IEnumerator, IEnumerable 상속받은 Inventory 구현 (인덱서)

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출력하기

꺼내기 

foreach가능 하게 만들기 

인덱서 구현 하기 

null값 제거하고 순서 정렬하기 

배열길이 자동증가 

 

using System;
 
namespace ConsoleApp9
{
    class Program
    {
        static void Main(string[] args)
        {
            var app = new App();
            app.Start();
        }
    }
}
 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace ConsoleApp9
{
    class App
    {
        public void Start()
        {
            var inventory = new Inventory();
            inventory[0] = new Item("도끼");
            inventory.AddItem(new Item("장검"));
            inventory.AddItem(new Item("단검"));
            inventory[6] = new Item("가죽옷");
 
            inventory.DisplayItems();
 
            var searchName = "단검";
            var foundItem = inventory.GetItem(searchName);
            if (foundItem != null)
            {
                Console.WriteLine("{0}을 찾았습니다.", foundItem.itemName);
            }
            else
            {
                Console.WriteLine("{0}은 찾을수 없습니다.", searchName);
            }
            inventory.Arrange();
 
            inventory.DisplayItems();
 
            inventory.AddItem(new Item("단검"));
 
            Console.WriteLine();
            Console.WriteLine();
            inventory.DisplayItems();
 
            inventory[9] = new Item("판금갑옷");
            Console.WriteLine();
            Console.WriteLine();
            inventory.Arrange();
            inventory.DisplayItems();
 
 
            inventory.AddItem(new Item("초급용 지팡이"));
            Console.WriteLine();
            Console.WriteLine();
            inventory.DisplayItems();
 
            Console.WriteLine();
            Console.WriteLine();
            foreach (Item item in inventory)
            {
                if (item != null)
                {
                    Console.WriteLine(item.itemName);
                }
               
            }
 
            Console.ReadKey();
        }
    }
}
 

 

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace ConsoleApp9
{
    public class Inventory : IEnumerator, IEnumerable
    {
        //indexer: https://docs.microsoft.com/ko-kr/dotnet/csharp/programming-guide/indexers/
        //https://support.microsoft.com/ko-kr/help/322022/how-to-make-a-visual-c-class-usable-in-a-foreach-statement
        //https://docs.microsoft.com/ko-kr/dotnet/csharp/language-reference/keywords/yield
 
        private Item[] items = new Item[5];
        private int nextIndex = 0;
        private int position = -1;
 
        public Item this[int index]
        {
            get
            {
                nextIndex = index;
                    
                return this.items[nextIndex];
            }
            set
            {
                nextIndex = index;
                if (this.nextIndex > this.items.Length)
                {
                    Array.Resize<Item>(ref this.items, this.items.Length * 2);
                }
                this.items[nextIndex++] = value;
            }
        }
 
        public int Length
        {
            get
            {
                return this.items.Length;
            }
        }
 
        public Item GetItem(string searchName)
        {
            Item foundItem = null;
            for (int i = 0; i < this.items.Length; i++)
            {
                var item = this.items[i];
                if (item != null)
                {
                    if (item.itemName == searchName)
                    {
                        foundItem = item;
                        this.items[i] = null;
                        break;
                    }
                }
            }
            return foundItem;
        }
 
        public void AddItem(Item item)
        {
            if (this.nextIndex > this.items.Length)
            {
                Array.Resize<Item>(ref this.items, this.items.Length * 2);
            }
 
            this.items[this.nextIndex++] = item;
        }
 
 
        #region 인터페이스 구현 시작 
        public IEnumerator GetEnumerator()
        {
            return (IEnumerator)this;
        }
 
        public bool MoveNext()
        {
            this.position++;
            return (this.position < this.items.Length);
        }
 
        public void Reset()
        {
            this.position = 0;
        }
 
        public object Current
        {
            get
            {
                return this.items[this.position];
            }
        }
        #endregion 인터페이스 구현 끝 
 
        public void DisplayItems()
        {
            foreach (Item item in this.items)
            {
                if (item == null)
                {
                    Console.WriteLine("---> {0}", item);
                }
                else
                {
                    Console.WriteLine("---> {0}, {1}", item, item.itemName);
                }
            }
        }
 
        public void Arrange()
        {
            Item[] arrTemp = new Item[this.items.Length];
            int tempIdx = 0;
 
            for (int i = 0; i < this.items.Length; i++)
            {
                if (this.items[i] != null)
                {
                    arrTemp[tempIdx++] = this.items[i];
                }
            }
            this.nextIndex = tempIdx;
            this.items = arrTemp;
        }
    }
}
 

 

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace ConsoleApp9
{
    public class Item
    {
        public string itemName;
 
        public Item(string itemName)
        {
            this.itemName = itemName;
        }
    }
}