c#中.clear()作用

C＃List <T> .Clear()方法 (C# List<T>.Clear() Method)

List<T>.Clear() method is used to clear the list, it remove all elements from the list.

List <T> .Clear()方法用于清除列表，它从列表中删除所有元素。

Syntax:

句法：

    void List<T>.Clear();

Parameter: It accepts nothing.

参数：不接受任何内容。

Return value: It returns nothing – it's returns type is void

返回值：不返回任何内容–返回的类型为void

Example:

例：

    int list declaration:
List<int> a = new List<int>();
adding elements:
a.Add(10);
a.Add(20);
a.Add(30);
a.Add(40);
a.Add(50);
removing elements:
a.Clear();
Output:
None

使用List <T> .Clear()方法从列表中删除所有项目的C＃示例 (C# Example to remove all items from the list using List<T>.Clear() Method)

using System;
using System.Text;
using System.Collections.Generic;
namespace Test
{class Program
{static void printList(List<int> lst)
{//printing elements
foreach (int item in lst)
{Console.Write(item + " ");
}
Console.WriteLine();
}
static void Main(string[] args)
{//integer list
List<int> a = new List<int>();
//adding elements
a.Add(10);
a.Add(20);
a.Add(30);
a.Add(40);
a.Add(50);
if (a.Count > 0)
{//print the list
Console.WriteLine("list elements...");
printList(a);
}
else
{Console.WriteLine("list is empty");
}
//clear all elements
a.Clear();
//list after removing the elements
if (a.Count > 0)
{Console.WriteLine("list elements after removing elements...");
printList(a);
}
else
{Console.WriteLine("list is empty");
}
//hit ENTER to exit
Console.ReadLine();
}
}
}

Output

输出量

list elements...
10 20 30 40 50
list is empty

翻译自: https://www.includehelp.com/dot-net/list-t-clear-method-with-example-in-c-sharp.aspx

c#中.clear()作用