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我創建的應用程序是員工輸入他們的名/姓，從下拉列表中選擇他們的Department和Appointment。 CRUD操作一切正常。ASP.NET Core 2.0檢索/刪除DropDownList值
但是，我需要從約會下拉列表中刪除已分配給員工的值。每個約會只能有一名員工。所以，我需要在用戶選擇一個後從Appointments下拉列表中刪除Appointments。
我使用ASP.NET 2.0的核心，C＃，EntityFrameworkCore代碼第一次和SQL Server 2016
我附上我的代碼，我現在如果有人能盡力協助。先謝謝你！
模型
public class Employee
{
public int EmployeeID { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public int DepartmentID { get; set; }
public Department Department { get; set; }
public int AppointmentID { get; set; }
public Appointment Appointment { get; set; }
}
public class Department
{
public int DepartmentID { get; set; }
public string Name { get; set; }
public ICollection<Employee> Employees { get; set; }
}
public class Appointment
{
public int AppointmentID { get; set; }
public string TimeSlot { get; set; }
public ICollection<Employee> Employees { get; set; }
}
的ViewModels
public class EmployeeFormVM
{
public int EmployeeID { get; set; }
[Required(ErrorMessage = "Please enter your First Name")]
[Display(Name = "First Name")]
[StringLength(50)]
public string FirstName { get; set; }
[Required(ErrorMessage = "Please enter your Last Name")]
[Display(Name = "Last Name")]
[StringLength(50)]
public string LastName { get; set; }
[Required(ErrorMessage = "Please select your Department")]
[Display(Name = "Department")]
public int DepartmentID { get; set; }
public IEnumerable<Department> Departments { get; set; }
[Required(ErrorMessage = "Please select your Appointment")]
[Display(Name = "Appointment")]
public int AppointmentID { get; set; }
public IEnumerable<Appointment> Appointments { get; set; }
}
的DbContext
public class WinTenDbContext : DbContext
{
public WinTenDbContext(DbContextOptions<WinTenDbContext> options) : base(options)
{
}
public DbSet<Employee> Employees { get; set; }
public DbSet<Department> Departments { get; set; }
public DbSet<Appointment> Appointments { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<Employee>()
.HasKey(e => e.EmployeeID);
modelBuilder.Entity<Employee>()
.Property(e => e.FirstName)
.HasColumnType("varchar(50)")
.HasMaxLength(50)
.IsRequired();
modelBuilder.Entity<Employee>()
.Property(e => e.LastName)
.HasColumnType("varchar(50)")
.HasMaxLength(50)
.IsRequired();
modelBuilder.Entity<Department>()
.HasKey(d => d.DepartmentID);
modelBuilder.Entity<Department>()
.Property(d => d.Name)
.HasColumnType("varchar(50)")
.HasMaxLength(50);
modelBuilder.Entity<Appointment>()
.HasKey(a => a.AppointmentID);
modelBuilder.Entity<Appointment>()
.Property(a => a.TimeSlot)
.HasColumnType("varchar(50)")
.HasMaxLength(50);
}
}
EmployeesController
public class EmployeesController : Controller
{
private readonly WinTenDbContext _context;
public EmployeesController(WinTenDbContext context)
{
_context = context;
}
// GET: Employees and their Departments
public async Task<IActionResult> Index()
{
var webAppDbContext = _context.Employees.Include(d => d.Department).Include(a => a.Appointment);
return View(await webAppDbContext.ToListAsync());
}
// GET: Employees/Details/5
public async Task<IActionResult> Details(int? id)
{
if (id == null)
{
return NotFound();
}
var employee = await _context.Employees
.SingleOrDefaultAsync(m => m.EmployeeID == id);
if (employee == null)
{
return NotFound();
}
return View(employee);
}
// GET: Employees/Create
public IActionResult Create()
{
var departments = _context.Departments.ToList();
var appointments = _context.Appointments.ToList();
var viewModel = new EmployeeFormVM
{
Departments = departments,
Appointments = appointments
};
return View(viewModel);
}
// POST: Employees/Create
// To protect from overposting attacks, please 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(EmployeeFormVM employee)
{
if (ModelState.IsValid)
{
var emp = new Employee();
{
emp.FirstName = employee.FirstName;
emp.LastName = employee.LastName;
emp.DepartmentID = employee.DepartmentID;
emp.AppointmentID = employee.AppointmentID;
}
// Query DB to check if Employee exists with same First/Last Name
Employee existingEmployee = await _context.Employees.SingleOrDefaultAsync(m => m.FirstName == employee.FirstName && m.LastName == employee.LastName);
if (existingEmployee != null)
{
// Display Error if duplicate employee
ModelState.AddModelError(string.Empty, "An employee with this name has already registered");
employee.Departments = _context.Departments.ToList();
employee.Appointments = _context.Appointments.ToList();
return View(employee);
}
// Query DB to check if appointment has already been assigned to an employee
Employee existingAppointment = await _context.Employees.SingleOrDefaultAsync(m => m.AppointmentID == employee.AppointmentID);
if (existingAppointment != null)
{
// Display error if the appointment was already chosen
ModelState.AddModelError(string.Empty, "This appointment has already been taken. Please select another timeslot.");
employee.Departments = _context.Departments.ToList();
employee.Appointments = _context.Appointments.ToList();
return View(employee);
}
_context.Add(emp);
await _context.SaveChangesAsync();
return RedirectToAction(nameof(Index));
}
return View(employee);
}
// GET: Employees/Edit/5
public async Task<IActionResult> Edit(int? id)
{
if (id == null)
{
return NotFound();
}
var employeevm = new EmployeeFormVM();
{
Employee employee = await _context.Employees.SingleOrDefaultAsync(m => m.EmployeeID == id);
if (employee == null)
{
return NotFound();
}
employeevm.EmployeeID = employee.EmployeeID;
employeevm.FirstName = employee.FirstName;
employeevm.LastName = employee.LastName;
// Retrieve list of Departments
var departments = _context.Departments.ToList();
employeevm.Departments = departments;
// Set the selected department
employeevm.DepartmentID = employee.DepartmentID;
// Retrieve list of Appointments
var appointments = _context.Appointments.ToList();
employeevm.Appointments = appointments;
// Set the selected department
employeevm.AppointmentID = employee.AppointmentID;
}
return View(employeevm);
}
// POST: Employees/Edit/5
// To protect from overposting attacks, please 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> Edit(EmployeeFormVM vmEdit)
{
if (ModelState.IsValid)
{
Employee employee = _context.Employees.SingleOrDefault(e => e.EmployeeID == vmEdit.EmployeeID);
if (employee == null)
{
return NotFound();
}
employee.FirstName = vmEdit.FirstName;
employee.LastName = vmEdit.LastName;
employee.DepartmentID = vmEdit.DepartmentID;
employee.AppointmentID = vmEdit.AppointmentID;
try
{
_context.Update(employee);
await _context.SaveChangesAsync();
}
catch (DbUpdateConcurrencyException)
{
if (!EmployeeExists(vmEdit.EmployeeID))
{
return NotFound();
}
else
{
throw;
}
}
return RedirectToAction(nameof(Index));
}
return View(vmEdit);
}
// GET: Employees/Delete/5
public async Task<IActionResult> Delete(int? id)
{
if (id == null)
{
return NotFound();
}
var employee = await _context.Employees
.SingleOrDefaultAsync(m => m.EmployeeID == id);
if (employee == null)
{
return NotFound();
}
return View(employee);
}
// POST: Employees/Delete/5
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public async Task<IActionResult> DeleteConfirmed(int id)
{
var employee = await _context.Employees.SingleOrDefaultAsync(m => m.EmployeeID == id);
_context.Employees.Remove(employee);
await _context.SaveChangesAsync();
return RedirectToAction(nameof(Index));
}
private bool EmployeeExists(int id)
{
return _context.Employees.Any(e => e.EmployeeID == id);
}
}
創建視圖
@using (Html.BeginForm("Create", "Employees"))
{
@Html.ValidationSummary(true, "", new { @class = "validation-summary-errors" })
//@Html.ValidationSummary(true, "", new { @style = "color: #cc0000" })
//@Html.ValidationSummary(true)
<div class="form-group">
@Html.LabelFor(e => e.FirstName)
@Html.TextBoxFor(e => e.FirstName, new { @class = "form-control" })
@Html.ValidationMessageFor(e => e.FirstName)
</div>
<div class="form-group">
@Html.LabelFor(e => e.LastName)
@Html.TextBoxFor(e => e.LastName, new { @class = "form-control" })
@Html.ValidationMessageFor(e => e.LastName)
</div>
<div class="form-group">
@Html.LabelFor(d => d.DepartmentID)
@Html.DropDownListFor(d => d.DepartmentID, new SelectList(Model.Departments, "DepartmentID", "Name"), "", new { @class = "form-control" })
@Html.ValidationMessageFor(d => d.DepartmentID)
</div>
<div class="form-group">
@Html.LabelFor(a => a.AppointmentID)
@Html.DropDownListFor(a => a.AppointmentID, new SelectList(Model.Appointments, "AppointmentID", "TimeSlot"), "", new { @class = "form-control" })
@Html.ValidationMessageFor(a => a.AppointmentID)
</div>
<div class="form-group">
<button type="submit" class="btn btn-primary">Submit</button>
</div>
}
編輯視圖
@using (Html.BeginForm("Edit", "Employees"))
{
<div class="form-group">
@Html.LabelFor(e => e.FirstName)
@Html.TextBoxFor(e => e.FirstName, new { @class = "form-control" })
@Html.ValidationMessageFor(e => e.FirstName)
</div>
<div class="form-group">
@Html.LabelFor(e => e.LastName)
@Html.TextBoxFor(e => e.LastName, new { @class = "form-control" })
@Html.ValidationMessageFor(e => e.LastName)
</div>
<div class="form-group">
@Html.LabelFor(d => d.DepartmentID)
@Html.DropDownListFor(d => d.DepartmentID, new SelectList(Model.Departments, "DepartmentID", "Name"), "", new { @class = "form-control" })
@Html.ValidationMessageFor(d => d.DepartmentID)
</div>
<div class="form-group">
@Html.LabelFor(a => a.AppointmentID)
@Html.DropDownListFor(a => a.AppointmentID, new SelectList(Model.Appointments, "AppointmentID", "TimeSlot"), "", new { @class = "form-control" })
@Html.ValidationMessageFor(a => a.AppointmentID)
</div>
@Html.HiddenFor(e => e.EmployeeID)
<div class="form-group">
<button type="submit" class="btn btn-primary">Submit</button>
</div>
}
添加一個字段isFilled，當僱員選擇一個約會，你填充它並過濾該 –
@ johnny5，有沒有一種方法或查詢當它首次檢索約會值時，我可以首先檢查Employees表，並僅根據AppointmentID加載不在Employees表中的Appointment值。 – Brian
@Brian，你能否重新評論你的評論？您是否只想過濾沒有關聯員工的約會？ – ironstone13