C# |从另一个集合创建 HashSet】
原文:https://www . geesforgeks . org/c-sharp-create-hashset-from-other-collection/
一个 HashSet 是一个独特元素的无序集合。它属于T3 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。您可以从另一个集合创建一个 HashSet，方法是在创建 HashSet 的对象时将该集合作为参数传递。
下面给出了一些例子，以便更好地理解实现:
例 1:
// C# code to Create HashSet
// from another collection
using System;
using System.Collections.Generic;
class GFG {
// Driver code
public static void Main()
{
// Creating a HashSet of integers
HashSet<int> mySet = new HashSet<int>();
// Inserting even numbers less than
// equal to 10 in HashSet mySet
for (int i = 0; i < 5; i++) {
mySet.Add(i * 2);
}
// Creating new HashSet mySet_new from already
// Created HashSet mySet
HashSet<int> mySet_new = new HashSet<int>(mySet);
Console.WriteLine("The elements in newly created HashSet are : ");
// Displaying the elements of newly created HashSet
foreach(int i in mySet_new)
{
Console.WriteLine(i);
}
}
}
Output:
The elements in newly created HashSet are :
0
2
4
6
8
例 2:
// C# code to Create HashSet
// from another collection
using System;
using System.Collections.Generic;
class GFG {
// Driver code
public static void Main()
{
// Creating a HashSet of strings
HashSet<string> mySet = new HashSet<string>();
// Inserting elements into HashSet mySet
mySet.Add("Delhi");
mySet.Add("Noida");
mySet.Add("Chandigarh");
mySet.Add("New York");
mySet.Add("Bangalore");
// Creating new HashSet mySet_new from already
// Created HashSet mySet
HashSet<string> mySet_new = new HashSet<string>(mySet);
Console.WriteLine("The elements in newly created HashSet are : ");
// Displaying the elements of newly created HashSet
foreach(string i in mySet_new)
{
Console.WriteLine(i);
}
}
}
Output:
The elements in newly created HashSet are :
Delhi
Noida
Chandigarh
New York
Bangalore
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