C#中的格式化字符源碼

一、數字

Specifier	String result	Datatype
C[n]	$XX,XX.XX	Currency
	($XX,XXX.XX)
D[n]	[-]XXXXXXX	Decimal
E[n] or e[n]	[-]X.XXXXXXE+xxx	Exponent
	[-]X.XXXXXXe+xxx
	[-]X.XXXXXXE-xxx
	[-]X.XXXXXXe-xxx
F[n]	[-]XXXXXXX.XX	Fixed point
G[n]	General or scientific	General
N[n]	[-]XX,XXX.XX	Number
X[n] or x[n]	Hex representation

1、This example uses numeric format specifiers without precision specifiers：

using System;
class TestDefaultFormats {
  static void Main( ) {
    int i = 654321;
    Console.WriteLine("{0:C}", i); // $654,321.00
    Console.WriteLine("{0:D}", i); // 654321
    Console.WriteLine("{0:E}", i); // 6.543210E+005
    Console.WriteLine("{0:F}", i); // 654321.00
    Console.WriteLine("{0:G}", i); // 654321
    Console.WriteLine("{0:N}", i); // 654,321.00
    Console.WriteLine("{0:X}", i); // 9FBF1
    Console.WriteLine("{0:x}", i); // 9fbf1
  }
}

2、This example uses numeric format specifiers with precision specifiers on a variety of int values:

using System;
class TestIntegerFormats {
  static void Main( ) {
    int i = 123;
    Console.WriteLine("{0:C6}", i); // $123.000000
    Console.WriteLine("{0:D6}", i); // 000123
    Console.WriteLine("{0:E6}", i); // 1.230000E+002
    Console.WriteLine("{0:G6}", i); // 123
    Console.WriteLine("{0:N6}", i); // 123.000000
    Console.WriteLine("{0:X6}", i); // 00007B
    i = -123;
    Console.WriteLine("{0:C6}", i); // ($123.000000)
    Console.WriteLine("{0:D6}", i); // -000123
    Console.WriteLine("{0:E6}", i); // -1.230000E+002
    Console.WriteLine("{0:G6}", i); // -123
    Console.WriteLine("{0:N6}", i); // -123.000000
    Console.WriteLine("{0:X6}", i); // FFFF85
    i = 0;
    Console.WriteLine("{0:C6}", i); // $0.000000
    Console.WriteLine("{0:D6}", i); // 000000
    Console.WriteLine("{0:E6}", i); // 0.000000E+000
    Console.WriteLine("{0:G6}", i); // 0
    Console.WriteLine("{0:N6}", i); // 0.000000
    Console.WriteLine("{0:X6}", i); // 000000
  }
}

3、This example uses numeric format specifiers with precision specifiers on a variety of double values:

using System;
class TestDoubleFormats {
  static void Main( ) {
    double d = 1.23;
    Console.WriteLine("{0:C6}", d); // $1.230000
    Console.WriteLine("{0:E6}", d); // 1.230000E+000
    Console.WriteLine("{0:G6}", d); // 1.23
    Console.WriteLine("{0:N6}", d); // 1.230000
    d = -1.23;
    Console.WriteLine("{0:C6}", d); // ($1.230000)
    Console.WriteLine("{0:E6}", d); // -1.230000E+000
    Console.WriteLine("{0:G6}", d); // -1.23
    Console.WriteLine("{0:N6}", d); // -1.230000
    d = 0;
    Console.WriteLine("{0:C6}", d); // $0.000000
    Console.WriteLine("{0:E6}", d); // 0.000000E+000
    Console.WriteLine("{0:G6}", d); // 0
    Console.WriteLine("{0:N6}", d); // 0.000000
  }
}

二、時間

Console.WriteLine("Standard DateTime Format Specifiers")
s = String.Format("(d) Short date: . . . . . . . {0:d}" & vbCrLf & _
                  "(D) Long date:. . . . . . . . {0:D}" & vbCrLf & _
                  "(t) Short time: . . . . . . . {0:t}" & vbCrLf & _
                  "(T) Long time:. . . . . . . . {0:T}" & vbCrLf & _
                  "(f) Full date/short time: . . {0:f}" & vbCrLf & _
                  "(F) Full date/long time:. . . {0:F}" & vbCrLf & _
                  "(g) General date/short time:. {0:g}" & vbCrLf & _
                  "(G) General date/long time: . {0:G}" & vbCrLf & _
                  "    (default):. . . . . . . . {0} (default = 'G')" & vbCrLf & _
                  "(M) Month:. . . . . . . . . . {0:M}" & vbCrLf & _
                  "(R) RFC1123:. . . . . . . . . {0:R}" & vbCrLf & _
                  "(s) Sortable: . . . . . . . . {0:s}" & vbCrLf & _
                  "(u) Universal sortable: . . . {0:u} (invariant)" & vbCrLf & _
                  "(U) Universal sortable: . . . {0:U}" & vbCrLf & _
                  "(Y) Year: . . . . . . . . . . {0:Y}" & vbCrLf, _
                  thisDate)