Meidianto

Formatting String in C#

2008-10-29T08:32:00Z

Below is a quick reference for someone that too lazy to open MSDN Library (like me) or other resources in the internet.

Bookmark this page if it is useful for you.

Strings

There really isn’t any formatting within a string, beyond it’s alignment. Alignment works for any argument being printed in a String.Format call.

Sample	Generates
String.Format(”->{1,10}<-”, “Hello”);	-> Hello<-
String.Format(”->{1,-10}<-”, “Hello”);	->Hello <-

Numbers

Basic number formatting specifiers:

Specifier	Type	Format	Output (Passed Double 1.42)	Output (Passed Int -12400)
c	Currency	{0:c}	$1.42	-$12,400
d	Decimal (Whole number)	{0:d}	System.FormatException	-12400
e	Scientific	{0:e}	1.420000e+000	-1.240000e+004
f	Fixed point	{0:f}	1.42	-12400.00
g	General	{0:g}	1.42	-12400
n	Number with commas for thousands	{0:n}	1.42	-12,400
r	Round trippable	{0:r}	1.42	System.FormatException
x	Hexadecimal	{0:x4}	System.FormatException	cf90

Custom number formatting:

Specifier	Type	Example	Output (Passed Double 1500.42)	Note
0	Zero placeholder	{0:00.0000}	1500.4200	Pads with zeroes.
#	Digit placeholder	{0:(#).##}	(1500).42
.	Decimal point	{0:0.0}	1500.4
,	Thousand separator	{0:0,0}	1,500	Must be between two zeroes.
,.	Number scaling	{0:0,.}	2	Comma adjacent to Period scales by 1000.
%	Percent	{0:0%}	150042%	Multiplies by 100, adds % sign.
e	Exponent placeholder	{0:00e+0}	15e+2	Many exponent formats available.
;	Group separator	see below

The group separator is especially useful for formatting currency values which require that negative values be enclosed in parentheses. This currency formatting example at the bottom of this document makes it obvious:

Dates

Note that date formatting is especially dependant on the system’s regional settings; the example strings here are from my local locale.

Specifier	Type	Example (Passed System.DateTime.Now)
d	Short date	10/12/2002
D	Long date	December 10, 2002
t	Short time	10:11 PM
T	Long time	10:11:29 PM
f	Full date & time	December 10, 2002 10:11 PM
F	Full date & time (long)	December 10, 2002 10:11:29 PM
g	Default date & time	10/12/2002 10:11 PM
G	Default date & time (long)	10/12/2002 10:11:29 PM
M	Month day pattern	December 10
r	RFC1123 date string	Tue, 10 Dec 2002 22:11:29 GMT
s	Sortable date string	2002-12-10T22:11:29
u	Universal sortable, local time	2002-12-10 22:13:50Z
U	Universal sortable, GMT	December 11, 2002 3:13:50 AM
Y	Year month pattern	December, 2002

The ‘U’ specifier seems broken; that string certainly isn’t sortable.

Custom date formatting:

Specifier	Type	Example	Example Output
dd	Day	{0:dd}	10
ddd	Day name	{0:ddd}	Tue
dddd	Full day name	{0:dddd}	Tuesday
f, ff, …	Second fractions	{0:fff}	932
gg, …	Era	{0:gg}	A.D.
hh	2 digit hour	{0:hh}	10
HH	2 digit hour, 24hr format	{0:HH}	22
mm	Minute 00-59	{0:mm}	38
MM	Month 01-12	{0:MM}	12
MMM	Month abbreviation	{0:MMM}	Dec
MMMM	Full month name	{0:MMMM}	December
ss	Seconds 00-59	{0:ss}	46
tt	AM or PM	{0:tt}	PM
yy	Year, 2 digits	{0:yy}	02
yyyy	Year	{0:yyyy}	2002
zz	Timezone offset, 2 digits	{0:zz}	-05
zzz	Full timezone offset	{0:zzz}	-05:00
:	Separator	{0:hh:mm:ss}	10:43:20
/	Separator	{0:dd/MM/yyyy}	10/12/2002

Enumerations

Specifier	Type
g	Default (Flag names if available, otherwise decimal)
f	Flags always
d	Integer always
x	Eight digit hex.

Some Useful Examples

String.Format(”{0:$#,##0.00;($#,##0.00);Zero}”, value);

This will output “$1,240.00″ if passed 1243.50. It will output the same format but in parentheses if the number is negative, and will output the string “Zero” if the number is zero.

String.Format(”{0:(###) ###-####}”, 8005551212);

This will output “(800) 555-1212″.

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Usefull Password/Key Generator

2008-07-20T11:08:00Z

For anyone who needs a perfect (maybe just good for me - nothing is perfect) password or key for hashing, there is a usefull tool published by Gibson Research Corporation.

You can find the tool at https://www.grc.com/passwords.htm

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5 Big Security Threats

2008-07-20T10:08:00Z

Traditional anti-virus software and firewalls miss these five current threats.

1 Trusted Users and Partners
These individuals have access to your most sensitive data. Without additional monitoring and policy enforcement technology in place, organizations are left flapping in the wind.

2 Web Application Vulnerabilities
Gartner estimates that 75 percent of today’s attacks are carried out through the application layer. Many of these application attacks are conducted through quickly coded Web applications, with little or no security baked in. Yet these Web apps are often connected to some of the most sensitive databases businesses own.

3 Missing Devices
Whether lost or stolen, unencrypted laptops and other mobile devices have the potential to expose your organization to high-profile data breaches if they contain sensitive information.

4 Custom Malware
Most security experts agree that signature-based anti-virus systems are overwhelmed by the proliferation of malware designed to fly under the radar of established signatures to attack systems and steal data. Signature-based protection cannot protect against custom malware that has never been detected before.

5 Social Engineering
When users provide log-in information to a “tech support” guy who doesn’t exist, or they unknowingly respond to spear-phishing attempts to steal their credentials, the bad guys gain unfettered access to your systems. These tricky attacks that prey on user ignorance must be headed off through education, policy creation and enforcement measures.

To read the full article please go to http://www.baselinemag.com/c/a/Security/Closing-the-Security-Gap/5/

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