C#|两个散列集的交集-yiteyi-C++库

A. 哈希集 是独特元素的无序集合。它是在 系统收藏。通用的 名称空间。它用于我们希望防止在集合中插入重复项的情况。就性能而言，它比列表要好。 哈希集 .与（IEnumerable）相交 )方法 用于修改当前 哈希集 对象只包含该对象和指定集合中存在的元素。

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语法：

mySet1.IntersectWith(mySet2)

在这里 mySet1 和 mySet2 这是两个哈希集。

例外情况： 这种方法会给你 无理例外 如果HashSet是 无效的 .

下面给出了一些例子，以更好地理解实施：

例1：

                     // C# code to find Intersection                   
                     //of two HashSets                   
                     using                               System;                   
                     using                               System.Collections.Generic;                   
                             
                     class                               GFG {                   
                             
                                         // Driver code                   
                                         public                               static                               void                               Main()                   
                                         {                   
                             
                                         // Creating a HashSet of integers                   
                                         HashSet<                               int                               > mySet1 =                               new                               HashSet<                               int                               >();                   
                             
                                         // Creating a HashSet of integers                   
                                         HashSet<                               int                               > mySet2 =                               new                               HashSet<                               int                               >();                   
                             
                                         // Inserting even numbers less than                   
                                         // equal to 10 in HashSet mySet1                   
                                         Console.WriteLine(                               "Elements in Set 1 :"                               );                   
                             
                                         for                               (                               int                               i = 0; i < 5; i++) {                   
                                         mySet1.Add(i * 2);                   
                                         Console.WriteLine(i * 2);                   
                                         }                   
                             
                                         // Inserting odd numbers less than                   
                                         // equal to 10 in HashSet mySet2                   
                                         Console.WriteLine(                               "Elements in Set 2 : "                               );                   
                                         for                               (                               int                               i = 0; i < 5; i++) {                   
                                         mySet1.Add(i * 2 + 1);                   
                                         Console.WriteLine(i *2 + 1);                   
                                         }                   
                             
                                         // Creating a new HashSet that contains                   
                                         // the Intersection of both the HashSet mySet1 & mySet2                   
                                         HashSet<                               int                               > ans =                               new                               HashSet<                               int                               >(mySet1);                   
                             
                                         ans.IntersectWith(mySet2);                   
                             
                                         // Printing the Intersection of both the HashSets                   
                                         // It should show no element in the output                   
                                         // as there is no element common in both                   
                                         // the HashSets                   
                                         foreach                               (                               int                               i                               in                               ans)                   
                                         {                   
                                         Console.WriteLine(i);                   
                                         }                   
                                         }                   
                     }                   

输出：

Elements in Set 1 :
0
2
4
6
8
Elements in Set 2 : 
1
3
5
7
9

例2：

                     // C# code to find Intersection                   
                     // of two HashSets                   
                     using                               System;                   
                     using                               System.Collections.Generic;                   
                             
                     class                               GFG {                   
                             
                                         // Driver code                   
                                         public                               static                               void                               Main()                   
                                         {                   
                             
                                         // Creating a HashSet of strings                   
                                         HashSet<                               string                               > mySet1 =                               new                               HashSet<                               string                               >();                   
                             
                                         // Creating a HashSet of strings                   
                                         HashSet<                               string                               > mySet2 =                               new                               HashSet<                               string                               >();                   
                             
                                         // Inserting elements in mySet1                   
                                         mySet1.Add(                               "Hello"                               );                   
                                         mySet1.Add(                               "Geeks"                               );                   
                                         mySet1.Add(                               "GeeksforGeeks"                               );                   
                             
                                         // Inserting elements in mySet2                   
                                         mySet2.Add(                               "Geeks"                               );                   
                                         mySet2.Add(                               "and"                               );                   
                                         mySet2.Add(                               "GeeksforGeeks"                               );                   
                                         mySet2.Add(                               "are"                               );                   
                                         mySet2.Add(                               "the"                               );                   
                                         mySet2.Add(                               "best"                               );                   
                             
                                         // Creating a new HashSet that contains                   
                                         // the Intersection of both the HashSet mySet1 & mySet2                   
                                         HashSet<                               string                               > ans =                               new                               HashSet<                               string                               >(mySet1);                   
                             
                                         ans.IntersectWith(mySet2);                   
                             
                                         // Printing the Intersection of both the HashSet                   
                                         foreach                               (                               string                               i                               in                               ans)                   
                                         {                   
                                         Console.WriteLine(i);                   
                                         }                   
                                         }                   
                     }                   

输出：

Geeks
GeeksforGeeks

参考：

https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.hashset-1.intersectwith?view=netframework-4.7.2

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