Re: Issue with .net remoting events

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From: Ken Kolda (ken.kolda_at_elliemae-nospamplease.com)
Date: 06/30/04 

Date: Wed, 30 Jun 2004 08:32:56 -0700

Check to make sure you're not remoting your AvisCarAgency instance as a
SingleCall instead of a Singleton -- that's the most likely source of your
problems.

Ken

"DotNetJunkies User" <User@-NOSPAM-DotNetJunkies.com> wrote in message
news:%23dADqTlXEHA.1000@TK2MSFTNGP12.phx.gbl...
> Hi
> For some reason, the event handler is not getting subscribed to the event.
>
> Here's the code
> =====================================
> >>> Shared Assembly
> using System;
>
> namespace SharedAssemblyCarProject
> {
> public class EventShim: MarshalByRefObject
> {
> protected NewCarFoundEventHandler TargetHandlers;
> public EventShim(NewCarFoundEventHandler Target)
> {
> TargetHandlers += Target;
> }
> public void Execute(string car)
> {
> TargetHandlers(car);
> }
> }
>
> public delegate void NewCarFoundEventHandler(string car);
> public interface ICarAgency
> {
> string[] GetCars();
> string ReserverCar(string car);
> event NewCarFoundEventHandler NewCarFoundEvent;
> }
> }
> =====================================
> >>>> Server code
> using System;
> using SharedAssemblyCarProject;
>
> namespace RemoteServer
> {
> public class AvisCarAgency : MarshalByRefObject,
SharedAssemblyCarProject.ICarAgency
> {
> public AvisCarAgency()
> {
> //
> // TODO: Add constructor logic here
> //
> }
>
> public string[] GetCars()
> {
> if (NewCarFoundEvent!=null)
> NewCarFoundEvent("Honda");
> return new string[] {"Honda", "Toyota", "Civic", "Merc", "BMW",
"NISSAN" };
> }
>
> public string ReserverCar(string car)
> {
> return "Reserverd";
> }
>
> public event NewCarFoundEventHandler NewCarFoundEvent;
> }
> }
> ======================================
> >> Client
> EventShim shim = new EventShim(new
NewCarFoundEventHandler(AvisBoston_NewCarFoundEvent));
>
> AvisBoston.NewCarFoundEvent += new NewCarFoundEventHandler(shim.Execute);
>
> MessageBox.Show("Number: " + AvisBoston.GetCars().Length);
> ======================================
>
> The method AvisBoston_NewCarFoundEvent is present in the client class.
Also, I've added the typeFilterLevel attribute to get rid of the
serialization exception in .net 1.1.
>
> My problem is that although I think Im adding the handler in
> AvisBoston.NewCarFoundEvent += new .....
> statement, when I call the GetCars() method, it test for null of
NewCarFoundEvent and returns true.
>
> Any suggestions would be highly appreciated.
>
>
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