在 Visual C# .NET 中实现自定义集合

using System;
using System.Collections;

class TempClass
{
    public class CustomCollection : ICollection
    {

        private int[] intArr = { 1, 5, 9 };
        private int Ct;

        public CustomCollection()
        {
            Ct = 3;
        }
        void ICollection.CopyTo(Array myArr, int index)
        {

            foreach (int i in intArr)
            {
                myArr.SetValue(i, index);
                index = index + 1;
            }

        }
        IEnumerator IEnumerable.GetEnumerator()
        {
            return new Enumerator(intArr);
        }
        //The IsSynchronized Boolean property returns True if the 
        //collection is designed to be thread safe; otherwise, it returns False.
        bool ICollection.IsSynchronized
        {
            get
            {
                return false;
            }
        }

        //The SyncRoot property returns an object, which is used for synchronizing 
        //the collection.This returns the instance of the object or returns the 
        //SyncRoot of other collections if the collection contains other collections.
        // 
        object ICollection.SyncRoot
        {
            get
            {
                return this;
            }
        }

        //The Count read-only property returns the number 
        //of items in the collection.
        int ICollection.Count
        {
            get
            {
                return Ct;
            }
        }
    }
    public class Enumerator : IEnumerator
    {
        private int[] intArr;
        private int Cursor;
        public Enumerator(int[] intarr)
        {
            this.intArr = intarr;
            Cursor = -1;
        }
        void IEnumerator.Reset()
        {
            Cursor = -1;
        }
        bool IEnumerator.MoveNext()
        {
            if (Cursor < intArr.Length)
                Cursor++;

            return (!(Cursor == intArr.Length));
        }
        object IEnumerator.Current
        {
            get
            {
                if ((Cursor < 0) || (Cursor == intArr.Length))
                    throw new InvalidOperationException();
                return intArr[Cursor];
            }
        }
    }
    static void Main()
    {
        CustomCollection MyCol = new CustomCollection();

        foreach (object MyObj in MyCol)
            Console.WriteLine(MyObj.ToString());
    }
}