小花爸技術網站

using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace xCh3_4_31
{
    class Program
    {
        enum Color { Yellow = 1, Blue, Green }; // 定義Color列舉型別
        static DateTime thisDate = DateTime.Now; // 取得現在的時間

        static void Main(string[] args)
        {
            string s = "";

            Console.WriteLine("可用於數值(numeric)資料的格式化符指定符號");
            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);
            Console.WriteLine(s);

            Console.WriteLine("可用於日期(DateTime)資料的格式化符指定符號");
            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);

            Console.WriteLine("可用於列舉型別(Enumeration)資料的格式化符指定符號");
            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);
        }
    }
}