当我运行代码时,我的HttpGet方法似乎运行良好。但是,当我尝试将值返回到HttpPost操作时,它仅运行HttpGet方法,然后出现“ NullReferenceException”错误。
这是我的代码。
我在控制器中的操作:
[HttpGet]
public IActionResult AddMovie(int? id)
{
List<Movie> movieList = new List<Movie>();
movieList = dbContext.Movies.ToList();
AddMovieViewModel viewModel = new AddMovieViewModel()
{
movies = movieList,
customer = dbContext.Customers.Where(s => s.CustomerId == id).FirstOrDefault()
};
return View(viewModel);
}
[HttpPost]
public IActionResult AddMovie (int id,int cid)
{
Customer customer = dbContext.Customers.Where(s => s.CustomerId == cid).FirstOrDefault();
Movie movie = dbContext.Movies.Where(s => s.MovieId == id).FirstOrDefault();
customer.BorrowingMovies.Add(movie);
customer.BorrowingMovies.Add(movie);
return View();
}
这是我的看法
@model MovieExampleAppDotNetCore.ViewModels.AddMovieViewModel
@{
ViewData["Title"] = "AddMovie";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<h1>AddMovie</h1>
<label>Add movie for: @Model.customer.Name</label>
<table style="width:100%" class="table table-bordered table-hover">
<tr>
<th>Name</th>
</tr>
@foreach (var movie in Model.movies)
{
<tr>
<td>@movie.Name</td>
<td>
@Html.ActionLink("Select", "AddMovie", new { id = movie.MovieId, cid = Model.customer.CustomerId })
</td>
</tr>
}
</table>
我希望有人可以帮助我解决我的问题。
最佳答案
HTML ActionLink不适用于POST,因此正在命中GET方法。请参见this question。
要解决并解决您的问题,请将按钮包装在表单中,这样的技巧应该可以解决。
@using (Html.BeginForm("AddMovie", "ControllerName", new { id = movie.MovieId, cid = Model.customer.CustomerId }, FormMethod.Post))
{
<button class="btn btn-primary" type="submit">
Add Movie
</button>
}
关于c# - 不调用HttpPost方法,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/60561464/