Лабораторная работа №5. Лабораторная работа 5 коллекции, обобщения, linq методические указания к выполнению лабораторной работы 5
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Лабораторная работа №5 КОЛЛЕКЦИИ, ОБОБЩЕНИЯ, LINQ МЕТОДИЧЕСКИЕ УКАЗАНИЯ к выполнению лабораторной работы №5 Цель: Получить навыки работы с коллекциями, обобщениями и LINQ-запросами Оборудование: Персональный компьютер, среда разработки Visual Studio. Результат работы. По окончании выполнения лабораторной работы студент должен представить работоспособную программу в соответствии с заданием. Сдача лабораторной работы. Сдача лабораторной работы ведется в форме собеседования. Студент должен ответить на вопросы по теоретической части и по содержанию (коду) программы. Содержание отчета. Отчет по лабораторной работе должен быть оформлен в соответствии с правилами оформления отчетов и содержать код программы. Индивидуальные здания на лабораторную работу:
Варианты:
Исходный код примера: using System; using System.Collections; using System.Collections.Generic; using System.Linq; namespace Lab5 { class Program { static void Main() { try { var st1 = new Student { Weight = 60, Height = 190, FirstName = "Marie", LastName = "Little", University = "BSTU" }; var st2 = new Student { Weight = 54, Height = 172, FirstName = "Sue", LastName = "Jackson", University = "BSTU" }; var st3 = new Student { Weight = 54, Height = 181, FirstName = "Lance", LastName = "Knight", University = "BSU" }; var st4 = new Student { Weight = 78, Height = 184, FirstName = "Lance", LastName = "Stepth", University = "BSU" }; var st5 = new Student { Weight = 81, Height = 184, FirstName = "Wesley", LastName = "Jackson", University = "BSTU" }; var wr1 = new Worker { Weight = 67, Height = 190, FirstName = "Douglas", LastName = "Collins", Salary = 578.4 }; var wr2 = new Worker { Weight = 67, Height = 190, FirstName = "Lynn", LastName = "Gibson", Salary = 976.5 }; var wr3 = new Worker { Weight = 55, Height = 172, FirstName = "Olivi", LastName = "Smith", Salary = 493 }; var container1 = new HumanContainer container1.Remove(wr2); container1.Remove(st1); //container1[-1] = st1; //container1[6] = st1; //container1[1] = st1; foreach (var human in container1) { Console.WriteLine(human.ToString()); } var container2 = new HumanContainer container2.Add(st3); container2.Add(st4); container2.Add(st5); container2.Add(wr3); container2.Sort(); foreach (var human in container2) { Console.WriteLine(human.ToString()); } var list = new List list.Add(container1); list.Add(container2); //orderBy Console.WriteLine("\nLinq To objects: OrderBy, ThenBy"); var orderRes = container1.OrderBy(h => h.Height).ThenBy(h => h.Weight); foreach (var human in orderRes) Console.WriteLine(human); //where Console.WriteLine("\nLinq To objects: Where"); var whereRes = container1.Where(h => (h.Height > 170 && h.Weight >= 58) || h.FullName.StartsWith("L")); foreach (var human in whereRes) Console.WriteLine(human.ToString()); //select Console.WriteLine("\nLinq To objects: Select"); var selectRes = container1.Select((h, i) => new { Index = i + 1, h.FullName }); foreach (var el in selectRes) { Console.WriteLine(el); } //selectMany Console.WriteLine("\nLinq To objects: SelectMany"); var selectManyRes = container1.SelectMany(h => h.FullName.Split(' ')); foreach (var el in selectManyRes) Console.WriteLine(el); //Skip Console.WriteLine("\nLinq To objects: Skip"); var skipRes = container1.Skip(2); foreach (var human in skipRes) { Console.WriteLine(human); } //SkipWhile Console.WriteLine("\nLinq To objects: SkipWhile"); var skipWhileRes = container1.SkipWhile(h => h.Height < 190); foreach (var human in skipWhileRes) { Console.WriteLine(human); } //Take Console.WriteLine("\nLinq To objects: Take"); var takeRes = container1.Take(2); foreach (var human in takeRes) { Console.WriteLine(human); } //TakeWhile Console.WriteLine("\nLinq To objects: TakeWhile"); var takeWhileRes = container1.TakeWhile(h => h.Height < 190); foreach (var human in takeWhileRes) { Console.WriteLine(human); } //Concat Console.WriteLine("\nLinq To objects: Concat"); var concatRes = container1.Concat(container2); foreach (var human in concatRes) { Console.WriteLine(human); } //GroupBy Console.WriteLine("\nLinq To objects: GroupBy"); var groupByRes = concatRes.Where(h => h is Student).GroupBy(h => ((Student)h).University); foreach (var group in groupByRes) { Console.WriteLine($"Group: {group.Key}, Count: {group.Count()}"); foreach (var human in group) Console.WriteLine(human); } //First Console.WriteLine("\nLinq To objects: First"); var firstRes = concatRes.First(h => h.FullName.Length > 12); Console.WriteLine(firstRes); //FirstOrDefault Console.WriteLine("\nLinq To objects: FirstOrDefault"); var firstOrDefRes = concatRes.FirstOrDefault(h => h.FullName.Length > 14); if (firstOrDefRes != null) Console.WriteLine(); //DefaultIfEmpty Console.WriteLine("\nLinq To objects: DefaultIfEmpty"); var defaultIfEmptyRes = container2.Where(c => c.FirstName == "Eleanor") .DefaultIfEmpty(new Human { FirstName = "Eleanor", LastName = "Fuller" }) .First(); Console.WriteLine(defaultIfEmptyRes); //Min Console.WriteLine("\nLinq To objects: Min"); var minRes = container1.Min(h => h.Weight); Console.WriteLine(minRes); //Max Console.WriteLine("\nLinq To objects: Max"); var maxRes = container1.Max(h => h.Height); Console.WriteLine(maxRes); //Join Console.WriteLine("\nLinq To objects: Join"); var joinRes = container1.Join(container2, o => o.Height, i => i.Height, (o, i) => new Human { FirstName = o.FirstName + " " + i.FirstName, LastName = o.LastName + " " + i.LastName, Height = o.Height, Weight = (o.Weight + i.Weight) / 2 }); foreach (var human in joinRes) Console.WriteLine(human); //GroupJoin Console.WriteLine("\nLinq To objects: GroupJoin"); var groupJoinRes = container2.GroupJoin(container2, o => o.Height, i => i.Height, (o, i) => new { FullName = $"{o.FirstName} {o.LastName}", Count = i.Count(), TotalWeight = i.Sum(s => s.Weight) }); foreach (var human in groupJoinRes) { Console.WriteLine($"{human.FullName}: Count = {human.Count}, TotalWeight: { human.TotalWeight} "); } //All and Any Console.WriteLine("\nLinq To objects: All/Any"); var allAnyRes = list.First(c => c.All(h => h.Height > 160) && c.Any(h => h is Worker)) .Select(h => h.FirstName) .OrderByDescending(s => s); foreach (var name in allAnyRes) Console.WriteLine(name); //Contains Console.WriteLine("\nLinq To objects: Contains"); var containsRes = list.Where(c => c.Contains(wr3)) .SelectMany(c => c.SelectMany(h => h.FullName.Split(' '))) .Distinct() .OrderBy(s => s) .ToList(); foreach (var name in containsRes) Console.WriteLine(name); } catch (Exception ex) { Console.WriteLine(ex.Message); } } } public interface IHuman { string FirstName { get; set; } string LastName { get; set; } int Height { get; set; } double Weight { get; set; } } public class Human : IHuman, IComparable { #region Propeties public string FirstName { get; set; } public string LastName { get; set; } public int Height { get; set; } public double Weight { get; set; } public string FullName { get { return string.Format("{0} {1}", FirstName, LastName); } } #endregion #region Methods public int CompareTo(Human other) { return string.Compare(other.FullName, FullName, StringComparison.InvariantCultureIgnoreCase); } public override string ToString() { return string.Format("Class Human: \n FullName: {0}, Height: {1}, Width: {2}", FullName, Height, Weight); } #endregion } public class Worker : Human { #region Properties public double Salary { get; set; } #endregion #region Methods public void DoWork() { } public override string ToString() { return string.Format( "Class Worker: \n FullName: {0}, Height: {1}, Width: {2}, Salary: {3}", FullName, Height, Weight, Salary ); } #endregion } public class Student : Human { #region Properties public string University { get; set; } #endregion #region Methods public void DoStudy() { } public override string ToString() { return string.Format( "Class Student: \n FullName: {0}, Height: {1}, Width: {2}, University: { 3} ", FullName, Height, Weight, University ); } #endregion } public class HumanContainer { #region Fields private readonly List #endregion #region Constructors public HumanContainer() { _container = new List } #endregion #region Properties public int Count { get { return _container.Count; } } #endregion #region Indexers public T this[int index] { get { if (index < 0 || index >= Count) throw new IndexOutOfRangeException(); return _container[index]; } set { if (index < 0 || index >= Count) throw new IndexOutOfRangeException(); _container[index] = value; } } #endregion #region Methods public T GetByName(string name) { return _container.FirstOrDefault( h => string.Compare(h.FirstName, name, StringComparison.InvariantCultureIgnoreCase) == 0); } public void Add(T human) { _container.Add(human); } public T Remove(T human) { var element = _container.FirstOrDefault(h => h == human); if (element != null) { _container.Remove(element); return element; } throw new NullReferenceException(); } public void Sort() { _container.Sort(); } public IEnumerator { return _container.GetEnumerator(); } IEnumerator IEnumerable.GetEnumerator() { return GetEnumerator(); } #endregion } } |