C# |从哈希集中移除所有元素
原文:https://www . geeksforgeeks . org/c-sharp-remove-all-elements-from-a-hashset/
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。 HashSet 。清除方法 用于从 HashSet 对象中移除所有元素。
语法:
mySet.Clear();
这里， mySet 是 HashSet 的名字。
下面给出了一些例子，以便更好地理解实现:
例 1:
// C# code to remove all elements from 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 even numbers less than
// equal to 20 in HashSet mySet1
for (int i = 0; i < 10; i++) {
mySet.Add(i * 2);
}
// Displaying the number of elements in HashSet
Console.WriteLine(mySet.Count);
// Removing all the elements from HashSet
mySet.Clear();
// Displaying the number of elements in HashSet
// after removing all the elements from it
Console.WriteLine(mySet.Count);
}
}
Output:
10
0
例 2:
// C# code to remove all elements from HashSet
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 in HashSet
mySet.Add("Geeks");
mySet.Add("and");
mySet.Add("GeeksforGeeks");
mySet.Add("are");
mySet.Add("the");
mySet.Add("best");
// Displaying the number of elements in HashSet
Console.WriteLine(mySet.Count);
// Removing all the elements from HashSet
mySet.Clear();
// Displaying the number of elements in HashSet
// after removing all the elements from it
Console.WriteLine(mySet.Count);
// Inserting elements in HashSet
mySet.Add("Join");
mySet.Add("Geeks");
mySet.Add("Classes");
// Displaying the number of elements in HashSet
Console.WriteLine(mySet.Count);
}
}
Output:
6
0
3
参考:
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