public string FirstName { get; set; }
public string LastName { get; set; }
public int ID { get; set; }
public GradeLevel? Year { get; set; }
public List
ExamScores { get; set; }
public Student(string FirstName, string LastName, int ID, GradeLevel Year, List ExamScores)
this.FirstName = FirstName;
this.LastName = LastName;
this.ID = ID;
this.Year = Year;
this.ExamScores = ExamScores;
public Student(string FirstName, string LastName, int StudentID, List? ExamScores = null)
this.FirstName = FirstName;
this.LastName = LastName;
ID = StudentID;
this.ExamScores = ExamScores ?? Enumerable.Empty().ToList();
public static List students = new()
FirstName: "Terry", LastName: "Adams", ID: 120,
Year: GradeLevel.SecondYear,
ExamScores: new() { 99, 82, 81, 79 }
"Fadi", "Fakhouri", 116,
GradeLevel.ThirdYear,
new() { 99, 86, 90, 94 }
"Hanying", "Feng", 117,
GradeLevel.FirstYear,
new() { 93, 92, 80, 87 }
"Cesar", "Garcia", 114,
GradeLevel.FourthYear,
new() { 97, 89, 85, 82 }
"Debra", "Garcia", 115,
GradeLevel.ThirdYear,
new() { 35, 72, 91, 70 }
"Hugo", "Garcia", 118,
GradeLevel.SecondYear,
new() { 92, 90, 83, 78 }
"Sven", "Mortensen", 113,
GradeLevel.FirstYear,
new() { 88, 94, 65, 91 }
"Claire", "O'Donnell", 112,
GradeLevel.FourthYear,
new() { 75, 84, 91, 39 }
"Svetlana", "Omelchenko", 111,
GradeLevel.SecondYear,
new() { 97, 92, 81, 60 }
"Lance", "Tucker", 119,
GradeLevel.ThirdYear,
new() { 68, 79, 88, 92 }
"Michael", "Tucker", 122,
GradeLevel.FirstYear,
new() { 94, 92, 91, 91 }
"Eugene", "Zabokritski", 121,
GradeLevel.FourthYear,
new() { 96, 85, 91, 60 }
enum GradeLevel
FirstYear = 1,
SecondYear,
ThirdYear,
FourthYear
以下查询将返回在第一堂考试中得分为 90 或更高的学生。
void QueryHighScores(int exam, int score)
var highScores =
from student in students
where student.ExamScores[exam] > score
select new
Name = student.FirstName,
Score = student.ExamScores[exam]
foreach (var item in highScores)
Console.WriteLine($"{item.Name,-15}{item.Score}");
QueryHighScores(1, 90);
该查询有意简单，以使你可以进行实验。 例如，你可以在
where
子句中尝试其他条件或使用
orderby
子句对结果进行排序。
语言集成查询 (LINQ)
字符串内插
