LinQ转换运算符OfType

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace OfTypeDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            var numbers = new object[] { 1, "two", null, "3", 4 };
            foreach (var anInt in numbers.OfType<int>())
                Console.WriteLine(anInt);
            Console.ReadLine();
        }
    }
}