Iterator_Exercise.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace DesignPatternExamples_csharp
{
    internal class Iterator_Exercise
    {
        // ! [Using Iterator in C#]
        public void Run()
        {
            Console.WriteLine();
            Console.WriteLine("Iterator Exercise");
 
            // For this example, the class already has built into it the data
            // to be iterated over.
            IteratorContainer_Class items = new IteratorContainer_Class();
 
            Console.WriteLine("  Iterating over keys only:");
            var keyIterator = items.GetKeys();
            for (string? item = keyIterator.Next(); item != null; item = keyIterator.Next())
            {
                Console.WriteLine("    {0}", item);
            }
 
            Console.WriteLine("  Iterating over values only:");
            var valueIterator = items.GetValues();
            for (string? item = valueIterator.Next(); item != null; item = valueIterator.Next())
            {
                Console.WriteLine("    {0}", item);
            }
 
            Console.WriteLine("  Iterating over all items:");
            var itemIterator = items.GetItems();
            for (ItemPair? item = itemIterator.Next(); item != null; item = itemIterator.Next())
            {
                Console.WriteLine("    {0} = {1}", item.Key, item.Value);
            }
 
            Console.WriteLine("  Done.");
        }
        // ! [Using Iterator in C#]
    }
}