如何在 C# 中创建数组列表

原文:https://www . geeksforgeeks . org/如何创建 c-sharp 中的数组列表/

ArrayList()构造函数用于初始化 ArrayList 类的一个新实例，该实例将为空，并具有默认的初始容量。数组列表表示可以单独索引的对象的有序集合。它基本上是数组的替代。它还允许动态内存分配、添加、搜索和排序列表中的项目。

语法:

public ArrayList ();

要点:

  • The number of elements that an array can hold is called the capacity of the array list. If the element is to be added to the array list, the capacity will be automatically increased by reallocating the internal array.
  • If the size of the collection can be estimated, specifying the initial capacity will eliminate the need to perform a large number of resizing operations when adding elements to the array list.
  • This constructor is an O(1) operation.

例 1:

// C# Program to illustrate how
// to create a ArrayList
using System;
using System.Collections;

class Geeks {

    // Main Method
    public static void Main(String[] args)
    {

        // arrlist is the ArrayList object
        // ArrayList() is the constructor
        // used to initializes a new
        // instance of the ArrayList class
        ArrayList arrlist = new ArrayList();

        // Count property is used to get the
        // number of elements in ArrayList
        // It will give 0 as no elements
        // are present currently
        Console.WriteLine(arrlist.Count);
    }
}

输出:

0

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