■ IEnumerable 인터페이스를 사용하는 방법을 보여준다.
▶ 예제 코드 (C#)
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Employee[] employeeArray = new Employee[3] { new Employee("John", "Smith" ), new Employee("Jim" , "Johnson"), new Employee("Sue" , "Rabon" ) }; EmployeeEnumerable employeeEnumerable = new EmployeeEnumerable(employeeArray); foreach(Employee employee in employeeEnumerable) { Console.WriteLine(employee.FirstName + " " + employee.LastName); } |
▶ Employee.cs
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/// <summary> /// 직원 /// </summary> public class Employee { //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region 이름 - FirstName /// <summary> /// 이름 /// </summary> public string FirstName { get; set; } #endregion #region 성 - LastName /// <summary> /// 성 /// </summary> public string LastName { get; set; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - Employee(firstName, lastName) /// <summary> /// 생성자 /// </summary> /// <param name="firstName">이름</param> /// <param name="lastName">성</param> public Employee(string firstName, string lastName) { FirstName = firstName; LastName = lastName; } #endregion } |
▶ EmployeeEnumerator.cs
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using System; using System.Collections; /// <summary> /// 직원 열거자 /// </summary> public class EmployeeEnumerator : IEnumerator { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 직원 배열 /// </summary> private Employee[] employeeArray; /// <summary> /// 현재 위치 /// </summary> private int currentPosition = -1; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region 직원 배열 - EmployeeArray /// <summary> /// 직원 배열 /// </summary> public Employee[] EmployeeArray { get { return this.employeeArray; } set { this.employeeArray = value; } } #endregion #region 현재 항목 - IEnumerator.Current /// <summary> /// 현재 항목 /// </summary> object IEnumerator.Current { get { return Current; } } #endregion #region 현재 항목 - Current /// <summary> /// 현재 항목 /// </summary> public Employee Current { get { try { return this.employeeArray[this.currentPosition]; } catch(IndexOutOfRangeException) { throw new InvalidOperationException(); } } } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - EmployeeEnumerator(employeeArray) /// <summary> /// 생성자 /// </summary> /// <param name="employeeArray">직원 배열</param> public EmployeeEnumerator(Employee[] employeeArray) { this.employeeArray = employeeArray; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Public #region 다음 요소로 이동하기 - MoveNext() /// <summary> /// 다음 요소로 이동하기 /// </summary> /// <returns>현재 위치가 마지막 요소 뒤 위치 여부</returns> public bool MoveNext() { this.currentPosition++; return (this.currentPosition < this.employeeArray.Length); } #endregion #region 위치 처음 요소 앞으로 이동하기 - Reset() /// <summary> /// 위치 처음 요소 앞으로 이동하기 /// </summary> public void Reset() { this.currentPosition = -1; } #endregion } |
▶ EmployeeEnumerable.cs
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using System; using System.Collections; /// <summary> /// 직원 열거가능 /// </summary> public class EmployeeEnumerable : IEnumerable { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 직원 배열 /// </summary> private Employee[] employeeArray; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - EmployeeEnumerable(employeeArray) /// <summary> /// 생성자 /// </summary> /// <param name="employeeArray">직원 배열</param> public EmployeeEnumerable(Employee[] employeeArray) { this.employeeArray = new Employee[employeeArray.Length]; for(int i = 0; i < employeeArray.Length; i++) { this.employeeArray[i] = employeeArray[i]; } } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Public #region 열거자 구하기 - IEnumerable.GetEnumerator() /// <summary> /// 열거자 구하기 /// </summary> /// <returns>열거자</returns> IEnumerator IEnumerable.GetEnumerator() { return (IEnumerator)GetEnumerator(); } #endregion #region 열거자 구하기 - GetEnumerator() /// <summary> /// 열거자 구하기 /// </summary> /// <returns>직원 열거자</returns> public EmployeeEnumerator GetEnumerator() { return new EmployeeEnumerator(this.employeeArray); } #endregion } |