C# |检查数组列表是否为只读

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。数组列表。IsReadOnly 属性用于检查数组列表是否为只读。

属性:

• Elements can be added or removed from the array list collection at any point in time.
• Arrays do not guarantee sorting.
• The capacity of the array is the number of elements that the array list can hold.
• You can access the elements in this collection using an integer index. The index in this collection is zero-based.
• Duplicate elements are also allowed.
• Multidimensional arrays are not supported as elements in array list collections.

语法:

public virtual bool IsReadOnly { get; }

返回值:如果数组列表是只读的，这个方法返回 真 ，否则返回 假 。默认值为 假 。

示例:

// C# code to check if the ArrayList
// is read-only or not
using System;
using System.Collections;
using System.Collections.Generic;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating an ArrayList
        ArrayList myList = new ArrayList();

        // Adding elements to ArrayList
        myList.Add("Geeks");
        myList.Add("for");
        myList.Add("Geeks");
        myList.Add("Noida");
        myList.Add("Geeks Classes");
        myList.Add("Delhi");

        // To check if the ArrayList is read-only or not
        Console.WriteLine(myList.IsReadOnly);
    }
}

Output:

False

注意:

• The read-only collection is not allowed to add, remove or modify elements after it is created.
• Retrieving the value of this attribute is an O(1) operation.

参考:

• https://docs。微软。com/en-us/dotnet/API/system。收藏品。数组列表。是只读的。视图=netframework-4.7.2

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