在asp.net mvc的下拉列表选择视图中动态填充模型字段

public class Employee
{
    public int Id { get; set; }
    public string Name { get; set; }
    public int DepartmentId { get; set; }
    public Department Department { get; set; }
}

public class Department
{
    public int Id { get; set; }
    public string Name { get; set; }
}

public class EmployeeController : Controller
{
    private readonly ApplicationDbContext _context;

    public EmployeeController(ApplicationDbContext context)
    {
        _context = context;
    }

    public IActionResult Create()
    {
        var departments = _context.Departments.ToList();
        ViewBag.Departments = new SelectList(departments, "Id", "Name");
        return View();
    }

    [HttpPost]
    public IActionResult Create(Employee employee)
    {
        if (ModelState.IsValid)
        {
            _context.Add(employee);
            _context.SaveChanges();
            return RedirectToAction(nameof(Index));
        }
        return View(employee);
    }
}

@model YourNamespace.Employee

<form asp-action="Create">
    <div>
        <label asp-for="Name"></label>
        <input asp-for="Name" />
    </div>
    <div>
        <label asp-for="DepartmentId"></label>
        <select asp-for="DepartmentId" asp-items="ViewBag.Departments"></select>
    </div>
    <button type="submit">Submit</button>
</form>