■ 객체 컬렉션에서 특정 객체 속성 값의 집합을 구하는 방법을 보여준다. (속성 2개 이상 지정 가능)
▶ 예제 코드 (C#)
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using System; using System.Collections.Generic; using System.Collections.ObjectModel; using System.ComponentModel; using System.Linq; #region 객체 컬렉션 특정 객체 속성 값의 집합 구하기 - GetDistinctCollection(sourceCollection, propertyNameArray) /// <summary> /// 객체 컬렉션 특정 객체 속성 값의 집합 구하기 /// </summary> /// <param name="sourceCollection">소스 컬렉션</param> /// <param name="propertyNameArray">속성명 배열</param> /// <returns>객체 컬렉션 특정 객체 속성 값의 집합</returns> public ObservableCollection<object> GetDistinctCollection(ObservableCollection<object> sourceCollection, string[] propertyNameArray) { if(sourceCollection == null || sourceCollection.Count == 0) { return null; } var result = sourceCollection.AsEnumerable().GroupBy(item => new DistinctTuple<object>(from propertyName in propertyNameArray select item.GetType().GetProperty(propertyName).GetValue(item))); int propertyNameCount = propertyNameArray.Length; PropertyDescriptorCollection pdc = TypeDescriptor.GetProperties(sourceCollection[0]); DynamicClass dynamicClass = new DynamicClass(); // '동적 클래스 사용하기' 참조 for(int i = 0; i < propertyNameCount; i++) { dynamicClass.AddProperty(propertyNameArray[i], pdc[propertyNameArray[i]].PropertyType); } dynamicClass.CreateType(); ObservableCollection<object> targetCollection = new ObservableCollection<object>(); foreach(var group in result) { dynamicClass.CreateInstance(); for(int i = 0; i < propertyNameCount; i++) { dynamicClass.SetValue(i, group.Key.ValueArray[i]); } targetCollection.Add(dynamicClass.Instance); } return targetCollection; } #endregion /// <summary> /// 중복 제거 튜플 /// </summary> /// <typeparam name="T">타입</typeparam> public class DistinctTuple<T> : IEquatable<DistinctTuple<T>> { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Public #region Field /// <summary> /// 값 배열 /// </summary> public readonly T[] ValueArray; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - DistinctTuple(enumerable) /// <summary> /// 생성자 /// </summary> /// <param name="enumerable">열거 가능형</param> public DistinctTuple(IEnumerable<T> enumerable) { ValueArray = enumerable.ToArray(); } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Public #region 동등 여부 조사하기 - Equals(sourceTuple) /// <summary> /// 동등 여부 조사하기 /// </summary> /// <param name="sourceTuple">소스 Tuple</param> /// <returns>동등 여부</returns> public bool Equals(DistinctTuple<T> sourceTuple) { if(ReferenceEquals(this, sourceTuple)) { return true; } if(sourceTuple == null) { return false; } int length = ValueArray.Length; if(length != sourceTuple.ValueArray.Length) { return false; } for(int i = 0; i < length; i++) { if(!Equals(ValueArray[i], sourceTuple.ValueArray[i])) { return false; } } return true; } #endregion #region 동등 여부 조사하기 - Equals(sourceObject) /// <summary> /// 동등 여부 조사하기 /// </summary> /// <param name="sourceObject">소스 객체</param> /// <returns>동등 여부</returns> public override bool Equals(object sourceObject) { if(ReferenceEquals(this, sourceObject)) { return false; } if(sourceObject == null) { return false; } return Equals(sourceObject as DistinctTuple<T>); } #endregion #region 해시 코드 구하기 - GetHashCode() /// <summary> /// 해시 코드 구하기 /// </summary> /// <returns>해시 코드</returns> public override int GetHashCode() { int hashCode = 17; foreach(var value in ValueArray) { hashCode = hashCode * 37 + (!ReferenceEquals(value, null) ? value.GetHashCode() : 0); } return hashCode; } #endregion } |