What is faster? DirectCast(myObj, Integer) or Convert.ToInt32(myObj) ???

[Andreas Klemt]

Hello,
what has the better performance and what are you using?

Dim myObj As Object = 70
a) Dim myInt As Integer = DirectCast(myObj, Integer)
b) Dim myInt As Integer = Convert.ToInt32(myObj)

Thanks,
Andreas

[Andreas Klemt]

Hello John,
here are my measurements:

Convert.ToInt32 0,37
DirectCast(myObj, Integer) 0,04

Convert.ToString(myObj) 0,42
DirectCast(myObj, String) 0,07
CStr(myObj) 0,50
CType(myObj, String) 0,50

So DirectCast is much faster. What do you use?

Regards,
Andreas


"John Saunders" <john.saunders@surfcontrol.com> schrieb im Newsbeitrag
news:esZacafUDHA.1196@TK2MSFTNGP10.phx.gbl...

> I use Option Strict and don't have the problem very often.
>
> DirectCast should be faster in general, since the object _is_ an integer.
>
> To find out whether it's faster in your particular case, why not write a
> little test program which saves the start time, performs the operation
> 100000 times, then compares the start time to the end time? It would allow
> you to test the performance of anything you like.
>
> --
> John Saunders
> Internet Engineer
> [email]john.saunders@surfcontrol.com[/email]
>
> "Andreas Klemt" <aklemt68@hotmail.com> wrote in message
> news:ueVLz7eUDHA.2056@TK2MSFTNGP10.phx.gbl...

> > Hello,
> > what has the better performance and what are you using?
> >
> > Dim myObj As Object = 70
> > a) Dim myInt As Integer = DirectCast(myObj, Integer)
> > b) Dim myInt As Integer = Convert.ToInt32(myObj)
> >
> > Thanks,
> > Andreas
> >
> >

>
>

[Karl Seguin]

Andreas, how many times do you plan on posting the same question? You've
asked it 4 times since yesterday, always slightly differently..and EACH AND
EVERY TIME someone has provided you with a quality answer.

Did you read "Conversion Functions, CType, DirectCast, and System.Convert"
at
[url]http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dv_vstechart/html/vbtchmicrosoftvisualbasicnetinternals.asp[/url]
(as was previously provided)?? It provides a microsoft recommentation as to
which to use...what more could you possibly want?

Karl

"Andreas Klemt" <aklemt68@hotmail.com> wrote in message
news:OTUD1rfUDHA.2076@TK2MSFTNGP11.phx.gbl...

> Hello John,
> here are my measurements:
>
> Convert.ToInt32 0,37
> DirectCast(myObj, Integer) 0,04
>
> Convert.ToString(myObj) 0,42
> DirectCast(myObj, String) 0,07
> CStr(myObj) 0,50
> CType(myObj, String) 0,50
>
> So DirectCast is much faster. What do you use?
>
> Regards,
> Andreas
>
>
> "John Saunders" <john.saunders@surfcontrol.com> schrieb im Newsbeitrag
> news:esZacafUDHA.1196@TK2MSFTNGP10.phx.gbl...

> > I use Option Strict and don't have the problem very often.
> >
> > DirectCast should be faster in general, since the object _is_ an

integer.

> >
> > To find out whether it's faster in your particular case, why not write

a

> > little test program which saves the start time, performs the operation
> > 100000 times, then compares the start time to the end time? It would

allow

> > you to test the performance of anything you like.
> >
> > --
> > John Saunders
> > Internet Engineer
> > [email]john.saunders@surfcontrol.com[/email]
> >
> > "Andreas Klemt" <aklemt68@hotmail.com> wrote in message
> > news:ueVLz7eUDHA.2056@TK2MSFTNGP10.phx.gbl...

> > > Hello,
> > > what has the better performance and what are you using?
> > >
> > > Dim myObj As Object = 70
> > > a) Dim myInt As Integer = DirectCast(myObj, Integer)
> > > b) Dim myInt As Integer = Convert.ToInt32(myObj)
> > >
> > > Thanks,
> > > Andreas
> > >
> > >

> >
> >

>
>

[Andreas Klemt]

Hello Karl,
I was confused about DirectCast because I never heard about it.
Now after I tested it, everything is clear.

Thanks to you for the link!!

Best Regards,
Andreas


"Karl Seguin" <kseguin##crea.ca> schrieb im Newsbeitrag
news:uQduCwfUDHA.2456@TK2MSFTNGP09.phx.gbl...

> Andreas, how many times do you plan on posting the same question? You've
> asked it 4 times since yesterday, always slightly differently..and EACH

AND

> EVERY TIME someone has provided you with a quality answer.
>
> Did you read "Conversion Functions, CType, DirectCast, and System.Convert"
> at
>

[url]http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dv_vstechart/html/vbtchmicrosoftvisualbasicnetinternals.asp[/url]

> (as was previously provided)?? It provides a microsoft recommentation as

to

> which to use...what more could you possibly want?
>
> Karl
>
> "Andreas Klemt" <aklemt68@hotmail.com> wrote in message
> news:OTUD1rfUDHA.2076@TK2MSFTNGP11.phx.gbl...

> > Hello John,
> > here are my measurements:
> >
> > Convert.ToInt32 0,37
> > DirectCast(myObj, Integer) 0,04
> >
> > Convert.ToString(myObj) 0,42
> > DirectCast(myObj, String) 0,07
> > CStr(myObj) 0,50
> > CType(myObj, String) 0,50
> >
> > So DirectCast is much faster. What do you use?
> >
> > Regards,
> > Andreas
> >
> >
> > "John Saunders" <john.saunders@surfcontrol.com> schrieb im Newsbeitrag
> > news:esZacafUDHA.1196@TK2MSFTNGP10.phx.gbl...

> > > I use Option Strict and don't have the problem very often.
> > >
> > > DirectCast should be faster in general, since the object _is_ an

> integer.

> > >
> > > To find out whether it's faster in your particular case, why not

write

> a

> > > little test program which saves the start time, performs the operation
> > > 100000 times, then compares the start time to the end time? It would

> allow

> > > you to test the performance of anything you like.
> > >
> > > --
> > > John Saunders
> > > Internet Engineer
> > > [email]john.saunders@surfcontrol.com[/email]
> > >
> > > "Andreas Klemt" <aklemt68@hotmail.com> wrote in message
> > > news:ueVLz7eUDHA.2056@TK2MSFTNGP10.phx.gbl...
> > > > Hello,
> > > > what has the better performance and what are you using?
> > > >
> > > > Dim myObj As Object = 70
> > > > a) Dim myInt As Integer = DirectCast(myObj, Integer)
> > > > b) Dim myInt As Integer = Convert.ToInt32(myObj)
> > > >
> > > > Thanks,
> > > > Andreas
> > > >
> > > >
> > >
> > >

> >
> >

>
>

[John Saunders]

C# :-)

In C#, I use (int) myObj, which is about the same thing as DirectCast.

--
John Saunders
Internet Engineer
[email]john.saunders@surfcontrol.com[/email]

"Andreas Klemt" <aklemt68@hotmail.com> wrote in message
news:OTUD1rfUDHA.2076@TK2MSFTNGP11.phx.gbl...

> Hello John,
> here are my measurements:
>
> Convert.ToInt32 0,37
> DirectCast(myObj, Integer) 0,04
>
> Convert.ToString(myObj) 0,42
> DirectCast(myObj, String) 0,07
> CStr(myObj) 0,50
> CType(myObj, String) 0,50
>
> So DirectCast is much faster. What do you use?
>
> Regards,
> Andreas
>
>
> "John Saunders" <john.saunders@surfcontrol.com> schrieb im Newsbeitrag
> news:esZacafUDHA.1196@TK2MSFTNGP10.phx.gbl...

> > I use Option Strict and don't have the problem very often.
> >
> > DirectCast should be faster in general, since the object _is_ an

integer.

> >
> > To find out whether it's faster in your particular case, why not write

a

> > little test program which saves the start time, performs the operation
> > 100000 times, then compares the start time to the end time? It would

allow

> > you to test the performance of anything you like.
> >
> > --
> > John Saunders
> > Internet Engineer
> > [email]john.saunders@surfcontrol.com[/email]
> >
> > "Andreas Klemt" <aklemt68@hotmail.com> wrote in message
> > news:ueVLz7eUDHA.2056@TK2MSFTNGP10.phx.gbl...

> > > Hello,
> > > what has the better performance and what are you using?
> > >
> > > Dim myObj As Object = 70
> > > a) Dim myInt As Integer = DirectCast(myObj, Integer)
> > > b) Dim myInt As Integer = Convert.ToInt32(myObj)
> > >
> > > Thanks,
> > > Andreas
> > >
> > >

> >
> >

>
>