Почему не видна реализация ICompareble? - C#

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Формулировка задачи:

Вопрос почему при сортировке первого списка студия не видит мой метод Icompareble и как это исправить?
Листинг программы 
  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text;
  5. using System.Threading.Tasks;
  6. using System.Collections;
  7.  
  8. namespace ConsoleApplication19
  9. {
  10.     class AirlinesProperties : IComparable<AirlinesProperties>
  11.     {
  12.         public int number { set; get; }
  13.         public int arrivalTime { get; set; }
  14.  
  15.         public AirlinesProperties() { }
  16.         public AirlinesProperties(int number, int arrivalTime)
  17.         {
  18.             this.number = number;
  19.             this.arrivalTime = arrivalTime;
  20.  
  21.         }
  22.  
  23.         public int CompareTo(AirlinesProperties obj)
  24.         {
  25.             if (this.arrivalTime > obj.arrivalTime)
  26.                 return 1;
  27.             if (this.arrivalTime < obj.arrivalTime)
  28.                 return -1;
  29.             else
  30.                 return 0;
  31.         }
  32.         public override string ToString()
  33.         {
  34.             return String.Format(" {1}\tnumber: {2:C}\tarrivalTime: {3}%",
  35.                 this.arrivalTime, this.number);
  36.         }
  37.     }
  38.  
  39.     class Program
  40.     {
  41.         enum FlightType
  42.         {
  43.             flights,
  44.         }
  45.  
  46.         struct AirplanesProperties
  47.         {
  48.             public int number;
  49.             public string city;
  50.             public string airline;
  51.             public int terminal;
  52.             public int arrivalTime;
  53.             public int shippingFlight;
  54.             public int bgate;
  55.  
  56.             static void Main(string[] args)
  57.             {
  58.                 long a;
  59.                 Console.WriteLine(@"Please,  type the number:
  60.             1. arrivalTime1
  61.             2. udalenie elementa massiva
  62.             3. Poisk po aviakompanii
  63.             ");
  64.  
  65.                 a = long.Parse(Console.ReadLine());
  66.                 switch (a)
  67.                 {
  68.                     case 1:
  69.                         Arrivaltime1();
  70.                         Console.WriteLine("");
  71.                         break;
  72.  
  73.                     case 2:
  74.  
  75.                         Airline();
  76.                         Console.WriteLine("");
  77.                         break;
  78.  
  79.                     case 3:
  80.  
  81.                         gate();
  82.                         Console.WriteLine("");
  83.                         break;
  84.                     default:
  85.                         Console.WriteLine("Exit");
  86.                         break;
  87.  
  88.                 }
  89.                 Console.WriteLine("Press any key");
  90.                 Console.ReadLine();
  91.             }
  92.  
  93.             #region ArrivalTime1        
  94.             private static void Arrivaltime1()
  95.             {
  96.  
  97.                 int x;
  98.                 int y;
  99.                 int z;
  100.                 int k;
  101.  
  102.                 Console.WriteLine("arrivalTime1");
  103.                 x = Convert.ToInt32(Console.ReadLine());
  104.                 Console.WriteLine("arrivalTime2");
  105.                 y = Convert.ToInt32(Console.ReadLine());
  106.                 Console.WriteLine("arrivalTime3");
  107.                 z = Convert.ToInt32(Console.ReadLine());
  108.                 Console.WriteLine("arrivalTime4");
  109.                 k = Convert.ToInt32(Console.ReadLine());
  110.  
  111.                 List<AirplanesProperties> fligths = new List<AirplanesProperties>();
  112.                 fligths.Add(new AirplanesProperties { number = 1, arrivalTime = x, });
  113.                 fligths.Add(new AirplanesProperties { number = 2, arrivalTime = y, });
  114.                 fligths.Add(new AirplanesProperties { number = 3, arrivalTime = z, });
  115.                 fligths.Add(new AirplanesProperties { number = 4, arrivalTime = k, });
  116.  
  117.                 fligths.Sort();
  118.                 foreach (AirplanesProperties a in fligths)
  119.                     Console.WriteLine(a);
  120.             }
  121.             #endregion
  122.             // udalenie elementa massiva
  123.             #region Airline
  124.             private static void Airline()
  125.             {
  126.                 List<AirplanesProperties> fligth = new List<AirplanesProperties>();
  127.                 fligth.Add(new AirplanesProperties { number = 1, city = "kiyev", airline = "PAU", terminal = 1, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
  128.                 fligth.Add(new AirplanesProperties { number = 2, city = "kiyev", airline = "PAU", terminal = 1, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
  129.                 fligth.Add(new AirplanesProperties { number = 3, city = "Odessa", airline = "MAU", terminal = 3, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
  130.                 fligth.Add(new AirplanesProperties { number = 4, city = "Odessa", airline = "MAU", terminal = 5, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
  131.                 fligth.Add(new AirplanesProperties { number = 4, city = "Odessa", airline = "RAU", terminal = 5, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
  132.                 fligth.Add(new AirplanesProperties { number = 5, city = "Odessa", airline = "RAU", terminal = 5, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
  133.                 int n = Convert.ToInt32(Console.ReadLine());
  134.                 fligth = fligth.Where(x => x.number != n).ToList<AirplanesProperties>();
  135.                 foreach (AirplanesProperties x in fligth)
  136.                 {
  137.                     Console.WriteLine(x.airline + x.arrivalTime + x.bgate + x.city + x.number);
  138.                 }
  139.  
  140.             }
  141.             #endregion
  142.             //Poisk po aviakompanii
  143.             #region gate
  144.             private static void gate()
  145.             {
  146.  
  147.                 List<AirplanesProperties> fligth = new List<AirplanesProperties>();
  148.                 fligth.Add(new AirplanesProperties { number = 1, city = "kiyev", airline = "PAU", terminal = 1, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
  149.                 fligth.Add(new AirplanesProperties { number = 1, city = "kiyev", airline = "PAU", terminal = 1, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
  150.                 fligth.Add(new AirplanesProperties { number = 1, city = "Odessa", airline = "MAU", terminal = 3, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
  151.                 fligth.Add(new AirplanesProperties { number = 1, city = "Odessa", airline = "MAU", terminal = 5, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
  152.                 fligth.Add(new AirplanesProperties { number = 1, city = "Odessa", airline = "RAU", terminal = 5, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
  153.                 fligth.Add(new AirplanesProperties { number = 1, city = "Odessa", airline = "MAU", terminal = 5, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
  154.                 string z = Convert.ToString(Console.ReadLine());
  155.                 List<AirplanesProperties> result = fligth.Where(x => x.airline == z).ToList();
  156.                 foreach (AirplanesProperties x in result)
  157.                 {
  158.                     Console.WriteLine(x.airline + x.arrivalTime + x.bgate + x.city + x.number);
  159.                 }
  160.  
  161.             }
  162.         }
  163.         #endregion
  164.     }
  165. }

Решение задачи: «Почему не видна реализация ICompareble?»

textual
Листинг программы 
  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4.  
  5. class Program
  6. {
  7.     class AirplanesProperties : IComparable<AirplanesProperties>
  8.     {
  9.         public int Number { get; set; }
  10.         public int ArrivalTime { get; set; }
  11.         public string City { get; set; }
  12.         public string Airline { get; set; }
  13.         public int Terminal { get; set; }
  14.         public int ShippingFlight { get; set; }
  15.         public int Bgate { get; set; }
  16.  
  17.         public AirplanesProperties() { }
  18.         public AirplanesProperties(int number, int arrivalTime)
  19.         {
  20.             Number = number;
  21.             ArrivalTime = arrivalTime;
  22.         }
  23.  
  24.         public int CompareTo(AirplanesProperties obj)
  25.         {
  26.             if (ArrivalTime > obj.ArrivalTime)
  27.                 return 1;
  28.             else if (ArrivalTime < obj.ArrivalTime)
  29.                 return -1;
  30.  
  31.             return 0;
  32.         }
  33.  
  34.         public override string ToString()
  35.         {
  36.             return String.Format(" {1}\tnumber: {0:C}\tarrivalTime: ", ArrivalTime, Number);
  37.         }
  38.     }
  39.  
  40.     #region ArrivalTime1
  41.     private static void Arrivaltime1()
  42.     {
  43.         int x, y, z, k;
  44.         Console.WriteLine("arrivalTime1");
  45.         x = Convert.ToInt32(Console.ReadLine());
  46.         Console.WriteLine("arrivalTime2");
  47.         y = Convert.ToInt32(Console.ReadLine());
  48.         Console.WriteLine("arrivalTime3");
  49.         z = Convert.ToInt32(Console.ReadLine());
  50.         Console.WriteLine("arrivalTime4");
  51.         k = Convert.ToInt32(Console.ReadLine());
  52.  
  53.         List<AirplanesProperties> fligths = new List<AirplanesProperties>()
  54.             {
  55.                 new AirplanesProperties { Number = 1, ArrivalTime = x, },
  56.                 new AirplanesProperties { Number = 2, ArrivalTime = y, },
  57.                 new AirplanesProperties { Number = 3, ArrivalTime = z, },
  58.                 new AirplanesProperties { Number = 4, ArrivalTime = k, }
  59.             };
  60.         fligths.Sort();
  61.         foreach (var item in fligths)
  62.             Console.WriteLine(item);
  63.     }
  64.     #endregion
  65.  
  66.     #region Airline
  67.     private static void Airline()
  68.     {
  69.         List<AirplanesProperties> fligth = new List<AirplanesProperties>()
  70.         {
  71.             new AirplanesProperties { Number = 1, City = "kiyev", Airline = "PAU", Terminal = 1, ArrivalTime = 0, ShippingFlight = 0, Bgate = 1 },
  72.             new AirplanesProperties { Number = 2, City = "kiyev", Airline = "PAU", Terminal = 1, ArrivalTime = 0, ShippingFlight = 0, Bgate = 1 },
  73.             new AirplanesProperties { Number = 3, City = "Odessa", Airline = "MAU", Terminal = 3, ArrivalTime = 0, ShippingFlight = 0, Bgate = 1 },
  74.             new AirplanesProperties { Number = 4, City = "Odessa", Airline = "MAU", Terminal = 5, ArrivalTime = 0, ShippingFlight = 0, Bgate = 1 },
  75.             new AirplanesProperties { Number = 4, City = "Odessa", Airline = "RAU", Terminal = 5, ArrivalTime = 0, ShippingFlight = 0, Bgate = 1 },
  76.             new AirplanesProperties { Number = 5, City = "Odessa", Airline = "RAU", Terminal = 5, ArrivalTime = 0, ShippingFlight = 0, Bgate = 1 }
  77.         };
  78.         int n = Convert.ToInt32(Console.ReadLine());
  79.         var filterFlight = fligth.Where(x => x.Number != n);
  80.         foreach (var x in filterFlight)
  81.         {
  82.             Console.WriteLine(x.Airline + x.ArrivalTime + x.Bgate + x.City + x.Number);
  83.         }
  84.     }
  85.     #endregion
  86.  
  87.     #region gate
  88.     private static void gate()
  89.     {
  90.         List<AirplanesProperties> fligth = new List<AirplanesProperties>()
  91.         {
  92.             new AirplanesProperties { Number = 1, City = "kiyev", Airline = "PAU", Terminal = 1, ArrivalTime = 0, ShippingFlight = 0, Bgate = 1 },
  93.             new AirplanesProperties { Number = 1, City = "kiyev", Airline = "PAU", Terminal = 1, ArrivalTime = 0, ShippingFlight = 0, Bgate = 1 },
  94.             new AirplanesProperties { Number = 1, City = "Odessa", Airline = "MAU", Terminal = 3, ArrivalTime = 0, ShippingFlight = 0, Bgate = 1 },
  95.             new AirplanesProperties { Number = 1, City = "Odessa", Airline = "MAU", Terminal = 5, ArrivalTime = 0, ShippingFlight = 0, Bgate = 1 },
  96.             new AirplanesProperties { Number = 1, City = "Odessa", Airline = "RAU", Terminal = 5, ArrivalTime = 0, ShippingFlight = 0, Bgate = 1 },
  97.             new AirplanesProperties { Number = 1, City = "Odessa", Airline = "MAU", Terminal = 5, ArrivalTime = 0, ShippingFlight = 0, Bgate = 1 }
  98.         };
  99.         string z = Console.ReadLine();
  100.         var result = fligth.Where(x => x.Airline == z);
  101.         foreach (var x in result)
  102.         {
  103.             Console.WriteLine(x.Airline + x.ArrivalTime + x.Bgate + x.City + x.Number);
  104.         }
  105.     }
  106.     #endregion
  107.  
  108.     static void Main()
  109.     {
  110.         Console.WriteLine(@"Please,  type the number:
  111.             1. arrivalTime1
  112.             2. udalenie elementa massiva
  113.             3. Poisk po aviakompanii
  114.             ");
  115.         int a = int.Parse(Console.ReadLine());
  116.         switch (a)
  117.         {
  118.             case 1:
  119.                 Arrivaltime1();
  120.                 Console.WriteLine("");
  121.                 break;
  122.             case 2:
  123.  
  124.                 Airline();
  125.                 Console.WriteLine("");
  126.                 break;
  127.             case 3:
  128.                 gate();
  129.                 Console.WriteLine("");
  130.                 break;
  131.             default:
  132.                 Console.WriteLine("Exit");
  133.                 break;
  134.         }
  135.         Console.ReadKey();
  136.     }
  137. }

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