String.Format()方法

// 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


string.Format("{0}//{1}", m_strAssemblyPath, FilePath)前以个字符串和后以个字符串实现了自己定义的合并方式。这是string.Format（） 方法提供给我们的又以个好处！