C# | Creating a synchronized (thread-safe) wrapper for the Hashtable
Last Updated :
09 Aug, 2021
Hashtable.Synchronized(Hashtable) Method is used to return a synchronized (thread-safe) wrapper for the Hashtable.
Syntax:
public static System.Collections.Hashtable Synchronized (System.Collections.Hashtable table);
Here table is the Hashtable which is to be synchronized.
Return Value: This method returns a synchronized (thread-safe) wrapper for the Hashtable.
Exception: This method will throw the ArgumentNullException if the table is null.
Below programs illustrate the use of above-discussed method:
Example 1:
CSharp
using System;
using System.Collections;
class GFG {
static void Main(string[] args)
{
Hashtable has1 = new Hashtable();
has1.Add("1", "Welcome");
has1.Add("2", "to");
has1.Add("3", "geeks");
has1.Add("4", "for");
has1.Add("5", "geeks");
Hashtable has2 = Hashtable.Synchronized(has1);
Console.WriteLine("has1 Hashtable is {0}.",
has1.IsSynchronized ? "synchronized" :
"not synchronized");
Console.WriteLine("has2 Hashtable is {0}.",
has2.IsSynchronized ? "synchronized" :
"not synchronized");
}
}
|
Output:
has1 Hashtable is not synchronized.
has2 Hashtable is synchronized.
Example 2:
CSharp
using System;
using System.Collections;
class GFG {
static void Main(string[] args)
{
Hashtable has1 = new Hashtable();
Hashtable has2 = Hashtable.Synchronized(null);
}
}
|
Runtime Error:
Unhandled Exception:
System.ArgumentNullException: Value cannot be null.
Parameter name: table
Note:
- This method is a thread-safe for multiple readers and writers. Furthermore, the synchronized wrapper ensures that there is only one writer writing at a time.
- Enumerating through a collection is intrinsically not a thread-safe process. Other threads can still modify the collection, which causes the enumerator to throw an exception even when a collection is synchronized.
- To guarantee thread safety during enumeration, you can either lock the collection during the entire enumeration or catch the exceptions resulting from changes made by other threads.
- This method is an O(1) operation.
Reference:
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