String..::.Format 方法 (IFormatProvider, String, array[]()[])
// This code example demonstrates the String.Format() method.
// Formatting for this example uses the "en-US" culture.
using System;
using System.Globalization;
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 = "";
Console.Clear();
// Format a negative integer or floating-point number in various ways.
Console.WriteLine("Standard Numeric Format Specifiers");
s = String.Format(CultureInfo.InvariantCulture,
"(C) Currency: . . . . . . . . {0:C}/n" +
"(D) Decimal:. . . . . . . . . {0:D}/n" +
"(E) Scientific: . . . . . . . {1:E}/n" +
"(F) Fixed point:. . . . . . . {1:F}/n" +
"(G) General:. . . . . . . . . {0:G}/n" +
" (default):. . . . . . . . {0} (default = 'G')/n" +
"(N) Number: . . . . . . . . . {0:N}/n" +
"(P) Percent:. . . . . . . . . {1:P}/n" +
"(R) Round-trip: . . . . . . . {1:R}/n" +
"(X) Hexadecimal:. . . . . . . {0:X}/n",
-123, -123.45f);
Console.WriteLine(s);
// Format the current date in various ways.
Console.WriteLine("Standard DateTime Format Specifiers");
s = String.Format(CultureInfo.InvariantCulture.DateTimeFormat,
"(d) Short date: . . . . . . . {0:d}/n" +
"(D) Long date:. . . . . . . . {0:D}/n" +
"(t) Short time: . . . . . . . {0:t}/n" +
"(T) Long time:. . . . . . . . {0:T}/n" +
"(f) Full date/short time: . . {0:f}/n" +
"(F) Full date/long time:. . . {0:F}/n" +
"(g) General date/short time:. {0:g}/n" +
"(G) General date/long time: . {0:G}/n" +
" (default):. . . . . . . . {0} (default = 'G')/n" +
"(M) Month:. . . . . . . . . . {0:M}/n" +
"(R) RFC1123:. . . . . . . . . {0:R}/n" +
"(s) Sortable: . . . . . . . . {0:s}/n" +
"(u) Universal sortable: . . . {0:u} (invariant)/n" +
"(U) Universal sortable: . . . {0:U}/n" +
"(Y) Year: . . . . . . . . . . {0:Y}/n",
thisDate);
Console.WriteLine(s);
// Format a Color enumeration value in various ways.
Console.WriteLine("Standard Enumeration Format Specifiers");
s = String.Format(CultureInfo.InvariantCulture,
"(G) General:. . . . . . . . . {0:G}/n" +
" (default):. . . . . . . . {0} (default = 'G')/n" +
"(F) Flags:. . . . . . . . . . {0:F} (flags or integer)/n" +
"(D) Decimal number: . . . . . {0:D}/n" +
"(X) Hexadecimal:. . . . . . . {0:X}/n",
Color.Green);
Console.WriteLine(s);
}
}
/*
This example displays the following output to the console:
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: . . . . . . . 07/09/2007
(D) Long date:. . . . . . . . Monday, 09 July 2007
(t) Short time: . . . . . . . 13:48
(T) Long time:. . . . . . . . 13:48:05
(f) Full date/short time: . . Monday, 09 July 2007 13:48
(F) Full date/long time:. . . Monday, 09 July 2007 13:48:05
(g) General date/short time:. 07/09/2007 13:48
(G) General date/long time: . 07/09/2007 13:48:05
(default):. . . . . . . . 07/09/2007 13:48:05 (default = 'G')
(M) Month:. . . . . . . . . . July 09
(R) RFC1123:. . . . . . . . . Mon, 09 Jul 2007 13:48:05 GMT
(s) Sortable: . . . . . . . . 2007-07-09T13:48:05
(u) Universal sortable: . . . 2007-07-09 13:48:05Z (invariant)
(U) Universal sortable: . . . Monday, 09 July 2007 20:48:05
(Y) Year: . . . . . . . . . . 2007 July
Standard Enumeration Format Specifiers
(G) General:. . . . . . . . . Green
(default):. . . . . . . . Green (default = 'G')
(F) Flags:. . . . . . . . . . Green (flags or integer)
(D) Decimal number: . . . . . 3
(X) Hexadecimal:. . . . . . . 00000003
*/