C# |从集合中移除所有元素
收藏。清除方法用于清除集合< T** >中的所有元素。
语法:
public void Clear ();
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 the Collection
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
class GFG {
// Driver code
public static void Main()
{
// Creating a collection of strings
Collection<string> myColl = new Collection<string>();
// Adding elements in Collection myColl
myColl.Add("A");
myColl.Add("B");
myColl.Add("C");
myColl.Add("D");
myColl.Add("E");
// To print the count of elements in Collection
Console.WriteLine("Count : " + myColl.Count);
// Displaying the elements in myColl
foreach(string str in myColl)
{
Console.WriteLine(str);
}
// Removing all the elements from Collection
myColl.Clear();
// To print the count of elements in Collection
Console.WriteLine("Count : " + myColl.Count);
// Displaying the elements in myColl
foreach(string str in myColl)
{
Console.WriteLine(str);
}
}
}
输出:
Count : 5
A
B
C
D
E
Count : 0
例 2:
// C# code to remove all
// elements from the Collection
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
class GFG {
// Driver code
public static void Main()
{
// Creating a collection of ints
Collection<int> myColl = new Collection<int>();
// Adding elements in Collection myColl
myColl.Add(2);
myColl.Add(3);
myColl.Add(4);
myColl.Add(5);
// To print the count of elements in Collection
Console.WriteLine("Count : " + myColl.Count);
// Displaying the elements in myColl
foreach(int i in myColl)
{
Console.WriteLine(i);
}
// Removing all the elements from Collection
myColl.Clear();
// To print the count of elements in Collection
Console.WriteLine("Count : " + myColl.Count);
// Displaying the elements in myColl
foreach(int i in myColl)
{
Console.WriteLine(i);
}
}
}
输出:
Count : 4
2
3
4
5
Count : 0
注:
- Count 被设置为零,并且集合元素对其他对象的引用也被释放。
- 这个方法是一个 O(n)运算,其中 n 是 Count。
参考:
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