c# | HashSet 中的元素个数

原文:https://www . geesforgeks . org/c-sharp-元素数量-in-hashset/

一个 HashSet 是一个无序的独特元素的集合。在系统中找到。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。可以使用 HashSet 。计数属性 计算哈希表中的元素数量。

语法:

mySet.Count;

这里我自己是 HashSet

下面给出了一些例子，以便更好地理解实现:

例 1:

// C# code to get the number of
// elements that are contained in HashSet
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 elements in HashSet
        for (int i = 0; i < 5; i++) {
            mySet.Add(i * 2);
        }

        // To get the number of
        // elements that are contained in HashSet
        Console.WriteLine(mySet.Count);
    }
}

Output:

5

例 2:

// C# code to get the number of
// elements that are contained in HashSet
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>();

        // To get the number of
        // elements that are contained in HashSet.
        // Note that, here the HashSet is empty
        Console.WriteLine(mySet.Count);
    }
}

Output:

0

参考:

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