C# |检查列表字典是否为只读
原文:https://www . geesforgeks . org/c-sharp-check-if-list dictionary-只读/
列表词典。IsReadOnly 属性用于获取一个值,该值指示列表字典是否是只读的。
语法:
public bool IsReadOnly { get; }
返回值:该属性始终返回 false 。
例:
// C# code to check if ListDictionary is read-only
using System;
using System.Collections;
using System.Collections.Specialized;
class GFG {
// Driver code
public static void Main()
{
// Creating a ListDictionary named myDict
ListDictionary myDict = new ListDictionary();
myDict.Add("Australia", "Canberra");
myDict.Add("Belgium", "Brussels");
myDict.Add("Netherlands", "Amsterdam");
myDict.Add("China", "Beijing");
myDict.Add("Russia", "Moscow");
myDict.Add("India", "New Delhi");
// Checking if ListDictionary is read-only
Console.WriteLine(myDict.IsReadOnly);
}
}
输出:
False
注意:
- The read-only collection is not allowed to add, remove or modify elements after it is created.
- A read-only collection is just a collection with a wrapper that prevents the collection from being modified. Therefore, if changes are made to the underlying collection, the read-only collection will reflect these changes.
- Retrieving the value of this attribute is an O(1) operation.
参考:
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