typeof

[Peter Kirk]

Hi

is there a difference between "this.GetType() " and typeof(MyClass) ?

The only reason I ask is that we are using log4net in a project, and we give
the Loggers names based on the class name.

For example, some people use:
ILog log = LogManager.GetL ogger(typeof(Fi nder).ToString( ));
others use:
ILog log = LogManager.GetL ogger(this.GetT ype().ToString( ));

Is there any difference?

Thanks,
Peter

[Joanna Carter \(TeamB\)]

Re: typeof

"Peter Kirk" <pk@alpha-solutions.dk> a écrit dans le message de news:
#PviwjkcFHA.155 6@TK2MSFTNGP10. phx.gbl...
[color=blue]
> is there a difference between "this.GetType() " and typeof(MyClass) ?[/color]

GetType() only works on instances, typeof only works on types.

Joanna

--
Joanna Carter
Consultant Software Engineer

[Helge Jensen]

Re: typeof



Peter Kirk wrote:[color=blue]
> Hi
>
> is there a difference between "this.GetType() " and typeof(MyClass) ?[/color]

this.GetType() is virtual, and will give you the type of this instance.
typeof(MyClass) is static and will give you the type of MyClass.

The difference is apparent here:

class Bar {
string TestType() {
return string.format(" this.GetType()= {0}, typeof(Bar)={1} ",
this.GetType(), typeof(Bar)); }
}
class Foo: Bar {}

Console.Writeli ne(new Foo().TestType( ));
[color=blue]
> For example, some people use:
> ILog log = LogManager.GetL ogger(typeof(Fi nder).ToString( ));
> others use:
> ILog log = LogManager.GetL ogger(this.GetT ype().ToString( ));
>
> Is there any difference?[/color]

Yes, and even worse... it is significant, since typeof() and GetType()
will put log-messages from Foo in different loggers.

BTW: You cannot argue which method is "best" in general for your
purpose, both would probably have their valid uses.

--
Helge Jensen
mailto:helge.je nsen@slog.dk
sip:helge.jense n@slog.dk
-=> Sebastian cover-music: http://ungdomshus.nu <=-

[Peter Kirk]

Re: typeof

"Helge Jensen" <helge.jensen@s log.dk> skrev i en meddelelse
news:42B13F80.9 080908@slog.dk. ..[color=blue]
> class Bar {
> string TestType() {
> return string.format(" this.GetType()= {0}, typeof(Bar)={1} ",
> this.GetType(), typeof(Bar)); }
> }
> class Foo: Bar {}
>
> Console.Writeli ne(new Foo().TestType( ));
>[color=green]
>> For example, some people use:
>> ILog log = LogManager.GetL ogger(typeof(Fi nder).ToString( ));
>> others use:
>> ILog log = LogManager.GetL ogger(this.GetT ype().ToString( ));
>>
>> Is there any difference?[/color]
>
> Yes, and even worse... it is significant, since typeof() and GetType()
> will put log-messages from Foo in different loggers.
>
> BTW: You cannot argue which method is "best" in general for your purpose,
> both would probably have their valid uses.[/color]

OK, I can see arguments for both sides.

With respect to log4net, then, what are good, consistent naming conventions
for loggers?

[Cowboy (Gregory A. Beamer) - MVP]

RE: typeof

GetType tells the type of a particular instance of a class. typeof() uses
reflection to look at the actual underlying type. From the standpoint of the
code, the main difference is whether or not you are looking at an instance of
a class to determine the logger or you are working without an instance and
creating one based on a specific type.

Hope this helps.

--
Gregory A. Beamer
MVP; MCP: +I, SE, SD, DBA

*************** ************
Think Outside the Box!
*************** ************


"Peter Kirk" wrote:
[color=blue]
> Hi
>
> is there a difference between "this.GetType() " and typeof(MyClass) ?
>
> The only reason I ask is that we are using log4net in a project, and we give
> the Loggers names based on the class name.
>
> For example, some people use:
> ILog log = LogManager.GetL ogger(typeof(Fi nder).ToString( ));
> others use:
> ILog log = LogManager.GetL ogger(this.GetT ype().ToString( ));
>
> Is there any difference?
>
> Thanks,
> Peter
>
>
>[/color]