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| using System; using NUnit.Framework; using System.Collections.Generic; using System.Linq;
namespace LinqQueryTest { public class LinqCollectionObject { [Test] public void CollectionOfObjects() { var scores = Student.QueryHighScores(1, 90);
scores.ForEach(Console.WriteLine);
Assert.AreEqual(4, scores.Count);
} }
public class Student { #region data
public enum GradeLevel { FirstYear = 1, SecondYear, ThirdYear, FourthYear };
public string FirstName { get; set; } public string LastName { get; set; } public int Id { get; set; } public GradeLevel Year; public List<int> ExamScores;
protected static List<Student> students = new List<Student> { new Student { FirstName = "Terry", LastName = "Adams", Id = 120, Year = GradeLevel.SecondYear, ExamScores = new List<int> {99, 82, 81, 79} }, new Student { FirstName = "Fadi", LastName = "Fakhouri", Id = 116, Year = GradeLevel.ThirdYear, ExamScores = new List<int> {99, 86, 90, 94} }, new Student { FirstName = "Hanying", LastName = "Feng", Id = 117, Year = GradeLevel.FirstYear, ExamScores = new List<int> {93, 92, 80, 87} }, new Student { FirstName = "Cesar", LastName = "Garcia", Id = 114, Year = GradeLevel.FourthYear, ExamScores = new List<int> {97, 89, 85, 82} }, new Student { FirstName = "Debra", LastName = "Garcia", Id = 115, Year = GradeLevel.ThirdYear, ExamScores = new List<int> {35, 72, 91, 70} }, new Student { FirstName = "Hugo", LastName = "Garcia", Id = 118, Year = GradeLevel.SecondYear, ExamScores = new List<int> {92, 90, 83, 78} }, new Student { FirstName = "Sven", LastName = "Mortensen", Id = 113, Year = GradeLevel.FirstYear, ExamScores = new List<int> {88, 94, 65, 91} }, new Student { FirstName = "Claire", LastName = "O'Donnell", Id = 112, Year = GradeLevel.FourthYear, ExamScores = new List<int> {75, 84, 91, 39} }, new Student { FirstName = "Svetlana", LastName = "Omelchenko", Id = 111, Year = GradeLevel.SecondYear, ExamScores = new List<int> {97, 92, 81, 60} }, new Student { FirstName = "Lance", LastName = "Tucker", Id = 119, Year = GradeLevel.ThirdYear, ExamScores = new List<int> {68, 79, 88, 92} }, new Student { FirstName = "Michael", LastName = "Tucker", Id = 122, Year = GradeLevel.FirstYear, ExamScores = new List<int> {94, 92, 91, 91} }, new Student { FirstName = "Eugene", LastName = "Zabokritski", Id = 121, Year = GradeLevel.FourthYear, ExamScores = new List<int> {96, 85, 91, 60} } };
#endregion
protected static int GetPercentile(Student s) { double avg = s.ExamScores.Average(); return avg > 0 ? (int) avg / 10 : 0; }
public static List<ScoreResult> QueryHighScores(int exam, int score) { var highScores = from student in students where student.ExamScores[exam] > score select new ScoreResult {Name = student.FirstName, Score = student.ExamScores[exam]};
return highScores.ToList(); } }
public record ScoreResult { public string Name { get; set; }
public int Score { get; set; } } }
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