C# |两个 HashSet 的并集
原文:https://www.geeksforgeeks.org/c-sharp-union-of-two-hashset/
一个 HashSet 是一个独特元素的无序集合。它属于体系。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。对于两个 HashSet 的联盟， HashSet 。使用 UnionWith(IEnumerable )方法 。
语法:
firstSet.UnionWith(secondSet)
异常:如果设置为空，则此方法给出参数空异常。
下面给出了一些例子，以便更好地理解实现:
例 1:
// C# code to find Union of two HashSet
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
for (int i = 0; i < 5; i++) {
mySet1.Add(i * 2);
}
// Inserting odd numbers less than
// equal to 10 in HashSet mySet2
for (int i = 0; i < 5; i++) {
mySet1.Add(i * 2 + 1);
}
// Creating a new HashSet that contains
// the union of both the HashSet mySet1 & mySet2
HashSet<int> ans = new HashSet<int>(mySet1);
ans.UnionWith(mySet2);
// Printing the union of both the HashSet
foreach(int i in ans)
{
Console.WriteLine(i);
}
}
}
Output:
0
2
4
6
8
1
3
5
7
9
例 2:
// C# code to find Union of two HashSet
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("GeeksforGeeks");
mySet1.Add("GeeksforGeeks");
// Inserting elements in mySet2
mySet2.Add("You");
mySet2.Add("are");
mySet2.Add("the");
mySet2.Add("best");
// Creating a new HashSet that contains
// the union of both the HashSet mySet1 & mySet2
HashSet<string> ans = new HashSet<string>(mySet1);
ans.UnionWith(mySet2);
// Printing the union of both the HashSet
foreach(string i in ans)
{
Console.WriteLine(i);
}
}
}
Output:
Hello
GeeksforGeeks
You
are
the
best
参考:
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