为什么帖子编辑后我的控制器的数据会被重置

Question

在我的Post方法中对其进行编辑后，会重置一个处于控制状态的学生列表。

我进行了调试，以确保edit方法实际上在更改列表，并且确实如此。一旦我RedirectToAction（“ Index”），学生列表就会回到原始列表。

    public class StudentController : Controller
    {
        private List<Student> students = new List<Student>()
            {
                new Student() { Id = 0, Name = "John", Age = 18 },
                new Student() { Id = 1, Name = "Steve", Age = 21 },
                new Student() { Id = 2, Name = "Bill", Age = 25 },
                new Student() { Id = 3, Name = "Ram", Age = 20 },
                new Student() { Id = 4, Name = "Ron", Age = 31 },
                new Student() { Id = 5, Name = "Chris", Age = 17 },
                new Student() { Id = 6, Name = "Rob", Age = 19 },
            };

        public IActionResult Index()
        {
            return View(students);
        }

        public IActionResult Edit(int id)
        {
            Student std = students.Where(s => s.Id == id).FirstOrDefault();
            return View(std);
        }

        [HttpPost]
        public IActionResult Edit(Student std)
        {
            students[std.Id] = std;
            return RedirectToAction("Index");
        }
    }