String.Concat vs String.Format

[ramadu]

I know its a sin to use strings, lets skip that part...

Which of these is faster and uses less memory?

String.Format(" SomeValue='{0}' ", m_Value);

or

String.Concat(" SomeValue='", m_Value, "'");

- ramadu

[cody]

If you think a bit about it you 'll get the answer.

String.Concat is made to do exactly this where it get the name from, whereas
String.Format can do lots of stuff and has to scan the string for format
specifiers first.
"ramadu" <tn*@newsgroups .nospam> schrieb im Newsbeitrag
news:%2******** **********@TK2M SFTNGP04.phx.gb l...

I know its a sin to use strings, lets skip that part...

Which of these is faster and uses less memory?

String.Format(" SomeValue='{0}' ", m_Value);

or

String.Concat(" SomeValue='", m_Value, "'");

- ramadu

[ramadu]

I realize that but does .net do any compiler optimizations if
string.Format is used?

- ramadu

:

If you think a bit about it you 'll get the answer.

String.Concat is made to do exactly this where it get the name from, whereas
String.Format can do lots of stuff and has to scan the string for format
specifiers first.
"ramadu" <tn*@newsgroups .nospam> schrieb im Newsbeitrag
news:%2******** **********@TK2M SFTNGP04.phx.gb l...

I know its a sin to use strings, lets skip that part...

Which of these is faster and uses less memory?

String.Format(" SomeValue='{0}' ", m_Value);

or

String.Concat(" SomeValue='", m_Value, "'");

- ramadu

[Michael Nemtsev]

Hello ramadu,

If u use reflector you can see that String.Format use StringBuilder class
and calls its AppendFormat method that is pretty rich.
String,Contat uses string.FastAllo cateString and FillStringCheck ed methods

I'd assume that String.Concat is more fastest case

r> I know its a sin to use strings, lets skip that part...
r>
r> Which of these is faster and uses less memory?
r>
r> String.Format(" SomeValue='{0}' ", m_Value);
r>
r> or
r>
r> String.Concat(" SomeValue='", m_Value, "'");
r>
r> - ramadu
r>
---
WBR,
Michael Nemtsev :: blog: http://spaces.msn.com/laflour

"At times one remains faithful to a cause only because its opponents do not
cease to be insipid." (c) Friedrich Nietzsche

[ramadu]

But in that case String.Concat will be costly in terms of memory as it
will create multiple immutable strings...

- ramadu

:

Hello ramadu,

If u use reflector you can see that String.Format use StringBuilder
class and calls its AppendFormat method that is pretty rich.
String,Contat uses string.FastAllo cateString and FillStringCheck ed methods

I'd assume that String.Concat is more fastest case

r> I know its a sin to use strings, lets skip that part...
r> r> Which of these is faster and uses less memory?
r> r> String.Format(" SomeValue='{0}' ", m_Value);
r> r> or
r> r> String.Concat(" SomeValue='", m_Value, "'");
r> r> - ramadu
r> ---
WBR,
Michael Nemtsev :: blog: http://spaces.msn.com/laflour

"At times one remains faithful to a cause only because its opponents do
not cease to be insipid." (c) Friedrich Nietzsche

[chanmm]

Just for the sake of discussion. All your variables has a scope. How many
variable can you accumulate till you quit the program? So, to me I would say
I use whichever way I feel is comfortable to me.

chanmm

"ramadu" <tn*@newsgroups .nospam> wrote in message
news:%2******** **********@TK2M SFTNGP04.phx.gb l...

I know its a sin to use strings, lets skip that part...

Which of these is faster and uses less memory?

String.Format(" SomeValue='{0}' ", m_Value);

or

String.Concat(" SomeValue='", m_Value, "'");

- ramadu

[Jon Skeet [C# MVP]]

ramadu <tn*@newsgroups .nospam> wrote:

I know its a sin to use strings, lets skip that part...
In what way? Using strings is part of every day life. Is there some
particular use you're thinking of which isn't a good idea, like using
values directly in SQL statements?
Which of these is faster and uses less memory?

String.Format(" SomeValue='{0}' ", m_Value);

or

String.Concat(" SomeValue='", m_Value, "'");

Well, the Concat call is faster, *but* it's unlikely to ever be
significant. The more important question is "Which of these is clearer,
and more readable?" There, the answer is String.Format IMO. On the
other hand, your Concat call could be made easier to read too:

string x = "SomeValue= '" + m_Value + "'";

That will compile to the same code, and is fairly readable. I'd still
use String.Format though, I think.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[Mark Wilden]

"Jon Skeet [C# MVP]" <sk***@pobox.co m> wrote in message
news:MP******** *************** *@msnews.micros oft.com...

Which of these is faster and uses less memory?

String.Format(" SomeValue='{0}' ", m_Value);

or

String.Concat(" SomeValue='", m_Value, "'");

Well, the Concat call is faster, *but* it's unlikely to ever be
significant. The more important question is "Which of these is clearer,
and more readable?" There, the answer is String.Format IMO.

I don't know -- when you're just concatenating strings, + (or Concat) is
more readable, IMO.

///ark

[cody]

what do you mean with "compiler optimizations"?

"ramadu" <tn*@newsgroups .nospam> schrieb im Newsbeitrag
news:44******** ******@newsgrou ps.nospam...

I realize that but does .net do any compiler optimizations if string.Format
is used?

- ramadu

:

If you think a bit about it you 'll get the answer.

String.Concat is made to do exactly this where it get the name from,
whereas String.Format can do lots of stuff and has to scan the string for
format specifiers first.
"ramadu" <tn*@newsgroups .nospam> schrieb im Newsbeitrag
news:%2******** **********@TK2M SFTNGP04.phx.gb l...

I know its a sin to use strings, lets skip that part...

Which of these is faster and uses less memory?

String.Format(" SomeValue='{0}' ", m_Value);

or

String.Concat(" SomeValue='", m_Value, "'");

- ramadu

[Göran Andersson]

The Concat would be slightly faster and memory efficient, but if you are
trying to optimize your code you are probably looking in the wrong place.

What are you going to use the string for?

ramadu wrote:

I know its a sin to use strings, lets skip that part...

Which of these is faster and uses less memory?

String.Format(" SomeValue='{0}' ", m_Value);

or

String.Concat(" SomeValue='", m_Value, "'");

- ramadu