我的电影和客户之间有很多关系。但是每次我创建一个新客户并从下拉菜单中为该客户选择电影时，都会创建新客户，但电影版位为空，然后当我在数据库中检查我的电影表时，新电影将以空值创建来自新的电影ID。而我的CustomerMovie表（许多关系表）将具有针对新电影ID的新客户ID。为什么要通过吸引新客户来制作带有空值的新电影，并且不会将现有电影添加到客户中。
另外请注意，我对Razor @Html标签不是很熟悉，所以我只使用了普通的For循环，至少在现在对我来说更有意义。
这是我的客户模型
public class Customer
{
public Customer()
{
this.Movies = new HashSet<Movie>();
}
public int id { get; set; }
[StringLength(255)]
public String Name { get; set; }
public bool IsSubscribedToNewsletter { get; set; }
public int CurrentMembershipTypeId { get; set; }
public virtual MembershipType CurrentMembershipType { get; set;}
public virtual ICollection<Movie> Movies { get; set; }
}
这是我的电影模特
public class Movie
{
public Movie()
{
this.Customers = new HashSet<Customer>();
}
public int Id { get; set; }
//[Required(ErrorMessage = "Name must be specified")]
public string Name { get; set; }
public virtual ICollection<Customer> Customers { get; set; }
}
}
这是我的上下文类：
public class CustomerContext : DbContext
{
public CustomerContext() : base("CustomerContext")
{
}
public DbSet<MembershipType> MembershipTypes { get; set; }
public DbSet<Customer> Customers { get; set; }
public DbSet<Movie> Movies { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Customer>()
.HasMany<Movie>(s => s.Movies)
.WithMany(c => c.Customers)
.Map(cs =>
{
cs.MapLeftKey("CustomerId");
cs.MapRightKey("MovieId");
cs.ToTable("CustomersMovies");
});
modelBuilder.Entity<Customer>()
.HasRequired<MembershipType>(s => s.CurrentMembershipType)
.WithMany(g => g.Customers)
.HasForeignKey<int>(s => s.CurrentMembershipTypeId);
}
}
这是客户控制者：
public class CustomerController : Controller
{
// private ICustomerRepository iCustomerRepository;
ICustomerRepository iCustomerRepository = new CustomerRepository(new CustomerContext());
IMembershipTypeRepository iMembershipTypeRepository = new MembershipTypeRepository(new CustomerContext());
IMovieRepository imovieRepository = new MovieRepository(new CustomerContext());
CustomerContext CustomerContext = new CustomerContext();
// GET: Customers
public ActionResult Customer()
{
var customers = CustomerContext.Customers.Include(c => c.Movies);
var Customers = customers.ToList();
return View(Customers);
}
//public ActionResult CustomerForm(Customer Customer)
public ActionResult CustomerForm(Customer customer)
{
var membershipTypes = iMembershipTypeRepository.GetMembershipTypes();
var Movie = imovieRepository.GetMovies();
ViewBag.Message = "Customers form is going to display: ";
CustomerViewModel customerViewModel = new CustomerViewModel
{
MembershipTypes = CustomerContext.MembershipTypes,
Movies = CustomerContext.Movies,
};
if (customer.IsSubscribedToNewsletter != true)
ViewBag.Addon = "Selected";
else
ViewBag.Addon = "Not Selected";
return View(customerViewModel);
}
public ActionResult Edit(int id)
{
Customer Customer = new Customer();
Customer = iCustomerRepository.GetCustomerByID(id);
CustomerViewModel customer = new CustomerViewModel
{
MembershipTypes = CustomerContext.MembershipTypes,
Movies = CustomerContext.Movies,
Customer = Customer
};
return View(customer);
}
[HttpPost]
public ActionResult CustomerForm(int CustomerId, string CustomerName, bool CustomerisSubscribedToNewsLetter, int membershipTypeId, Movie movie)
{
Customer customer = new Customer();
// Movie Movie = new Movie();
customer.id = CustomerId;
customer.Name = CustomerName;
customer.IsSubscribedToNewsletter = CustomerisSubscribedToNewsLetter;
customer.CurrentMembershipTypeId = membershipTypeId;
customer.Movies.Add(movie);
movie.Customers.Add(customer);
iCustomerRepository.InsertCustomer(customer);
// imovieRepository.InsertMovie(movie);
iCustomerRepository.Save();
// imovieRepository.Save();
return RedirectToAction("Customer");
}
[HttpPost]
public ActionResult Edit(int CustomerId, string CustomerName, bool CustomerIsSubscribedToNewsLetter, int membershipTypeId, IList<Movie> movie)
{
Customer Customer = new Customer();
Customer.id = CustomerId;
Customer.Name = CustomerName;
Customer.IsSubscribedToNewsletter = CustomerIsSubscribedToNewsLetter;
Customer.CurrentMembershipTypeId = membershipTypeId;
Customer.Movies = movie;
iCustomerRepository.UpdateCustomer(Customer);
iCustomerRepository.Save();
//CustomerContext.Movies.AddRange(movie);
imovieRepository.Save();
CustomerContext.SaveChanges();
return RedirectToAction("Customer");
}
[HttpPost]
public ActionResult Delete(int id)
{
Customer customer = new Customer();
customer = iCustomerRepository.GetCustomerByID(id);
iCustomerRepository.DeleteCustomer(customer.id);
iCustomerRepository.Save();
return RedirectToAction("Customer");
}
}
这是我的电影控制器，目前仅列出所有功能：
public class MovieController : Controller
{
IMovieRepository iMovieRepository = new MovieRepository(new CustomerContext());
ICustomerRepository iCustomerRepository = new CustomerRepository(new CustomerContext());
CustomerContext CustomerContext = new CustomerContext();
public ActionResult Movie()
{
var Movies = iMovieRepository.GetMovies();
//var movies = CustomerContext.Movies.Include(s => s.Customers);
return View(Movies);
}
}
这是客户窗体视图：
@model WebApplication2.ViewModel.CustomerViewModel
@*<h4>
<b>ID:</b> @ViewBag.id <br />
<b>Name:</b> @ViewBag.Name <br />
<b>Addon:</b> @ViewBag.Addon <br />
</h4>
<h2>CustomerForm</h2>
<form action="/Customer/CustomerForm" method="post">
<table>
<tr>
<td>Id:</td>
<td><input id="CustomerId" type="text" name="CustomerId" /></td>
</tr>
<tr>
<td>Name:</td>
<td><input id="CustomerName" type="text" name="CustomerName" /></td>
</tr>
<tr>
<td>IsSubscribedToNewLetter:</td>
<td><input id="CustomerisSubscribedToNewsLetter" type="text" name="CustomerisSubscribedToNewsLetter" /></td>
</tr>
<tr>
<td>MembershipType:</td>
<td>
<select id="MembershipTypeId" name="MembershipTypeId">
@foreach (var membershipType in @Model.MembershipTypes)
{
<option value=@membershipType.Id>
@*@membershipType.SignupFee*@
@membershipType.Id
</option>
}
</select>
</td>
</tr>
<tr>
<td>Movie:</td>
<td>
<select id="MovieId" name="MovieId">
@*@Html.ListBoxFor(model => model.MovieId, Model.AllMovies, new { size = 8 })*@
@foreach (var movie in Model.Movies)
{
<option value=@movie.Id>
@movie.Name
</option>
}
</select>
</td>
</tr>
</table>
<input type="submit" value="save"/>
</form>
以下是我的客户视图：
@model IEnumerable<WebApplication2.Models.Customer>
@{
ViewBag.Title = "Customers";
}
<p>
@Html.ActionLink("Create New", "CustomerForm")
</p>
<table>
<tr>
<th></th>
<th>Number</th>
<th>Name</th>
<th>Subscription</th>
<th>MembershipType signup fee</th>
<th>Movies</th>
</tr>
@foreach (var item in Model)
{
<tr>
<td>
@Html.ActionLink("Edit", "Edit", new { id = item.id }) |
@Html.ActionLink("Details", "Details", new { id = item.Name }) |
@*@Html.ActionLink("Delete", "Delete", new { id = item.id }, new { onclick = "return confirm('Are you sure you wish to delete this article?');" })*@
@*<p><a href="/Customer/Edit/@item.id">Edit Customer</a></p>*@
<form method="post" action="/Customer/delete/@item.id">
<input type="submit" value="delete" />
</form>
</td>
<td>
@Html.DisplayFor(modelItem => item.id)
</td>
<td>
@Html.DisplayFor(modelItem => item.Name)
</td>
<td>
@Html.DisplayFor(modelItem => item.IsSubscribedToNewsletter)
</td>
<td>
@Html.DisplayFor(modelItem => item.CurrentMembershipType.SignupFee)
</td>
<td>
@foreach (var movie in item.Movies)
{
@movie.Name
}
</td>
</tr>
}
</table>