C# | Check if Hashtable has a fixed size

Last Updated : 01 Feb, 2019

Hashtable.IsFixedSize Property is used to get a value which indicates whether the Hashtable has a fixed size or not.

Syntax:

public virtual bool IsFixedSize { get; }

Return Value: This property returns true if the Hashtable has a fixed size otherwise it returns false. The default is false.

Below programs illustrate the above-discussed property:

Example 1:

// C# code to check if Hashtable 
// has a fixed size 
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 has a fixed size 
        // this will return false 
        Console.WriteLine(myTable.IsFixedSize); 
    } 
} 

Output:

False

Example 2:

// C# code to check if Hashtable 
// has a fixed size 
using System; 
using System.Collections; 
  
class GFG { 
  
    // Driver code 
    public static void Main() 
    { 
  
        // Creating a Hashtable and  
        // giving it a size of 4 
        Hashtable myTable = new Hashtable(4); 
  
        // Adding elements in Hashtable 
        myTable.Add("1", "C"); 
        myTable.Add("2", "C#"); 
        myTable.Add("3", "DS"); 
        myTable.Add("4", "Java"); 
        myTable.Add("5","HTML"); 
        myTable.Add("6", "CSS"); 
  
        // Checking if Hashtable has a fixed size 
        // this will return false 
        Console.WriteLine(myTable.IsFixedSize); 
    } 
} 

Output:

False

Note:

A collection with a fixed size does not allow the addition or removal of elements after the collection is created, but it allows the modification of existing elements.
A collection with a fixed size is simply a collection with a wrapper that prevents adding and removing elements. Therefore, if changes are made to the underlying collection, including the addition or removal of elements, the fixed-size 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.isfixedsize?view=netframework-4.7.2

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