C# |检查哈希集是否是指定集合的子集

原文:https://www . geesforgeks . org/c-sharp-check-if-a-hashset-is-subset-the-specific-collection/

一个 HashSet 是一个无序的独特元素的集合。在T5 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。 HashSet 。issubestof(IEnumerable)方法用于检查一个 HashSet 对象是否是指定集合的子集。

语法:

mySet1.IsSubsetOf(mySet2);

这里我自己 1 和我自己 2 是 HashSets。

返回类型:如果 HashSet 对象是另一个子集的子集，则该方法返回 true ，否则返回 false 。

异常:如果 HashSet 为 null ，该方法将给出 ArgumentNullException。

下面给出的是一些例子，以更好地理解实现:

例子 1:

// C# code to Check if a HashSet is
// a subset of the specified collection
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>();

        // Inserting elements in HashSet
        // mySet1 only contains even numbers less than
        // equal to 10
        for (int i = 1; i <= 5; i++)
            mySet1.Add(2 * i);

        // Creating a HashSet of integers
        HashSet<int> mySet2 = new HashSet<int>();

        // Inserting elements in HashSet
        // mySet2 contains all numbers from 1 to 10
        for (int i = 1; i <= 10; i++)
            mySet2.Add(i);

        // Check if a HashSet mySet1 is a subset
        // of the HashSet mySet2
        Console.WriteLine(mySet1.IsSubsetOf(mySet2));
    }
}

输出:

True

例 2:

// C# code to Check if a HashSet is
// a subset of the specified collection
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 elements in HashSet mySet2.
        // mySet2 contains all numbers from 1 to 10
        for (int i = 1; i <= 10; i++)
            mySet2.Add(i);

        // Check if a HashSet mySet1 is a subset
        // of the HashSet mySet2
        // It should return true, as an empty HashSet is
        // subset of other HashSet
        Console.WriteLine(mySet1.IsSubsetOf(mySet2));
    }
}

Output:

True

参考:

https://docs . Microsoft . com/en-us/dotnet/API/system . collections . generic . hashset-1 . issubestof？视图=netframework-4.7.2

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