C# 如何在方法中检索List的数据

Question

I have a method that gets data of students:

    public static List<Student> getStudentInfo()
    {

        List<Student> students = new List<Student>();
        students.Add(new Student(1, "Doe", "John", "someData"));
        students.Add(new Student(2, "Pit", "Brat", "someData1"));
        students.Add(new Student(5, "Kardasian", "Kim", "someData2"));
        students.Add(new Student(4, "Lee", "Chun", "someData"));
        .
        .
        return students;
    }

    foreach (Student s in students)
     Console.WriteLine(s);

I am trying to create a method that retrieves the data above using foreach (Student s in students) Console.WriteLine(s); , but I cannot get and print the data.

How do I access the list in a method?

Answer 1

Option 1. Override ToString()

Please see How to: Override the ToString Method (C# Programming Guide)

 class Person { public string Name { get; set; } public int Age { get; set; } public override string ToString() { return "Person: " + Name + " " + Age; } }

Option 2. Print the fields separately

foreach (Student s in students)
     Console.WriteLine($"{s.Id} {s.SomeData}");

---

var students = getStudentInfo();
foreach (Student s in students)
Console.WriteLine(s); // `Student` doesn't override ToString(), this will be the name of the class.

foreach (Student s in students)
Console.WriteLine($"{s.Id}, {s.Name}"); 

Output

Program+Student
Program+Student
Program+Student
Program+Student
1, Doe
2, Pit
5, Kardasian
4, Lee