String.Format()方法
时间:2011-05-30 来源:King-两色天
String.Format方法是我们在.Net应用开发时经常使用到的,它的灵活使用有时能够达到事半功倍的效果,下面我们就借用MSDN上的一个示例来向大家展示String.Format的各种用法。
  该示例展示了Numeric、DateTime和Enumeration标准格式的使用,另外,我们也可以根据需要自定义我们需要的格式。
   
   
// This code example demonstrates the String.Format() method.
  using System;
  class Sample
  ...{
      enum Color ...{Yellow = 1, Blue, Green};
static DateTime thisDate = DateTime.Now;
      public static void Main()
      ...{
          // Store the output of the String.Format method in a string.
          string s = "";
          // Format a negative integer or floating-point number in various ways.
          Console.WriteLine("Standard Numeric Format Specifiers");
          s = String.Format(
              "(C) Currency: . . . . . . . . {0:C} " +
              "(D) Decimal:. . . . . . . . . {0:D} " +
              "(E) Scientific: . . . . . . . {1:E} " +
              "(F) Fixed point:. . . . . . . {1:F} " +
              "(G) General:. . . . . . . . . {0:G} " +
              "    (default):. . . . . . . . {0} (default = 'G') " +
              "(N) Number: . . . . . . . . . {0:N} " +
              "(P) Percent:. . . . . . . . . {1:P} " +
              "(R) Round-trip: . . . . . . . {1:R} " +
              "(X) Hexadecimal:. . . . . . . {0:X} ",
              -123, -123.45f);
          Console.WriteLine(s);
          // Format the current date in various ways.
          Console.WriteLine("Standard DateTime Format Specifiers");
          s = String.Format(
              "(d) Short date: . . . . . . . {0:d} " +
              "(D) Long date:. . . . . . . . {0:D} " +
              "(t) Short time: . . . . . . . {0:t} " +
              "(T) Long time:. . . . . . . . {0:T} " +
              "(f) Full date/short time: . . {0:f} " +
              "(F) Full date/long time:. . . {0:F} " +
              "(g) General date/short time:. {0:g} " +
              "(G) General date/long time: . {0:G} " +
              "    (default):. . . . . . . . {0} (default = 'G') " +
              "(M) Month:. . . . . . . . . . {0:M} " +
              "(R) RFC1123:. . . . . . . . . {0:R} " +
              "(s) Sortable: . . . . . . . . {0:s} " +
              "(u) Universal sortable: . . . {0:u} (invariant) " +
              "(U) Universal sortable: . . . {0:U} " +
              "(Y) Year: . . . . . . . . . . {0:Y} ",
              thisDate);
          Console.WriteLine(s);
          // Format a Color enumeration value in various ways.
          Console.WriteLine("Standard Enumeration Format Specifiers");
          s = String.Format(
              "(G) General:. . . . . . . . . {0:G} " +
              "    (default):. . . . . . . . {0} (default = 'G') " +
              "(F) Flags:. . . . . . . . . . {0:F} (flags or integer) " +
              "(D) Decimal number: . . . . . {0:D} " +
              "(X) Hexadecimal:. . . . . . . {0:X} ",
              Color.Green);      
          Console.WriteLine(s);
      }
  }
  以上代码的输出结果如下:
   
  Standard Numeric Format Specifiers
  (C) Currency: . . . . . . . . ¥-123.00
  (D) Decimal:. . . . . . . . . -123
  (E) Scientific: . . . . . . . -1.234500E+002
  (F) Fixed point:. . . . . . . -123.45
  (G) General:. . . . . . . . . -123
      (default):. . . . . . . . -123 (default = 'G')
  (N) Number: . . . . . . . . . -123.00
  (P) Percent:. . . . . . . . . -12,345.00%
  (R) Round-trip: . . . . . . . -123.45
  (X) Hexadecimal:. . . . . . . FFFFFF85
   
  Standard DateTime Format Specifiers
  (d) Short date: . . . . . . . 2007-1-29
  (D) Long date:. . . . . . . . 2007年1月29日
  (t) Short time: . . . . . . . 13:57
  (T) Long time:. . . . . . . . 13:57:42
  (f) Full date/short time: . . 2007年1月29日 13:57
  (F) Full date/long time:. . . 2007年1月29日 13:57:42
  (g) General date/short time:. 2007-1-29 13:57
  (G) General date/long time: . 2007-1-29 13:57:42
      (default):. . . . . . . . 2007-1-29 13:57:42 (default = 'G')
  (M) Month:. . . . . . . . . . 1月29日
  (R) RFC1123:. . . . . . . . . Mon, 29 Jan 2007 13:57:42 GMT
  (s) Sortable: . . . . . . . . 2007-01-29T13:57:42
  (u) Universal sortable: . . . 2007-01-29 13:57:42Z (invariant)
  (U) Universal sortable: . . . 2007年1月29日 5:57:42
  (Y) Year: . . . . . . . . . . 2007年1月
   
  Standard Enumeration Format Specifiers
  (G) General:. . . . . . . . . Green
      (default):. . . . . . . . Green (default = 'G')
  (F) Flags:. . . . . . . . . . Green (flags or integer)
  (D) Decimal number: . . . . . 3
  (X) Hexadecimal:. . . . . . . 00000003
  
  本文来自CSDN博客,转载请标明出处:http://blog.csdn.net/Charlie_Lee/archive/2007/01/29/1496999.aspx










