nasledovanie

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

namespace ConsoleApplication14
{
    class intList: System.Collections.ICollection
    {
        int count = 0;
        int[] M;
        const int defaultCapacity = 5;

        public intList(int capacity = defaultCapacity)
        {
            M = new int[capacity];
        }

        public int this[int i]
        {
            get { return M[i]; }
            set { M[i] = value; }
        }

        public int Capacity
        {
            get { return M.Length; }
            set
            {
                if (value < count) value = count;
                if (value != M.Length)
                {
                    int[] a = new int[value];
                    Array.Copy(M, 0, a, 0, count);
                    M = a;
                }
            }
        }

        public int Count
        {
            get { return count; }
        }

        public void Add(int x)
        {
            if (count == Capacity) Capacity = count * 2;
            M[count] = x;
            count++;
        }

        public System.Collections.IEnumerator GetEnumerator()
        {
            for (int i = 0; i < this.Count; i++)
            {
                yield return M[i];
            }
        }

        public bool IsSynchronized
        {
            get;
        }

        public object SyncRoot
        {
            get;
        }

        public void addRange(System.Collections.ICollection a)
        {
            int[] b = new int[a.Count];

            a.CopyTo(b, 0);

            for (int j = 0; j < a.Count; j++)
            {
                this.Add(b[j]);
            }
        }

        void System.Collections.ICollection.CopyTo(System.Array a, int y)
        {
            for (int i = 0; i < this.Count - y; i++)
            {
                a.SetValue(this[i + y], i);
            }
        }

        public void SetRange(int n, System.Collections.ICollection a)
        {
            int i = 0;

            foreach (var obj in a)
            {
                this[i+n] = (int) obj;
                i++;
            }
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            intList IL = new intList(10);
            IL.Add(1);
            IL.Add(2);
            IL.Add(3);
            intList IL1 = new intList(10);
            IL1.Add(4);
            IL1.Add(5);
            IL.addRange(IL1);
            IL.SetRange(0, IL1);
            Console.WriteLine("count = {0}", IL.Count);
            Console.WriteLine("capacity = {0}", IL.Capacity);
            for (int i = 0; i < IL.Count;i++)
            {
                Console.Write("{0, 5}", IL[i]);
            }
            Console.WriteLine();
            Console.ReadKey();
        }
    }
}