C# |检查数组列表是否为只读
原文:https://www . geesforgeks . org/c-sharp-check-if-the-ArrayList-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:
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