■ object 클래스의 GetHashCode/Equals 메소드를 사용해 열거 가능형에서 중복 항목을 제거하는 방법을 보여준다.
▶ Item.cs
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namespace TestProject; /// <summary> /// 항목 /// </summary> public class Item { //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region ID - ID /// <summary> /// ID /// </summary> public int ID { get; set; } #endregion #region 명칭 - Name /// <summary> /// 명칭 /// </summary> public string Name { get; set; } #endregion #region 코드 - Code /// <summary> /// 코드 /// </summary> public string Code { get; set; } #endregion #region 가격 - Price /// <summary> /// 가격 /// </summary> public int Price { get; set; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Public #region 해시 코드 구하기 - GetHashCode() /// <summary> /// 해시 코드 구하기 /// </summary> /// <returns>해시 코드</returns> public override int GetHashCode() { return $"{ID}|{Name}|{Code}|{Price}".GetHashCode(); } #endregion #region 동일 여부 구하기 - Equals(source) /// <summary> /// 동일 여부 구하기 /// </summary> /// <param name="source">소스 객체</param> /// <returns>동일 여부</returns> public override bool Equals(object source) { if(!(source is Item)) { return false; } Item sourceItem = (Item)source; return sourceItem.ID == ID && sourceItem.Name == Name && sourceItem.Code == Code && sourceItem.Price == Price; } #endregion #region 문자열 구하기 - ToString() /// <summary> /// 문자열 구하기 /// </summary> /// <returns>문자열</returns> public override string ToString() { return $"ID={ID};Name={Name};Code={Code};Price={Price}"; } #endregion } |
▶ Program.cs
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namespace TestProject; /// <summary> /// 프로그램 /// </summary> class Program { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region 프로그램 시작하기 - Main() /// <summary> /// 프로그램 시작하기 /// </summary> private static void Main() { List<Item> sourceList = new List<Item>(); sourceList.Add(new Item { ID = 1, Name = "항목1", Code = "CODE1", Price = 100}); sourceList.Add(new Item { ID = 1, Name = "항목1", Code = "CODE1", Price = 100}); sourceList.Add(new Item { ID = 2, Name = "항목2", Code = "CODE2", Price = 200}); sourceList.Add(new Item { ID = 2, Name = "항목2", Code = "CODE2", Price = 200}); sourceList.Add(new Item { ID = 3, Name = "항목3", Code = "CODE3", Price = 300}); IEnumerable<Item> resultEnumerable = sourceList.Distinct(); foreach(Item item in resultEnumerable) { Console.WriteLine(item); } } #endregion } |
