我正在使用带有 MySQL db 的 ASP Core Web 应用程序、MVC、Code First。这是我的数据库的结构：
这是这两个模型/类的代码：
=====此代码适用于第二个 EmployeeDate 表（儿童）=====
[Table("employeedate")]
{
[Key]
[Required]
[Column("ID", TypeName = "int(10)")]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int ID { get; set; }
[Required]
[Column("HiredDate", TypeName = "date")]
public DateTime HiredDate { get; set; }
[Column("FiredDate", TypeName = "date")]
public DateTime? FiredDate { get; set; }
[Required]
//[Timestamp]
[Column("ModifiedDate", TypeName = "datetime")]
public DateTime ModifiedDate { get; set; }
[Required]
[Column("EmployeeID", TypeName = "int(10)")]
public int EmployeeID { get; set; }
// This attribute specifies which database field is the foreign key.
[ForeignKey(nameof(EmployeeID))]
// InverseProperty links the two virtual properties together.
[InverseProperty(nameof(Models.Employee.EmployeeDates))]
public virtual Employee Employee { get; set; }
}
=====This code is for 1st Employee Table (Parent) =====
[Table("employee")]
public class Employee
{
public Employee()
{
EmployeeDates = new HashSet<EmployeeDate>();
}
public string GetHiredDate
{
get
{
var hiredate = "this employee has never been hired";
if (EmployeeDates.LastOrDefault() != null)
{
hiredate = EmployeeDates.LastOrDefault().HiredDate.ToLongDateString();
}
return hiredate;
}
}
public string GetFiredDate
{
get
{
var firedate = "active";
if (EmployeeDates.LastOrDefault() != null && EmployeeDates.LastOrDefault().FiredDate.HasValue)
{
firedate = EmployeeDates.LastOrDefault().FiredDate.Value.ToLongDateString();
}
return firedate;
}
}
private DateTime hireddate = DateTime.Now;
public DateTime HiredDate
{
get
{
return hireddate;
}
}
public DateTime? FiredDate
{
get
{
DateTime? fireddate = null;
if (EmployeeDates.LastOrDefault() != null && EmployeeDates.LastOrDefault().FiredDate.HasValue)
{
fireddate = EmployeeDates.LastOrDefault().FiredDate.Value;
}
return fireddate;
}
}
[Key]
[Required]
[Column("ID", TypeName = "int(10)")]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int ID { get; set; }
[Required]
[Column("FirstName", TypeName = "varchar(60)")]
public string FirstName { get; set; }
[Required]
[Column("LastName", TypeName = "varchar(60)")]
public string LastName { get; set; }
[Required]
[Column("Email", TypeName = "varchar(100)")]
public string Email { get; set; }
[Required]
[Column("Phone", TypeName = "varchar(20)")]
public string Phone { get; set; }
[Required]
[Range (16, 100)]
[Column("Age", TypeName = "int(1)")]
public int Age { get; set; }
[Required]
[Column("City", TypeName = "varchar(100)")]
public string City { get; set; }
[Required]
[Column("Department", TypeName = "varchar(100)")]
public string Department { get; set; }
[InverseProperty(nameof(Models.EmployeeDate.Employee))]
public virtual ICollection<EmployeeDate> EmployeeDates { get; set; }
}
CREATE 方法工作正常，包括 HiredDate (Not FiredDate)。但 EDIT 仅适用于 Employee 属性， FiredDate 属性不起作用。我可以更新其他所有内容，例如名字、年龄等，但不能更新 FiredDate。
这是控制器内部的代码：
// GET: Employee/Create
public IActionResult Create(int ID =0)
{
return View(new Employee());
}
// POST: Employee/Create
// To protect from overposting attacks, enable the specific properties you want to bind to, for
// more details, see http://go.microsoft.com/fwlink/?LinkId=317598.
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Create(string firstName, string lastName, string email, string phone, int age, string city, string department, DateTime HiredDate)
{
//Nov20 add 2 objects and append HireDate separately from another Table
var employee = new Employee { FirstName = firstName, LastName = lastName, Email = email, Phone = phone, Age = age, City = city, Department = department };
var employeeDate = new EmployeeDate { HiredDate = HiredDate };
employee.EmployeeDates.Add(employeeDate);
if (ModelState.IsValid)
{
_context.Add(employee);
await _context.SaveChangesAsync();
return RedirectToAction(nameof(Index));
}
return View(employee);
}
// GET: Employee/Edit/5
public async Task<IActionResult> Edit(int? id)
{
if (id == null)
{
return NotFound();
}
var employee = await _context.Employees.FindAsync(id);
if (employee == null)
{
return NotFound();
}
return View(employee);
}
// POST: Employee/Edit/5
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Edit(int id, [Bind("ID,FirstName,LastName,Email,Phone,Age,City,Department,FiredDate")] Employee employee)
{
if (id != employee.ID)
{
return NotFound();
}
if (ModelState.IsValid)
{
try
{
_context.Update(employee);
await _context.SaveChangesAsync();
}
catch (DbUpdateConcurrencyException)
{
if (!EmployeeExists(employee.ID))
{
return NotFound();
}
else
{
throw;
}
}
return RedirectToAction(nameof(Index));
}
return View(employee);
}
最后查看：====编辑====
====创建====
顺便说一句，当在 Create View 中注释掉 FiredDate div 时（因为那里不需要它），我的项目无法立即构建。
关于我做错了什么的任何建议？我是这种 ASP Code First 方法的新手。这里还有一些照片：
