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  1. using System;
  2. using System.Linq;
  3.  
  4. abstract class Customer
  5.     {
  6.         public int id;
  7.         public string name;
  8.         public double balance;
  9.     }
  10.  
  11.     class NormalCustomer: Customer
  12.     {
  13.     }
  14.  
  15.     class SubscriberCustomer:Customer
  16.     {
  17.        public int LandMinutes;
  18.        public int MobileMinutes;
  19.     }
  20.  
  21. public class Test
  22. {
  23. 	public static void Main()
  24. 	{
  25. 	    Customer[] customers = new Customer[5];
  26.         customers[0]=new NormalCustomer();
  27.         customers[1] = new NormalCustomer();
  28.         customers[2] = new SubscriberCustomer();
  29.         customers[3] = new NormalCustomer();
  30.         customers[4] = new SubscriberCustomer(); 
  31.  
  32. 		var groupedCustomers = customers.GroupBy(c => c.GetType()).ToList();
  33.  
  34.         foreach(var type in groupedCustomers)
  35.         {
  36.            Console.WriteLine(type.Key.Name + ", count: " + type.Count());
  37.         }
  38. 	}
  39. }
Success #stdin #stdout 0.06s 24192KB
comments (?)
stdin 
Standard input is empty
stdout 
NormalCustomer, count: 3
SubscriberCustomer, count: 2
https://ideone.com/fz93H6
language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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