Question

我的问题是将模型返回给控制器... 我有一个烹饪食谱网站。和两个模型

public class FeedBackListViewModel
{      
    public int  FeedBackID { get; set; }
    public string FoodName{ get; set; }
    public List<StepModel> Steps { get; set; }
}

public class Food 
{    
     public int ID {get;set;}
     public string FoodName { get; set; } 
     public string Time { get; set; }
     public List<StepModel> Steps { get; set; }
 }

public class StepModel 
{    
     public int StepID {get;set;}
     public int StepNo { get; set; } 
     public string StepDetail { get; set; }
     public bool Achived { get; set; }
}

public IActionResult Edit(int id)
{
   // Imagine i have got a Food[0].Steps{Step1, Step2, Step 3}
       each food has different number of Steps.
    return View(Food[0]);
}

cshmtl文件...我简化了代码以便于阅读

 @model FeedBackListViewModel

 <form asp-action="Edit">
    <input asp-for="FoodName " class="form-control" />
    @foreach (var item in Model.Steps)
          {
       <tr>
           <td>@Html.DisplayFor(model => item.StepID)</td>
           <td>@item.StepNo</td>
            <td>
            <input type="text" id="@item" value="@item.StepDetail" />
                    </td>
                    <td><select asp-for="@item.Achivmed">
                           <option value = yes> Yes </option>
                           <option value = No> No </option>
                        </select> 
                    </td>                        
        </tr   >
            }



[HttpPost]
public IActionResult Edit(FeedBackListViewModel viewModel)
{
    // I got my foodName detail correct but Steps are always null. 
    // I can't retrieve changes on steps. 

    return View();
}

Answer 1

请尝试以下。我认为Steps初始化时未初始化FeedBackListViewModel。公共类FeedBackListViewModel {
public int FeedBackID {get;组; } 公共字符串FoodName {get;组; } 公开列表步骤{get;组; }

   public FeedBackListViewModel()
   {
      Steps = new List<StepModel>(); 
   }
}

Answer 2

首先，我看不到将数据注入到集合中的代码。

public class FeedBackListViewModel
{      
    public int FeedBackID { get; set; }
    public string FoodName{ get; set; }
    public List<StepModel> Steps { get; set; } = new List<StepModel>();

}

还有，这里有错字

<select asp-for="@item.Achivmed">

再试一次！

将复杂的模型从视图传递到控制器

2 个答案: