goto case null

[Clive Dixon]

If C# (VS 2003) allows switch on null, why does it not allow "goto case
null":

switch (someString)
{
case "BlahBlahBl ah":
break;

case null:
break;

default:
goto case null;

}

Compiler error:
"No such label 'case 0:' within the scope of the goto statement"

Is this an omission or is there some good reason for disallowing it?

--
=============== =======
Clive Dixon
Digita Ltd. (www.digita.com)

[SirMike]

Re: goto case null

Dnia Thu, 2 Nov 2006 14:19:56 -0000, Clive Dixon napisa³(a):

Compiler error:
"No such label 'case 0:' within the scope of the goto statement"

case 0 is not a label :)

--
SirMike - http://www.sirmike.org

C makes it easy to shoot yourself in the foot; C++ makes it harder, but
when you do, it blows away your whole leg. - Bjarne Stroustrup

[Clive Dixon]

Re: goto case null

Agreed. But what I have written is "case null", not "case 0". I wouldn't
have thought it beyond the wit of the compiler writers to make this work.

It seems that I can work around this by writing "goto case (string)null".
Clearly the compiler is assuming for some reason that I'm doing a switch on
type 'int' even though it's on type 'string', and converting null to 0.
(Though I'm not clear why it would do this. This is C#, not C++...)

--
=============== =======
Clive Dixon
Digita Ltd. (www.digita.com)


"SirMike" <sirmike@FUCKSP AMMERSpoczta.on et.plwrote in message
news:1rdwvu0tik 81y.1piyj4d1x3l mt$.dlg@40tude. net...

Dnia Thu, 2 Nov 2006 14:19:56 -0000, Clive Dixon napisa³(a):
>

>Compiler error:
>"No such label 'case 0:' within the scope of the goto statement"

>
case 0 is not a label :)
>
--
SirMike - http://www.sirmike.org
>
C makes it easy to shoot yourself in the foot; C++ makes it harder, but
when you do, it blows away your whole leg. - Bjarne Stroustrup

[Christof Nordiek]

Re: goto case null

This is boviously a bug in the c#-compiler of VS2003. Yes, it does interpret
'null' as zero in the 'goto case'. I tested it with an int switch
expression.

As i tested also, this is corrected in VS2005.

"Clive Dixon" <clived.nolunch eonmeat@digita. noluncheonmeat. comschrieb im
Newsbeitrag news:eo3G6no$GH A.2192@TK2MSFTN GP02.phx.gbl...

If C# (VS 2003) allows switch on null, why does it not allow "goto case
null":
>
switch (someString)
{
case "BlahBlahBl ah":
break;
>
case null:
break;
>
default:
goto case null;
>
}
>
Compiler error:
"No such label 'case 0:' within the scope of the goto statement"
>
Is this an omission or is there some good reason for disallowing it?
>
--
=============== =======
Clive Dixon
Digita Ltd. (www.digita.com)
>
>
>