String builder

[simonZ]

I have Function with string parameteres:

public string newLine(String string1,String string2,String string3){

StringBuilder webLine = new StringBuilder() ;
webLine.Append( "<tD nowrap>" + string1 + "</td><td nowrap>" +
formatR(string2 , 2) + "</tD><td nowrap>" + string3 + "</td><td>")
return webLine.ToStrin g();
}

Is this ok or is better to work like that:

public string newLine(String string1,String string2,String string3){

StringBuilder webLine = new StringBuilder() ;

webLine.Append( "<tD nowrap>");
webLine.Append( string1);
webLine.Append( "</td><td nowrap>");
webLine.Append( formatR(string2 , 2));
webLine.Append( "</tD><td nowrap>");
webLine.Append( string3);
webLine.Append( "</td><td>");

return webLine.ToStrin g();
}

What is the most performance way to work with string builder?

Regards,S

[Chester]

Hi Simon,

The 1st method is not much useful as you are doing string concatenation -
not taking the use of StringBuilder even though you are creation an object of
StringBuilder (creation of StringBuilder has a cost in performance). So, it
is better you use the 2nd method.

Cheers,
Chester
"simonZ" wrote:

I have Function with string parameteres:

public string newLine(String string1,String string2,String string3){

StringBuilder webLine = new StringBuilder() ;
webLine.Append( "<tD nowrap>" + string1 + "</td><td nowrap>" +
formatR(string2 , 2) + "</tD><td nowrap>" + string3 + "</td><td>")
return webLine.ToStrin g();
}

Is this ok or is better to work like that:

public string newLine(String string1,String string2,String string3){

StringBuilder webLine = new StringBuilder() ;

webLine.Append( "<tD nowrap>");
webLine.Append( string1);
webLine.Append( "</td><td nowrap>");
webLine.Append( formatR(string2 , 2));
webLine.Append( "</tD><td nowrap>");
webLine.Append( string3);
webLine.Append( "</td><td>");

return webLine.ToStrin g();
}

What is the most performance way to work with string builder?

Regards,S

[Marc Gravell]

StringBuilder is mainly useful when concatenating in a loop. In your case,
you are simply concatenating strings... you may find the
string.Concat(p arams string[]) easier... in fact, the compiler does this for
you for most single-line string concatenations.

Your first example *achieves nothing*; do not use this.
The second example is probably less efficient than simply using:
return "<tD nowrap>" + string1 + "</td><td nowrap>" + formatR(string2 , 2) +
"</tD><td nowrap>" + string3 + "</td><td>";

As always, Jon has a good article:
http://www.yoda.arachsys.com/csharp/stringbuilder.html

Marc

[Esref DURNA]

this is a nice article too
http://www.codeproject.com/Purgatory/string.asp
string versus stringbuilder

--
Esref DURNA
Software Engineer
Asp.Net , C#, C++ , C
"simonZ" wrote:

I have Function with string parameteres:

public string newLine(String string1,String string2,String string3){

StringBuilder webLine = new StringBuilder() ;
webLine.Append( "<tD nowrap>" + string1 + "</td><td nowrap>" +
formatR(string2 , 2) + "</tD><td nowrap>" + string3 + "</td><td>")
return webLine.ToStrin g();
}

Is this ok or is better to work like that:

public string newLine(String string1,String string2,String string3){

StringBuilder webLine = new StringBuilder() ;

webLine.Append( "<tD nowrap>");
webLine.Append( string1);
webLine.Append( "</td><td nowrap>");
webLine.Append( formatR(string2 , 2));
webLine.Append( "</tD><td nowrap>");
webLine.Append( string3);
webLine.Append( "</td><td>");

return webLine.ToStrin g();
}

What is the most performance way to work with string builder?

Regards,S

[Jon Skeet [C# MVP]]

Chester wrote:

The 1st method is not much useful as you are doing string concatenation -
not taking the use of StringBuilder even though you are creation an object of
StringBuilder (creation of StringBuilder has a cost in performance). So, it
is better you use the 2nd method.

No, it's not.

It's better to use:

return "<tD nowrap>" + string1 + "</td><td nowrap>" +
formatR(string2 , 2) + "</tD><td nowrap>" + string3 +
"</td><td>";

All the string concatenation is done in one call, so String.Concat is
used once, and no temporary string objects are created. There's no need
for a StringBuilder at all.

(Admittedly I'd use String.Format to start with, but there we go...)

See http://www.pobox.com/~skeet/csharp/stringbuilder.html for more
info.

Jon

[Dustin Campbell]

(Admittedly I'd use String.Format to start with, but there we go...)

And, of course, String.Format() actually creates a StringBuilder under the
covers and calls StringBuidler.A ppendFormat() (where the real formatting
logic is implemented), so... ;-)

Best Regards,
Dustin Campbell
Developer Express Inc.

[simonZ]

Thank you all.
I read all articles and i have one question:

If I have string length from 1000 to 10000(I don't know until run time) and
I built it with string builder, is it better to declare

new StringBuilder(1 0000);
or
new StringBuilder() ;
What is the difference?

Thanks Simon

"Esref DURNA" <es*********@mi crosoft.comwrot e in message
news:5F******** *************** ***********@mic rosoft.com...

this is a nice article too
http://www.codeproject.com/Purgatory/string.asp
string versus stringbuilder

--
Esref DURNA
Software Engineer
Asp.Net , C#, C++ , C
"simonZ" wrote:

>I have Function with string parameteres:

public string newLine(String string1,String string2,String string3){

StringBuilder webLine = new StringBuilder() ;
webLine.Append( "<tD nowrap>" + string1 + "</td><td nowrap>" +
formatR(string 2, 2) + "</tD><td nowrap>" + string3 + "</td><td>")
return webLine.ToStrin g();
}

Is this ok or is better to work like that:

public string newLine(String string1,String string2,String string3){

StringBuilder webLine = new StringBuilder() ;

webLine.Append( "<tD nowrap>");
webLine.Append( string1);
webLine.Append( "</td><td nowrap>");
webLine.Append( formatR(string2 , 2));
webLine.Append( "</tD><td nowrap>");
webLine.Append( string3);
webLine.Append( "</td><td>");

return webLine.ToStrin g();
}

What is the most performance way to work with string builder?

Regards,S

[Willy Denoyette [MVP]]

"simonZ" <si*********@st udio-moderna.comwrot e in message
news:u0******** ******@TK2MSFTN GP06.phx.gbl...

Thank you all.
I read all articles and i have one question:

If I have string length from 1000 to 10000(I don't know until run time) and I built it
with string builder, is it better to declare

new StringBuilder(1 0000);
or
new StringBuilder() ;
What is the difference?

The difference is the size of the builders backing-store at construction time, 10000 vs. 16
respectively. So, in order to prevent the number of store expansions when filling the SB,
you better create a SB with an initial size of 1000 up to 10000.

Willy.

[Chris Saunders]

I believe that if performance is your greatest concern here you should use
new StringBuilder(1 0000);.
On modern systems its not much of a potential waste of space and garbage
collection will take care
of this appropriatly.

If memory use is your greatest concern use new StringBuilder(1 0000);.

Regards
Chris Saunders

"simonZ" <si*********@st udio-moderna.comwrot e in message
news:u0******** ******@TK2MSFTN GP06.phx.gbl...

Thank you all.
I read all articles and i have one question:

If I have string length from 1000 to 10000(I don't know until run time)
and I built it with string builder, is it better to declare

new StringBuilder(1 0000);
or
new StringBuilder() ;
What is the difference?

Thanks Simon

"Esref DURNA" <es*********@mi crosoft.comwrot e in message
news:5F******** *************** ***********@mic rosoft.com...

>this is a nice article too
http://www.codeproject.com/Purgatory/string.asp
string versus stringbuilder

--
Esref DURNA
Software Engineer
Asp.Net , C#, C++ , C
"simonZ" wrote:

>>I have Function with string parameteres:

public string newLine(String string1,String string2,String string3){

StringBuilder webLine = new StringBuilder() ;
webLine.Append( "<tD nowrap>" + string1 + "</td><td nowrap>" +
formatR(strin g2, 2) + "</tD><td nowrap>" + string3 + "</td><td>")
return webLine.ToStrin g();
}

Is this ok or is better to work like that:

public string newLine(String string1,String string2,String string3){

StringBuilder webLine = new StringBuilder() ;

webLine.Append( "<tD nowrap>");
webLine.Append( string1);
webLine.Append( "</td><td nowrap>");
webLine.Append( formatR(string2 , 2));
webLine.Append( "</tD><td nowrap>");
webLine.Append( string3);
webLine.Append( "</td><td>");

return webLine.ToStrin g();
}

What is the most performance way to work with string builder?

Regards,S