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==Formatting Using the R Format Specifier==

<source lang="csharp">class MainClass
{
static void Main()
{
const double number = 1.612;
double result;
string text;
text = string.Format("{0}", number);
result = double.Parse(text);
System.Console.WriteLine("{0}: result != number",result != number);
text = string.Format("{0:R}", number);
result = double.Parse(text);
System.Console.WriteLine("{0}: result == number",result == number);
}
}</source>

==.NET String Format Characters==

<source lang="csharp">String Format Character Meaning in Life
C or c format currency.
D or d format decimal numbers.
E or e Used for exponential notation.
F or f Used for fixed-point formatting.
G or g Stands for general.
N or n numerical formatting.
X or x hexadecimal formatting.</source>

==String and WriteLine Format Specifiers==

<source lang="csharp">Character Interpretation
C or c Currency
D or d Decimal
E or e Exponent
F or f Fixed point
G or g General
N or n Number; similar to F with the addition of comma thousand separators
P or p Percentage
R or r Round-trip
X or x Hex</source>

==String format: {0,3:D}, {1,8:D}==

<source lang="csharp">using System;

class MainClass {
public static void Main() {
int sum = 0, prod = 1;
for(int i=1; i <= 10; i++) {
sum += i;
prod *= i;
string str = String.Format("Sum:{0,3:D} Product:{1,8:D}",
sum, prod);
Console.WriteLine(str);
}
}
}</source>
<pre class=codeResult>Sum: 1 Product: 1
Sum: 3 Product: 2
Sum: 6 Product: 6
Sum: 10 Product: 24
Sum: 15 Product: 120
Sum: 21 Product: 720
Sum: 28 Product: 5040
Sum: 36 Product: 40320
Sum: 45 Product: 362880
Sum: 55 Product: 3628800</pre>

==String format: {0:C}==

<source lang="csharp">using System;

class MainClass
{
public static void Main(string[] args)
{
string formStr = null;
formStr = string.Format("you had {0:C} in your account?", 99989.987);
Console.WriteLine(formStr);
}
}</source>
<pre class=codeResult>you had $99,989.99 in your account?</pre>

==Use String.Format() to format a value.==

<source lang="csharp">using System;

class MainClass {
public static void Main() {
double v = 17688.65849;
double v2 = 0.15;
int x = 21;
string str = String.Format("{0:F2}", v);
Console.WriteLine(str);
str = String.Format("{0:N5}", v);
Console.WriteLine(str);

str = String.Format("{0:e}", v);
Console.WriteLine(str);

str = String.Format("{0:r}", v);
Console.WriteLine(str);

str = String.Format("{0:p}", v2);
Console.WriteLine(str);

str = String.Format("{0:X}", x);
Console.WriteLine(str);
str = String.Format("{0:D12}", x);
Console.WriteLine(str);
str = String.Format("{0:C}", 189.99);
Console.WriteLine(str);
}
}</source>
<pre class=codeResult>17688.66
17,688.65849
1.768866e+004
17688.65849
15.00 %
15
000000000021
$189.99</pre>

==Use ToString to format double: C==

<source lang="csharp">using System;

class MainClass {
public static void Main() {
string str = 189.99.ToString("C");
Console.WriteLine(str);
}
}</source>
<pre class=codeResult>$189.99</pre>

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в 15:31, 26 мая 2010

Admin: 1 версия