C# | Check if Hashtable is synchronized (thread safe)

Last Updated : 01 Feb, 2019

Hashtable.IsSynchronized Property is used to get a value indicating whether access to the Hashtable is synchronized(thread-safe).

Syntax:

public virtual bool IsSynchronized { get; }

Return Value: This property return true if access to the Hashtable is synchronized (thread-safe), otherwise it returns false. The default is false.

Below programs illustrate the use of above-discussed property:

Example 1:

// C# code to check if Hashtable 
// Is Synchronized or not 
using System; 
using System.Collections; 
  
class GFG { 
  
    // Driver code 
    public static void Main() 
    { 
  
        // create and initialize Hashtable  
        // using Add() method  
        Hashtable has1 = new Hashtable();  
          
        has1.Add("1", "Welcome");  
        has1.Add("2", "to");  
        has1.Add("3", "geeks");  
        has1.Add("4", "for");  
        has1.Add("5", "geeks");  
  
        // Creates a synchronized 
        // wrapper around the Hashtable. 
        Hashtable smyTable = Hashtable.Synchronized(has1); 
  
        // Displays the synchronization  
        // status of both Hashtables. 
        Console.WriteLine("has1 is {0}.", has1.IsSynchronized ?  
                                "Synchronized" : "Not Synchronized"); 
                                  
        Console.WriteLine("smyTable is {0}.", smyTable.IsSynchronized ? 
                                  "Synchronized" : "Not Synchronized"); 
    } 
} 

Output:

has1 is Not Synchronized.
smyTable is Synchronized.

Example 2:

// C# code to check if Hashtable 
// Is Synchronized 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 
        // synchronized (thread safe) 
        Console.WriteLine(myTable.IsSynchronized); 
    } 
} 

Output:

False

Note: A Hashtable can support one writer and multiple readers concurrently. To support multiple writers, all operations must be done through the wrapper returned by the Synchronized method.

Reference:

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

C# | Check if ArrayList is Synchronized (thread safe)

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