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。
哈希集
句法:
mySet1.IsProperSupersetOf(mySet2);
在这里, mySet1和mySet2是2个HashSet。
返回值:如果mySet1是mySet2的正确超集,则该函数返回true ,否则返回false 。
异常:如果HashSet为空,则此方法将提供ArgumentNullException 。
下面给出了一些示例,以更好地理解实现:
范例1:
// C# code to Check if a HashSet is a proper
// superset of the specified collection
using System;
using System.Collections.Generic;
class GFG {
// Driver code
public static void Main()
{
// Creating a HashSet of integers
HashSet mySet1 = new HashSet();
// Inserting elements into HashSet mySet1
for (int i = 10; i < 20; i++) {
mySet1.Add(i);
}
// Creating a HashSet of integers
HashSet mySet2 = new HashSet();
// Inserting elements into HashSet mySet2
for (int i = 0; i < 25; i++) {
mySet2.Add(i);
}
// Checking if mySet1 is Proper Superset Of mySet2
// The function returns true if the condition
// satisfies, else returns false
Console.WriteLine(mySet1.IsProperSupersetOf(mySet2));
}
}
输出:
False
范例2:
// C# code to Check if a HashSet is a proper
// superset of the specified collection
using System;
using System.Collections.Generic;
class GFG {
// Driver code
public static void Main()
{
// Creating a HashSet of strings
HashSet mySet1 = new HashSet();
// Inserting elements into HashSet mySet1
mySet1.Add("India");
mySet1.Add("Japan");
mySet1.Add("USA");
mySet1.Add("Spain");
mySet1.Add("Italy");
// Creating a HashSet of strings
HashSet mySet2 = new HashSet();
// Inserting elements into HashSet mySet2
mySet2.Add("USA");
mySet2.Add("Spain");
mySet2.Add("Italy");
// Checking if mySet1 is Proper Superset Of mySet2
// The function returns true if the condition
// satisfies, else returns false
Console.WriteLine(mySet1.IsProperSupersetOf(mySet2));
}
}
输出:
True
参考:
- https://docs.microsoft.com/zh-cn/dotnet/api/system.collections.generic.hashset-1.ispropersupersetof?view=netframework-4.7.2