/*

Read only access to ICollection<T>

IEnumerable + Count.

It is an IEnumerable that knows how many elements it has

*/

​

​

using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var daysOfWeek=new List<string>(){ "Monday",

                                      "Tuesday",

                                      "Wednesday",

                                      "Thursday",

                                      "Friday",

                                      "Saturday",

                                      "Sunday"

                                  };

        IReadOnlyCollection<string> collection =daysOfWeek;

        foreach(var item in collection)

                    Console.WriteLine("Day is "+item);

            Console.WriteLine("Count of elements "+collection.Count);

    }

}