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C# | Check if ListDictionary is read-only

Last Updated : 11 Jul, 2025

property is used to get a value indicating whether the ListDictionary is read-only or not.

public bool IsReadOnly { get; }

This property always returns

.

// 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);
    }
}

False

• A collection that is read-only does not allow the addition, removal, or modification of elements after the collection is created.
• A collection that is read-only is simply a collection with a wrapper that prevents modifying the collection. Therefore, if changes are made to the underlying collection, the read-only collection reflects those changes.
• Retrieving the value of this property is an O(1) operation.

• https://learn.microsoft.com/en-us/dotnet/api/system.collections.specialized.listdictionary.isreadonly?view=netframework-4.7.2

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