String.Format 方法 (String, Object)
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方法的目的：将指定的 String 中的格式项替换为指定的 Object 实例的值的文本等效项。
public static string Format(string format,Object arg0)
// This code example demonstrates the String.Format() method.// Formatting for this example uses the "en-US" culture.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 = ""; Console.Clear();// Format a negative integer or floating-point number in various ways. Console.WriteLine("Standard Numeric Format Specifiers"); s = String.Format( "(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);//----0,1 Console.WriteLine(s);// Format the current date in various ways. Console.WriteLine("Standard DateTime Format Specifiers"); s = String.Format( "(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 full date/time: {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( "(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 code example produces the following results: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:. . . . . . . FFFFFF85Standard DateTime Format Specifiers(d) Short date: . . . . . . . 6/26/2004(D) Long date:. . . . . . . . Saturday, June 26, 2004(t) Short time: . . . . . . . 8:11 PM(T) Long time:. . . . . . . . 8:11:04 PM(f) Full date/short time: . . Saturday, June 26, 2004 8:11 PM(F) Full date/long time:. . . Saturday, June 26, 2004 8:11:04 PM(g) General date/short time:. 6/26/2004 8:11 PM(G) General date/long time: . 6/26/2004 8:11:04 PM (default):. . . . . . . . 6/26/2004 8:11:04 PM (default = 'G')(M) Month:. . . . . . . . . . June 26(R) RFC1123:. . . . . . . . . Sat, 26 Jun 2004 20:11:04 GMT(s) Sortable: . . . . . . . . 2004-06-26T20:11:04(u) Universal sortable: . . . 2004-06-26 20:11:04Z (invariant)(U) Universal full date/time: Sunday, June 27, 2004 3:11:04 AM(Y) Year: . . . . . . . . . . June, 2004Standard Enumeration Format Specifiers(G) General:. . . . . . . . . Green (default):. . . . . . . . Green (default = 'G')(F) Flags:. . . . . . . . . . Green (flags or integer)(D) Decimal number: . . . . . 3(X) Hexadecimal:. . . . . . . 00000003*/
