double[] numbers1 = { 2.0, 2.1, 2.2, 2.3, 2.4, 2.5 };
double[] numbers2 = { 2.2 };

// Get the numbers from the first array that
// are NOT in the second array.
IEnumerable<double> onlyInFirstSet =
    numbers1.AsQueryable().Except(numbers2);

foreach (double number in onlyInFirstSet)
    Console.WriteLine(number);

//引入命名空间
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;

public class MainClass{
   public static void Main(){
            int[] numbers = {1, 2, 3, 4};
            int[] numbers2 = {1, 1, 3, 3};
            Console.Write(numbers.Except(numbers2));
   }
}