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Need Help on String.Format() method

P: n/a
hi guys!
back again with another query.
the problem is like this.

i want to print a line like this:
"---------------------------------------------"

the easiest way is to simply assign it to string and print it.
but i want to use the String.Format() method if possible to do it.

All i came to know about this method is, you can use
String.Format("{argumentIndex[,alignment][:formatString]}",argumentIndex)

do specify paddin and some format. but i dont get it how to provide the
formatstring. i guess it is for formating the argument if i'm not
wrong.
so guys, i need your help here.
i want to do something like this
String.Format("{0,40}","-")

this way it should return me the string filled with 40 dashes.

if there is any better way to do it, please let me know.
i'm trying to learn something about String object. Please help me.

Thanks,

Lucky

Nov 24 '06 #1
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8 Replies


P: n/a
"Lucky" <tu************@gmail.comwrote in message
news:11**********************@j72g2000cwa.googlegr oups.com...
if there is any better way to do it, please let me know.
string strRepeat = new String('-', 40);
i'm trying to learn something about String object. Please help me.
Google
MSDN
Nov 24 '06 #2

P: n/a
You're barking up the wrong tree here, Lucky.

The String Object does not implement IFormattable, because an instance of
System.String is already a string. Therefore, you can not use String.Format
to format a string. The String.Format method replaces the "format item(s)"
represented by the substring(s) having curly brackets in the string, with
Formatted text representations of the objects that are in the parameter or
parameters (depending on the overload you use) following the string
parameter. There is one overload that takes an IFormatProvider as the first
argument, enabling you to create a custom IFormatter class to use as the
Formatter for the object(s) represented by the parameter(s) following the
string parameter.

It is a way of creating a string that contains data that is not of the
string type, without having to do a lot of formatting and concatenation to
do it. For example, let's say that you have a DateTime variable, and you
want to put the DateTime variable into a user-friendly string message in a
label on a Form. You could do something like the following:

DateTime d = DateTime.Now;
string s = "Today's date is ";
s += d.ToString("dd/MM/yyyy");

Using the static String.Format method, you can simply use:

string s = String.Format("Today's date is {0:dd/MM/yyyy}, DateTime.Now);

In other words, if you're really doing this to understand System.String, the
only thing you will learn about System.String from this is how the
String.Format method works, *not* how to use the String.Format method to
create a string containing a series of identical characters.

For more information, see:

http://msdn2.microsoft.com/en-us/library/fbxft59x.aspx
http://msdn2.microsoft.com/en-us/library/26etazsy.aspx
http://msdn2.microsoft.com/en-us/lib...em.string.aspx

--
HTH,

Kevin Spencer
Microsoft MVP
Ministry of Software Development
http://unclechutney.blogspot.com

Never trust a dunderhead with a blunderbuss.
"Lucky" <tu************@gmail.comwrote in message
news:11**********************@j72g2000cwa.googlegr oups.com...
hi guys!
back again with another query.
the problem is like this.

i want to print a line like this:
"---------------------------------------------"

the easiest way is to simply assign it to string and print it.
but i want to use the String.Format() method if possible to do it.

All i came to know about this method is, you can use
String.Format("{argumentIndex[,alignment][:formatString]}",argumentIndex)

do specify paddin and some format. but i dont get it how to provide the
formatstring. i guess it is for formating the argument if i'm not
wrong.
so guys, i need your help here.
i want to do something like this
String.Format("{0,40}","-")

this way it should return me the string filled with 40 dashes.

if there is any better way to do it, please let me know.
i'm trying to learn something about String object. Please help me.

Thanks,

Lucky

Nov 24 '06 #3

P: n/a
Please explain what IFormattable is i don't understand most of this,
and too am trying to learn as much as I can.

Thankyou

Nov 24 '06 #4

P: n/a
Hello Lucky,

I dont think with string.Format() you can get the output what you want.

Might be following page would be useful..
http://idunno.org/displayBlog.aspx/2004071401

You can pad the string with space with format function but repeating
the same character, am not sure !!

Regards,
Jigar mehta

Lucky wrote:
hi guys!
back again with another query.
the problem is like this.

i want to print a line like this:
"---------------------------------------------"

the easiest way is to simply assign it to string and print it.
but i want to use the String.Format() method if possible to do it.

All i came to know about this method is, you can use
String.Format("{argumentIndex[,alignment][:formatString]}",argumentIndex)

do specify paddin and some format. but i dont get it how to provide the
formatstring. i guess it is for formating the argument if i'm not
wrong.
so guys, i need your help here.
i want to do something like this
String.Format("{0,40}","-")

this way it should return me the string filled with 40 dashes.

if there is any better way to do it, please let me know.
i'm trying to learn something about String object. Please help me.

Thanks,

Lucky
Nov 24 '06 #5

P: n/a
ga********@myway.com wrote:
Please explain what IFormattable is i don't understand most of this,
and too am trying to learn as much as I can.
If you look up IFormattable in MSDN, there's lot of information there.

Jon

Nov 24 '06 #6

P: n/a
If you look at the 3 links I posted, the IFormattable interface, as well as
everything else I referred to, is explained in those references.

--
HTH,

Kevin Spencer
Microsoft MVP
Ministry of Software Development
http://unclechutney.blogspot.com

Never trust a dunderhead with a blunderbuss.
<ga********@myway.comwrote in message
news:11**********************@h54g2000cwb.googlegr oups.com...
Please explain what IFormattable is i don't understand most of this,
and too am trying to learn as much as I can.

Thankyou

Nov 24 '06 #7

P: n/a
* Lucky wrote, On 24-11-2006 13:33:
hi guys!
back again with another query.
the problem is like this.

i want to print a line like this:
"---------------------------------------------"

the easiest way is to simply assign it to string and print it.
but i want to use the String.Format() method if possible to do it.

All i came to know about this method is, you can use
String.Format("{argumentIndex[,alignment][:formatString]}",argumentIndex)

do specify paddin and some format. but i dont get it how to provide the
formatstring. i guess it is for formating the argument if i'm not
wrong.
so guys, i need your help here.
i want to do something like this
String.Format("{0,40}","-")

this way it should return me the string filled with 40 dashes.

if there is any better way to do it, please let me know.
i'm trying to learn something about String object. Please help me.
Lucy,

You could try:

string dashes = string.Empty.PadLeft(40,'-');

Jesse
Nov 24 '06 #8

P: n/a
I must say, very helping people around here. thanks everybody for your
informative replies. i learnt lot from your replies but i must
appriciate the replay from Google MSDN which was to the point.

Lucky

Mark Rae wrote:
"Lucky" <tu************@gmail.comwrote in message
news:11**********************@j72g2000cwa.googlegr oups.com...
if there is any better way to do it, please let me know.

string strRepeat = new String('-', 40);
i'm trying to learn something about String object. Please help me.

Google
MSDN
Dec 1 '06 #9

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