HashSet是唯一元素的无序集合。在System.Collections.Generic命名空间中找到它。它用于我们要防止将重复项插入到集合中的情况。就性能而言,与列表相比更好。哈希集
句法:
mySet1.IntersectWith(mySet2)
这里, mySet1和mySet2是两个HashSet。
异常:如果HashSet为null,则此方法将提供ArgumentNullException 。
下面给出了一些示例,以更好地理解实现:
范例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 mySet1 = new HashSet();
// Creating a HashSet of integers
HashSet mySet2 = new HashSet();
// 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 ans = new HashSet(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
范例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 mySet1 = new HashSet();
// Creating a HashSet of strings
HashSet mySet2 = new HashSet();
// 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 ans = new HashSet(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/zh-cn/dotnet/api/system.collections.generic.hashset-1.intersectwith?view=netframework-4.7.2