C# 數組的交集、差集、並集

C# 數組的交集、差集、並集

工作中經常會用這方面的知識來檢查那些字段是必須輸入的，那些是禁止輸入。

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

namespace Collection
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] x = { 6,7,8,9,10};
            int[] y = { 4,5,6,7,8};

            var z1 = x.Except(y);
            Console.WriteLine("Except: {0}",z1.Count());
            foreach (var i in z1)
            {
                Console.Write(i + " ");
            }

            var z2 = x.Intersect(y);
            Console.WriteLine("\nIntersect:{0}",z2.Count());
            foreach (var i in z2)
            {
                Console.Write(i+" ");
            }

            var z3 = x.Union(y);
            Console.WriteLine("\nUnion:{0}",z3.Count());
            foreach (var i in z3)
            {
                Console.Write(i + " ");
            }
            Console.ReadKey();
        }
    }
}