C＃|从另一个集合创建HashSet

HashSet是唯一元素的无序集合。它位于System.Collections.Generic命名空间下。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。您可以通过在创建HashSet对象的同时将集合作为参数传递来从另一个集合创建HashSet。

下面给出了一些示例，以更好地理解实现：

范例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 mySet = new HashSet();
  
        // 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 mySet_new = new HashSet(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);
        }
    }
}

输出：

The elements in newly created HashSet are : 
0
2
4
6
8

范例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 mySet = new HashSet();
  
        // 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 mySet_new = new HashSet(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);
        }
    }
}

输出：

The elements in newly created HashSet are : 
Delhi
Noida
Chandigarh
New York
Bangalore