C# | Creating a synchronized (thread-safe) wrapper for a SortedList object

SortedList.Synchronized(SortedList) Method is used to get the synchronized (thread-safe) wrapper for a SortedList object.

Syntax:

public static System.Collections.SortedList Synchronized (System.Collections.SortedList list);

Here, list is the name of the SortedList object which is to be synchronized.

Exception: This method will throw ArgumentNullException if the list is null.

Below programs illustrate the use of above-discussed method:

Example 1:

// C# code to create a synchronized
// (thread-safe) wrapper for a
// SortedList object
using System;
using System.Collections;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating an SortedList
        SortedList mySortedList = new SortedList();

        // Adding elements to SortedList
        mySortedList.Add("1", "one");
        mySortedList.Add("2", "two");
        mySortedList.Add("3", "three");
        mySortedList.Add("4", "four");
        mySortedList.Add("5", "five");

        // Creating a synchronized wrapper
        // around the SortedList.
        SortedList mySortedList_1 =
            SortedList.Synchronized(mySortedList);

        // --------- Using IsSynchronized Property

        // print the status of both SortedList
        Console.WriteLine("mySortedList SortedList is {0}.",
              mySortedList.IsSynchronized ? "synchronized" :
                                         "not synchronized");

        Console.WriteLine("mySortedList_1 SortedList is {0}.",
              mySortedList_1.IsSynchronized ? "synchronized" :
                                          "not synchronized");
    }
}

Output:

mySortedList SortedList is not synchronized.
mySortedList_1 SortedList is synchronized.

Example 2:

// C# code to create a synchronized
// (thread-safe) wrapper for a
// SortedList object
using System;
using System.Collections;

class GFG {

    // Driver code
    public static void Main()
    {

        // Creating an SortedList
        SortedList mySortedList = new SortedList();

        // Adding elements in SortedList
        mylist.Add("4", "Even");
        mylist.Add("9", "Odd");
        mylist.Add("5", "Odd and Prime");
        mylist.Add("2", "Even and Prime");

        // it will give runtime error as
        // table parameter can't be null
        SortedList my2 = SortedList.Synchronized(null);
    }
}

Runtime Error:

Unhandled Exception:
System.ArgumentNullException: Value cannot be null.
Parameter name: list

Note: For the thread safety of a SortedList object, all operations must be done through this wrapper only.

Reference:

• https://docs.microsoft.com/en-us/dotnet/api/system.collections.sortedlist.synchronized?view=netframework-4.7.2