Queues
Let's say that we are at a pharmacy and each customer gets a ticket of order.
Order class
We begin by creating an Order class:
internal class Order
{
public DateTime Time { get; set; }
public int Number { get; set; }
}
Then, we can create an orders queue:
var orders = new Queue<Order>();
We can create an extension method to add orders:
internal static class OrdersExtension
{
private static int _orderNumber;
public static void AddOrder(this Queue<Order> orders)
{
orders.Enqueue(new Order { Time = DateTime.Now, Number = _orderNumber++ });
}
}
Let's try to add 10 orders:
for (int i = 0; i <= 10; i++)
{
orders.AddOrder();
Thread.Sleep(100);
}
Let's print the orders:
foreach (var order in orders)
{
Console.WriteLine(order);
}
Also, we need to override the ToString method to print something more meaningful 😄
public override string ToString()
{
return $"{CustomerName} at {Time.ToLongTimeString()} ";
}
And this is the result:
100 at 11:51:21 AM
101 at 11:51:21 AM
102 at 11:51:21 AM
103 at 11:51:22 AM
104 at 11:51:22 AM
105 at 11:51:22 AM
106 at 11:51:22 AM
107 at 11:51:22 AM
108 at 11:51:22 AM
109 at 11:51:22 AM
110 at 11:51:22 AM
When a customer gets the products, we can call this:
orders.Dequeue();
And we are sure that it removes the first entry.