表单提交时，Controller action方法的model参数为空

我在Movie控制器中有一个动作方法ReleasingTheaters，ReleasingTheaters有两个重载，一个是httpGet，它接受Movie Id并做东西并返回ReleasingTheaters View，它接受一个ViewModel对象。当我通过点击提交提交表单时，ReleasingTheaters视图按钮，控制器的另一个http Post动作方法ReleasingTheaters接受viewModel并将模型数据保存到数据库。

这是我的viewModel：

public class MovieReleasingTheatersViewModel { public MovieReleasingTheatersViewModel() { AvailableStates = new List(); AvailableCities = new List(); AvailableLocations = new List(); ReleasingTheaters = new List(); } [Display(Name="State")] public int? StateId { get; set; } public IList AvailableStates { get; set; } [Display(Name = "City")] public int? CityId { get; set; } public IList AvailableCities { get; set; } public int? LocationId { get; set; } public IList AvailableLocations { get; set; } public IList ReleasingTheaters { get; set; } } 

这是我的控制：

  [HttpGet] public ActionResult ReleasingTheaters(int id) { var model = new MovieReleasingTheatersViewModel(); model = PrepareMovieReleasingTheaterModel(0, 0, 0, id); return View(model); } [HttpPost] [ValidateAntiForgeryToken] public ActionResult ReleasingTheaters(MovieReleasingTheatersViewModel model) { // iterate through the model's collection and save or update database return View("Index"); } 

这是我的释放剧院观点：

  @model Bookmany.Admin.Models.Movie.MovieReleasingTheatersViewModel @{ ViewBag.Title = "Releasing Theaters"; } 
Releasing Theaters
 @using (Html.BeginForm()) { @Html.AntiForgeryToken() 
 
 
 @Html.DropDownListFor(model => model.StateId, Model.AvailableStates, "Select State") 
 
 @Html.DropDownListFor(model => model.CityId, Model.AvailableCities, "Select City") 
 
 @Html.DropDownListFor(model => model.LocationId, Model.AvailableLocations, "Select Location") 
 
 
 
  @foreach (var item in Model.ReleasingTheaters) {  } 
 
 
 
 Theater 
 
 Date From 
 
 Date To 
 
 Release 
 
 
 
 
 
 @Html.DisplayFor(modelItem => item.TheaterName) 
 
 @Html.TextBoxFor(modelItem => item.DateFrom, new { id = "DateFrom" }) 
 
 @Html.TextBoxFor(modelItem => item.DateTo, new { id = "DateTo" }) 
 
 @Html.EditorFor(modelItem => item.IsTheaterChecked) 
 
 
 
 
  
 
 } 

我的问题 ：

当我单击提交按钮时，对象on action方法没有值，viewModel对象的集合属性都是空的，我的代码是错的

如何在我的操作方法上获取模型对象值（集合），以便我可以将该值保存或更新回我的数据库

Answer 1

您需要将foreach更改for循环，以便控件正确命名并且可以由DefaultModelBinder绑定

 @for (int i = 0; i < Model.ReleasingTheaters.Count; i++) { @Html.TextBoxFor(m => m.ReleasingTheaters[i].DateFrom) .... } 

这将生成诸如的输入

另请注意，您不应该使用new { id = "DateFrom" }等设置id属性。帮助器将呈现唯一的ID，但您创建的重复ID是无效的html