using System;

using System.Collections.Generic;

​

public class PortfolioDTO

{

    public int PortfolioId { get; set; }

    public string Name { get; set; }

    public string Description { get; set; }

    public DateTime CreatedDate { get; set; }

    public DateTime ModifiedDate { get; set; }

}

​

public class PortfolioQueue

{

    private Queue<PortfolioDTO> portfolioQueue = new Queue<PortfolioDTO>();

​

    // Enqueue (Add a new portfolio to the queue)

    public void EnqueuePortfolio(PortfolioDTO portfolio)

    {

        portfolioQueue.Enqueue(portfolio);

    }

​

    // Dequeue (Remove and return the portfolio at the front of the queue)

    public PortfolioDTO DequeuePortfolio()

    {

        if (portfolioQueue.Count > 0)

        {

            return portfolioQueue.Dequeue();

        }

        else

        {

            throw new InvalidOperationException("Queue is empty");

        }

    }

​

    // Access (Retrieve all portfolios in the queue)

    public List<PortfolioDTO> GetAllPortfolios()

    {

        return new List<PortfolioDTO>(portfolioQueue);

    }

​

    // Search (Retrieve a portfolio by ID)

    public PortfolioDTO GetPortfolioById(int id)

    {

        foreach (var portfolio in portfolioQueue)

        {

            if (portfolio.PortfolioId == id)

            {

                return portfolio;

            }

        }

        return null;

    }

​

    // Get the count of portfolios in the queue

    public int GetPortfolioCount()

    {

        return portfolioQueue.Count;

    }

}

​

// Example usage

public class Program

{

    public static void Main()

    {

        PortfolioQueue portfolioQueue = new PortfolioQueue();

​

        portfolioQueue.EnqueuePortfolio(new PortfolioDTO { PortfolioId = 1, Name = "Portfolio 1", Description = "Description 1", CreatedDate = DateTime.Now, ModifiedDate = DateTime.Now });

        portfolioQueue.EnqueuePortfolio(new PortfolioDTO { PortfolioId = 2, Name = "Portfolio 2", Description = "Description 2", CreatedDate = DateTime.Now, ModifiedDate = DateTime.Now });

        Console.WriteLine();

        Console.WriteLine("All Portfolios in Queue:");

        foreach (var portfolio in portfolioQueue.GetAllPortfolios())

        {

            Console.WriteLine($"ID: {portfolio.PortfolioId}, Name: {portfolio.Name}, Description: {portfolio.Description}");

        }

        var searchResult = portfolioQueue.GetPortfolioById(1);

        Console.WriteLine();

        Console.WriteLine($"\nSearch Result: ID: {searchResult.PortfolioId}, Name: {searchResult.Name}, Description: {searchResult.Description}");

​

        var dequeuedPortfolio = portfolioQueue.DequeuePortfolio();

        Console.WriteLine();

        Console.WriteLine($"\nDequeued Portfolio: ID: {dequeuedPortfolio.PortfolioId}, Name: {dequeuedPortfolio.Name}, Description: {dequeuedPortfolio.Description}");

​

        Console.WriteLine("\nPortfolios left in Queue:");

        foreach (var portfolio in portfolioQueue.GetAllPortfolios())

        {

            Console.WriteLine($"ID: {portfolio.PortfolioId}, Name: {portfolio.Name}, Description: {portfolio.Description}");

        }

​

        Console.WriteLine($"\nTotal Portfolios in Queue: {portfolioQueue.GetPortfolioCount()}");

    }

}