使用 mvc5 Web 应用程序将多行插入数据库

Question

我正在尝试添加多行数据并将其传递到数据库中的表以及另一个项目到不同的表。下面是数据库的结构：

User Table

userid
name

Movie Table

Movieid
userid
moviename

Cinema Table
Movieid
cinemaid
location
time

movietable 与 Cinema 表有一对多的关系。用户表有一个，我有四个不同的视图模型与之关联：

UserViewModel
{
    public int userid;
    public string name;
}

MoviewViewModel
{
    public int movieid;
    public int userid;
    public string moviename;
    public List<CinemaViewModel> cinema;
}

CinemaViewModel
{
    public int movieid;
    public int cinemaid;
    public string location;
    public string time;
}

UserandMovieViewModel
{
    public List<MoviewViewModel> movie;
    public UserViewModel user;
}

我将 userandmoviewmodel 从控制器创建传递到视图，并想为用户和电影添加一个条目，但想从该单个页面向 Cinema 数据库添加多个条目。当我向电影院添加一个条目时，它工作正常。但是，我希望能够在发布表单时向电影院表添加多个条目。我已经尝试过下面的教程，但这似乎不适用于创建。

http://ivanz.com/2011/06/16/editing-variable-length-reorderable-collections-in-asp-net-mvc-part-1/

编辑

给出空异常的代码

 <ul id="movieEditor" style="list-style-type: none">
   @foreach (CinemaViewModel cinemamodel in Model.UserandMovieViewModel.cinema) {
    Html.RenderPartial("MovieEntryEditor", cinemamodel);
      }
 </ul>
 <a id="addAnother" href="#">Add another</a>

EDIT2

创建控制器代码

[httpget]
public ActionResult Create()
{

 UserViewModel usermodel = new UserviewModel();
 List<MovieViewModel> moviemodel= new List<MovieViewModel>();

 UserandMovieViewModel model = new UserandMovieViewmodel{user = usermodel, movie=moviemodel }


 return View(model)
 }

  [httppost]
   public ActionResult Create(UserandMovieViewmodel model)
   {

   IRepository<User> userrep = new ApplicationRepository<User>();
   IRepository<Movie> userrep = new ApplicationRepository<Movie>();
   IRepository<Cinema> userrep = new ApplicationRepository<Cinema>();

    User user = null;
    Movie movie = null;
    Cinema cinema = null;

    UserViewModel usermodel = model.usermodel;
    MovieViewModel moviemodel= model.moviemodel;
    CinemaViewModel cinemamodel = model.moviemodel.cinema;


    if(ModelState.valid)

    {

     user = new user();

      user.name = usermodel.name;
       userrep.add(user);


      movie = new movie();

      movie.userid = user.userid; (gets from database as its autoappend)
      movie.moviename = moviemodel.moviename;

      movierep.Add(movie);

       cinema = new cinema();

       cinema.movieid = movie.movieid;
        cinema.location = cinemamodel.location;
        cinema.time = cinemamodel.time;

        cinemarep.Add(cinema);

      }

    return View(model);




       }

我已经从内存中编写了代码，因为我目前没有它。请更正您看到的任何错误。

编辑 3

局部视图

@model Application.ViewModels.CinemaViewModel



<li style="padding-bottom:15px">

   <div style="width: 450px; float: left;">
    <label class="location">
      Location
    </label>
    <span style="margin-left: 26px;">
        @Html.TextBoxFor(model => model.location)
        @Html.ValidationMessageFor(model => model.location)
    </span>


    <span>
        @Html.TextBoxFor(model => model.time)
        @Html.ValidationMessageFor(model => model.time)
    </span>

</div>

Answer 1

我怀疑你的列表为空，所以你可以尝试在构造函数中新建它：

public class MoviewViewModel
{
    public MoviewViewModel(){
       cinema = new List<CinemaViewModel>();
    }
    public int movieid;
    public int userid;
    public string moviename;
    public List<CinemaViewModel> cinema;
}

public class UserandMovieViewModel
{
    public UserandMovieViewModel(){
        movie = new List<MoviewViewModel>();
    }
    public List<MoviewViewModel> movie;
    public UserViewModel user;
}

编辑： 您的看法：

<ul id="movieEditor" style="list-style-type: none">
   @if(Model.UserandMovieViewModel.cinema.Any())
   {
       foreach (CinemaViewModel cinemamodel in Model.UserandMovieViewModel.cinema) {
         Html.RenderPartial("MovieEntryEditor", cinemamodel);
        }
   }
   else
   {
       @{ Html.RenderPartial("MovieEntryEditor", new CinemaViewModel()) };
   }
 </ul>
 <a id="addAnother" href="#">Add another</a>