C# 数组的交集、差集、并集

工作中经常会用这方面的知识来检查那些字段是必须输入的，那些是禁止输入。

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5
 6 namespace Collection
 7 {
 8     class Program
 9     {
10         static void Main(string[] args)
11         {
12             int[] x = { 6,7,8,9,10};
13             int[] y = { 4,5,6,7,8};
14
15             var z1 = x.Except(y);
16             Console.WriteLine("Except: {0}",z1.Count());
17             foreach (var i in z1)
18             {
19                 Console.Write(i + " ");
20             }
21
22             var z2 = x.Intersect(y);
23             Console.WriteLine("\nIntersect:{0}",z2.Count());
24             foreach (var i in z2)
25             {
26                 Console.Write(i+" ");
27             }
28
29             var z3 = x.Union(y);
30             Console.WriteLine("\nUnion:{0}",z3.Count());
31             foreach (var i in z3)
32             {
33                 Console.Write(i + " ");
34             }
35             Console.ReadKey();
36         }
37     }
38 }