发布到列表<modeltype>MVC3 [英] Posting to a list&lt;modeltype&gt; MVC3

问题描述

我试图让我的视图将列表发布回操作，但它一直以空值出现.

I am trying to get my view to post a List back to the action however it keeps coming in as null.

所以我的模型有一个 WeightEntry 对象列表.

So my Model has a List of WeightEntry objects.

练习模型

public class Exercise
{
    public List<WeightEntry> Entries { get; set; }
    public int ExerciseID { get; set; }
    public int ExerciseName { get; set; }
}

权重输入模型

public class WeightEntry
{
    public int ID { get; set; }
    public int Weight { get; set; }
    public int Repetition { get; set; }
}

我的视图包含运动名称和一个 WeightEntry 对象的循环

My View contains the ExerciseName and a forloop of WeightEntry objects

@model Mymvc.ViewModels.Exercise
...
<span>@Model.ExerciseName</span>
@using (Html.BeginForm())
{
    @Html.ValidationSummary(true)
    <table class="left weight-record">
        <tr>
            <th>Reps</th>
            <th>Weight</th>
        </tr>
        @foreach (var item in Model.Entries)
        {
            <tr>
                <td>
                    @Html.EditorFor(x => item.Repetition)
                </td>
                <td>
                    @Html.EditorFor(x => item.Weight)
                </td>
            </tr>
        }
    </table>
    <input type="submit" value="Save" /> 
}

Controller Action (Post) 目前什么都不做.我只是想在添加保存代码之前让绑定工作.

The Controller Action (Post) Does nothing at the moment. I am just trying to get the binding working before I add the save code.

[HttpPost]
public ActionResult WeightEntry(Exercise exercise)
{
    try
    {
        //Add code here to save and check isvalid    
        return View(exercise);
    }
    catch
    {
        return View(exercise);
    }
}

我看到了一些向 MVC2 中使用的表单元素名称添加分子的小技巧，但我想知道 MVC3 是否有什么不同?我希望它能够很好地绑定 ID 为 0 或 null，但是当我在表单发布后检查它时，整个 List 为 null.任何帮助表示赞赏.谢谢.

I have seen a few little tricks with adding a numerator to the form elements' names used in MVC2 but I was wondering if MVC3 was any different? I was hoping it would all bind nicely with ID's being 0 or null but instead the whole List is null when I inspect it after the form posts. Any help is appreciated. Thanks.

推荐答案

替换如下循环:

@foreach (var item in Model.Entries)
{
    <tr>
        <td>
            @Html.EditorFor(x => item.Repetition)
         </td>
         <td>
             @Html.EditorFor(x => item.Weight)
         </td>
     </tr>
}

与:

@for (var i = 0; i < Model.Entries.Count; i++)
{
    <tr>
        <td>
            @Html.EditorFor(x => x.Entries[i].Repetition)
         </td>
         <td>
             @Html.EditorFor(x => x.Entries[i].Weight)
         </td>
     </tr>
}

或者更好的是，使用编辑器模板并将循环替换为:

or even better, use editor templates and replace the loop with:

@Html.EditorFor(x => x.Entries)

然后定义一个自定义编辑器模板，该模板将自动为 Entries 集合的每个元素呈现(~/Views/Shared/EditorTemplates/WeightEntry.cshtml):

and then define a custom editor template that will automatically be rendered for each element of the Entries collection (~/Views/Shared/EditorTemplates/WeightEntry.cshtml):

@model WeightEntry
<tr>
    <td>
        @Html.EditorFor(x => x.Repetition)
     </td>
     <td>
         @Html.EditorFor(x => x.Weight)
     </td>
 </tr>

生成的输入元素将具有正确的名称，您将能够成功在您的 POST 操作中取回它们.

The the generated input elements will have correct names and you will be able to successfully fetch them back in your POST action.

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