C# | Check if Hashtable is read-only

Last Updated : 01 Feb, 2019

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

Syntax:

public virtual bool IsReadOnly { get; }

Return Value: This property returns true if the Hashtable is read-only otherwise it returns false. The default is false.

Below programs illustrate the above-discussed property:

Example 1:

// C# code to check if Hashtable 
// is read-only or not 
using System; 
using System.Collections; 
  
class GFG { 
  
    // Driver code 
    public static void Main() 
    { 
  
        // Creating a Hashtable 
        Hashtable myTable = new Hashtable(); 
  
        // Adding elements in Hashtable 
        myTable.Add("G", "Geeks"); 
        myTable.Add("C", "C#"); 
        myTable.Add("D", "Data Structures"); 
        myTable.Add("Q", "Quiz"); 
  
        // Checking if Hashtable is read-only or not 
        // this will return false 
        Console.WriteLine(myTable.IsReadOnly); 
    } 
} 

Output:

False

Example 2:

// C# code to check if Hashtable 
// is read-only or not 
using System; 
using System.Collections; 
  
class GFG { 
  
    // Driver code 
    public static void Main() 
    { 
  
        // Creating a Hashtable 
        Hashtable myTable = new Hashtable(); 
  
        // Adding elements in Hashtable 
        myTable.Add("1", "C"); 
        myTable.Add("2", "C#"); 
        myTable.Add("3", "C++"); 
        myTable.Add("4", "HTML"); 
        myTable.Add("5", "CSS"); 
  
        // Checking if Hashtable is read-only or not 
        // this will return false 
        Console.WriteLine(myTable.IsReadOnly); 
    } 
} 

Output:

False

Note:

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.

Reference:

https://docs.microsoft.com/en-us/dotnet/api/system.collections.hashtable.isreadonly?view=netframework-4.7.2

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