C# |两个 HashSets 的交集

原文:https://www . geesforgeks . org/c-sharp-两两相交-hashsets/

一个 HashSet 是一个独特元素的无序集合。见于 系统。集合.通用命名空间。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，与列表相比更好。 HashSet 。intersecwith(IEnumerable)方法 用于修改当前 HashSet 对象，使其只包含该对象和指定集合中存在的元素。

语法:

mySet1.IntersectWith(mySet2)

这里我自己 1 和我自己 2 是两个 HashSets。

异常:如果哈希表为空，该方法将给出参数异常。

下面给出了一些例子，以便更好地理解实现:

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);
        }
    }
}

Output:

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);
        }
    }
}

Output:

Geeks
GeeksforGeeks

参考:

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