计算从哪天起应该购买预售火车票.cs

代码直接CSC编译即可。

计算从哪天起应该购买预售火车票.cs

 using System;
 using System.Diagnostics;
 using System.IO;

 class Program
 {
     static ConsoleColor DefaultForegroundColor = Console.ForegroundColor; //保留Console前景色

     static int Main(params string[] args)
     {
         int days = ; //预售天数
         if (args.Length>)
         {
             if(!int.TryParse(args[], out days))
             {
                 ShowHelpAndExit(); //第一个参数错误
             }
             else if(args.Length>)
             {
                 DateTime argsDate; //出行日期
                 if(args[].Trim().Equals("now",StringComparison.OrdinalIgnoreCase))
                 {
                     argsDate = DateTime.Now.AddDays(days - ); //出行日期为now的话，计算出今天可预订的出行日期
                 }
                 else if(!DateTime.TryParse(args[], out argsDate))
                 {
                     ShowHelpAndExit(); //第二个参数错误
                 }
                 Console.WriteLine("\r\n * 火车票预售期为：{0}天\r\n\r\n出行日期：{1}",days, FormatDate(argsDate));
                 OutputBookingDay(days, argsDate); //输出预售日期
                 var paused = true;
                 if(args.Length>)
                 {
                     if(args[].Trim().Equals("nopause",StringComparison.OrdinalIgnoreCase))
                     {
                         paused = false; //第三个参数为 nopause 则不暂停直接退出，用于配合命令提示符
                     }
                 }
                 if(paused)
                 {
                     Console.Write("\r\n按任意键退出...");
                     Console.ReadKey(true);
                 }
                 Environment.Exit(); //正常退出
             }
         }
         else
         {
             Console.WriteLine("计算从哪天起应该购买预售火车票"); //未带参数，输出标题
             Console.WriteLine();
         }
         if(days <= )
         {
             Console.Write("火车票预售期（缺省为60天）：");
             var input=Console.ReadLine().Trim();  //手动输入预售期
             inputToExit(input);
             if (!int.TryParse(input, out days)||days<=)
             {
                 days = ; //输入错误，预售期设置为60天
                 ConsoleCursorRelativeLine(-); //光标移动到上一行行首。
                 var point = ConsoleCursorGetCurrentPosition();
                 if(point!=null)
                 {
                     ConsoleCursorFillLines(point.Value.Top,point.Value.Top, ' '); //清除光标所在行的显示字符（用空格填充）
                     Console.Write("火车票预售期（缺省为60天）：{0}\r\n", days);
                 }
             }
         }
         Console.WriteLine("\r\n * 火车票预售期为：{0}天",days);
         Console.WriteLine(" * 今天可以预定 {0} 的火车票", FormatDate(DateTime.Now.AddDays(days - )));
         Console.WriteLine(" * 输入\"exit\"可退出程序，输入\"g\"打开12306订票网站。\r\n");
         while(true)
         {
             Console.Write("出行日期：");  //输入出行日期
             var input = Console.ReadLine().Trim();
             inputToExit(input);  //若输入exit则退出
             if(input.Equals("g",StringComparison.OrdinalIgnoreCase))
             {
                 const string web = "http://www.12306.cn";
                 Process.Start(web); //输入g打开12306网站
                 Console.WriteLine("正在打开 {0} ", web);
             }
             else
             {
                 DateTime dest;
                 if(DateTime.TryParse(input, out dest))
                 {
                     ConsoleCursorRelativeLine(-);
                     var point = ConsoleCursorGetCurrentPosition();
                     if(point!=null)
                     {
                         ConsoleCursorFillLines(point.Value.Top,point.Value.Top, ' '); //清除前一行显示字符
                         Console.WriteLine("出行日期：{0}",FormatDate(dest)); //更新输出日期
                     }
                     OutputBookingDay(days, dest);
                 }
                 else
                 {
                     Console.ForegroundColor = ConsoleColor.Red;
                     Console.WriteLine("输入错误"); //显示输出错误
                     Console.ForegroundColor = DefaultForegroundColor;
                     ConsoleCursorRelativeLine(-); //光标向上移动3行
                     var point = ConsoleCursorGetCurrentPosition();
                     if(point!=null)
                     {
                         ConsoleCursorFillLines(point.Value.Top,point.Value.Top+, ' ');
                     }
                 }
             }
             Console.WriteLine();
         }
     }

     static void inputToExit(string input)
     {
         if(input.Equals("exit", StringComparison.OrdinalIgnoreCase))
         {
              Environment.Exit(); //用户退出
         }
     }

     static void ShowHelp()
     {
         //帮助提示
         var appname = Path.GetFileName(Environment.GetCommandLineArgs()[]);
         Console.WriteLine(" * 参数格式：");
         Console.WriteLine("   {0} <火车票预售期>", appname);
         Console.WriteLine("   {0} <火车票预售期> <出行日期> [nopause]", appname);
         Console.WriteLine("   {0} <火车票预售期> now [nopause]", appname);
         Console.WriteLine("\r\n * 例子：预售期60天，查看今天可以预定哪天火车票");
         Console.WriteLine("   {0} 60 now", appname);
         Console.WriteLine("\r\n * 批处理：");
         Console.WriteLine("   {0} 60 now nopause|Find \"出行日期：\"", appname);
         Console.WriteLine();
     }

     static void ShowHelpAndExit(int exitcode)
     {
         ShowHelp(); //显示帮助提示然后按任意键退出
         Console.Write("按任意键退出...");
         Console.ReadKey(true);
         Environment.Exit(exitcode); //返回错误码(errorlevel)
     }

     static string FormatDate(DateTime date)
     {
         ConsoleColor? cc;
         return FormatDate(date, out cc); //格式化日期
     }

     static string[] dayOfWeek = new []{ "周日", "周一", "周二", "周三", "周四", "周五", "周六" };
     static string FormatDate(DateTime date, out ConsoleColor? consoleColor)
     {
         var d = (date.Date - DateTime.Now.Date).Days;
         string tip;
         switch (d)
         {
             case -:
                 tip = "（前天）";
                 break;
             case -:
                 tip = "（昨天）";
                 break;
             case :
                 tip = "（今天）";
                 break;
             case :
                 tip = "（明天）";
                 break;
             case :
                 tip = "（后天）";
                 break;
             default:
                 tip = string.Format("（{0}）",dayOfWeek[(int)date.DayOfWeek]);
                 break;
         }

         if (d>=)
         {
             consoleColor = ConsoleColor.Green;  //返回建议颜色，下同
         }
         else
         {
             consoleColor = ConsoleColor.Yellow;
         }

         return string.Format("{0:yyyy-M-d}{1}", date, tip);
     }

     static void OutputBookingDay(int days, DateTime destDate)
     {
         var date = destDate.AddDays(-days + );
         ConsoleColor? cc;
         var formattedDest = FormatDate(date, out cc);
         Console.ForegroundColor = DefaultForegroundColor;
         Console.Write("预售日期："); //用缺省前景色显示“预售日期：”这几个字
         if(cc.HasValue)
         {
             Console.ForegroundColor = cc.Value; //更换前景色
         }
         Console.WriteLine(formattedDest); //按格式输出预售日期
         Console.ForegroundColor = DefaultForegroundColor; //还原缺省前景色
     }

     static bool ConsoleCursorRelativeLine(int rows)
     {
         //将ConsoleCursor操作封装成方法，加入try语句，防止在非控制台下输出造成异常，下同
         try
         {
             var t = Console.CursorTop + rows; //相对行号
             Console.SetCursorPosition(, t); //移动光标到相对行
             return true; //成功
         }
         catch
         {
         }
         return false; //失败
     }

     static bool ConsoleCursorFillLines(int startLine, int endLine, char @char)
     {
         var d = endLine - startLine + ;
         if (d>)
         {
             try
             {
                 var point = ConsoleCursorGetCurrentPosition().Value;
                 Console.SetCursorPosition(, startLine); //光标移动到起始行
                 Console.Write(new string(@char,Console.BufferWidth * d)); //用字符填满指定行数(d)
                 Console.SetCursorPosition(point.Left, point.Top); //返回光标原来的位置
                 return true; //成功
             }
             catch
             {
             }
         }
         return false; //失败
     }

     static Point? ConsoleCursorGetCurrentPosition()
     {
         try
         {
             return new Point(Console.CursorLeft, Console.CursorTop); //返回光标位置
         }
         catch
         {
         }
         return null; //失败
     }

     struct Point
     {
         public int Left;
         public int Top;

         public Point(int left, int top)
         {
             Left = left;
             Top = top;
         }
     }
 }