You can overload both != and == differently. This is required to
implement ternary logic.
Check out the following:
public class Test
{
public static void Main(string[] args)
{
Test t1 = new Test();
Test t2 = new Test();
System.Console.WriteLine(t1 == t2);
System.Console.WriteLine(t1 != t2);
}
public static bool operator==(Test t1, Test t2)
{
System.Console.WriteLine("==");
return false;
}
public static bool operator!=(Test t1, Test t2)
{
System.Console.WriteLine("!=");
return false;
}
}
Regards,
Jeroen
> -----Original Message-----
> From: dotnet discussion [mailto:[EMAIL PROTECTED]]
> On Behalf Of Shawn Wildermuth
> Sent: Saturday, May 04, 2002 21:12
> To: [EMAIL PROTECTED]
> Subject: Re: [DOTNET] What is the correct way to test for Is
> Nothing in C#?
>
>
> First of all, you can't overload the != directly, only == (you get !=
> from the == operation). Second, I would say:
>
> if (xyz != null)
>
> Or
>
> if (!(xys == null))
>
> Both are equivalent since you can only overload the == operator (of
> course the second one is just plain ugly I wouldn't really
> use it except
> to show this point).
>
> Thanks,
>
> Shawn Wildermuth
> [EMAIL PROTECTED]
>
> > -----Original Message-----
> > From: dotnet discussion [mailto:[EMAIL PROTECTED]]
> > On Behalf Of David Ferguson
> > Sent: Saturday, May 04, 2002 3:06 PM
> > To: [EMAIL PROTECTED]
> > Subject: [DOTNET] What is the correct way to test for Is
> > Nothing in C#?
> >
> >
> > In VB I would say...
> >
> > if (Not xyz Is Nothing)
> >
> > In C# I am inclined to say...
> >
> > if (xyz != null)
> >
> > but I am concerned that an object might override operator !=.
> > What is the recommended way to do this test in C#?
> >
> > Thanks...David
> >
> > You can read messages from the DOTNET archive, unsubscribe
> > from DOTNET, or subscribe to other DevelopMentor lists at
> > http://discuss.develop.com.
> >
>
> You can read messages from the DOTNET archive, unsubscribe
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>
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