String.Format()方法

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

posted @ 2011-05-30 10:25  两色天  阅读(430)  评论(0编辑  收藏  举报