than I did.

Sheva
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