Cast

using System;/*from  ja va 2s.  c  o m*/
using System.Linq;

public class MainClass{
   public static void Main(){
            object[] doubles = {1.0, 2.0, 3.0};
            IEnumerable<double> d = doubles.Cast<double>();
            Console.Write(d);
   }
}

using System;/*from j  a  v  a  2s .c  om*/
using System.Collections;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        ArrayList classicList = new ArrayList();  // in System.Collections 
        classicList.AddRange(new int[] { 3, 4, 5 });
        IEnumerable<int> sequence1 = classicList.Cast<int>();
        foreach (int i in sequence1)
        {
            Console.WriteLine(i);
        }
    }
}

using System;//  j  a  va2  s .  c  o m
using System.Collections;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        ArrayList classicList = new ArrayList();  // in System.Collections 
        DateTime offender = DateTime.Now;
        classicList.Add(offender);
        IEnumerable<int> sequence1 = classicList.Cast<int>(); // Throws exception

        foreach (int i in sequence1)
        {
            Console.WriteLine(i);
        }
    }
}