[Mono-list] Mono/.Net: object comparison

[Dmitry Kostenko]

Hello Julien,

I'm sorry but I could not reproduce this behaviour with .NET 1.1. Am I doing anyhing wrong?
Here is the source code:
===
using System.Collections;

public class A
{
   public string a = "a";
   public string b = "b";
   public string c = "c";
}

public class Program
{
   public static void Main()
   {
      ArrayList list = new ArrayList();
      list.Add(new A());

      A a = new A();
      if (list.Contains(a))
        System.Console.WriteLine("bad");
      else
        System.Console.WriteLine("good");
   }
}
===
It outputs "good" for me on .NET 1.1, compiled with csc, which I suppose to be
the correct behaviour.

I have been confused a lot when you mentioned that new A() == new A() or
ArrayList.Contains(new A()) may return true for a clean class A
(without overridden Equals(), GetHashCode(), operator == etc).

Do you have Equals(), GetHashCode() or operator == () overridden?

With best regards,
Dmitry Kostenko

> ------------------------------
> 
> Message: 3
> Date: Thu, 30 Jun 2005 18:16:16 -0400
> From: Julien Sobrier <julien at sobrier.net>
> Subject: Re: [Mono-list] Mono/.Net: object comparison
> To: mono-list at lists.ximian.com
> Message-ID: <42C46F30.4080205 at sobrier.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> Sorry for the delay. I did some tests with 1.1.8, same problem.
>
> The code looks like this:
> 
> ArrayList list = new ArrayList();
> 
> list.Add(new MyClass());
> 
> MyClass one = new MyClass();
> 
> bool result = list.Contains(one); --> return false with mono, true with 
> dot-net
> 
> I'll add this to bugzilla next week.
> 
> Thank you
>