Question

我注意到我的viewmodel属性被回发为null。经过进一步调查，发现问题是文本框的名称属性（通过TextBoxFor帮助方法生成的文本框）缺少动作的viewmodel变量参数名称。

也许示例代码会更清晰 -

视图模型

public class ViewModel {
    public string ID {get;set;}
    public List<ViewModelChild> ViewCustomNames{ get; set; }
}

控制器操作（ViewModel包含集合属性ViewCustomNames）

public ActionResult Create(ViewModel viewModel1) {...}

查看（使用ViewModel强力输入）

@Html.TextBoxFor(vc => vc.ID) //This will not be posted back
<input name="viewModel1.ID" type="text" /> //This will be posted back
@for(int i = 0; I < Model.ViewCustomNames.Count;i++)
    @Html.TextBoxFor(m => m.ViewCustomNames[i].SomeProperty)

生成的HTML

<input name="ID"...
<input name="ViewCustomNames[0].SomeProperty" id="ViewCustomNames_0_SomeProperty" type="text" value="">

生成的HTML应该是什么

<input name="viewModel1.ID"...
<input name="viewModel1.ViewCustomNames[0].SomeProperty" id="doesn't-matter-for-this-example" type="text" value="">

问题我通过用明确的HTML输入元素替换TextBoxFor（...）来修复它，但我想知道它是否是MVC5错误或者我是否遗漏了明显的东西。我无法想象ASP.NET附带的标准TextBoxFor方法不起作用，它必须是我做错的事情。有什么想法吗？

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添加我项目中使用的实际代码以供参考 -

控制器*

public class ViewCustomViewModelsController : Controller {
[HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Create([Bind(Include = "ViewCustomId,ViewCustomName,ReconContextId,ViewCustomFieldCollection")] ViewCustomViewModel viewCustomViewModel) { }

}

查看

@model AR.UI.MVC.ViewModels.ViewCustomViewModel
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()

<div class="form-horizontal">
    <h4>ViewCustomViewModel</h4>
    <hr />
    @Html.ValidationSummary(true, "", new { @class = "text-danger" })
    @Html.HiddenFor(model => model.ViewCustomId)

    <div class="form-group">
        <dl class="dl-horizontal">
            <dt>ViewCustomId</dt>
            <dd>@*@Html.TextBoxFor(vc => vc.ViewCustomId)*@ //Posts back null
                <input name="viewCustomViewModel.ViewCustomId" type="text" value="@Model.ViewCustomId" /> //Posts back the correct value
            </dd>
            <dt>Name</dt>
            <dd>@Html.TextBoxFor(vc => vc.ViewCustomName) //Posts back null
            <input name="viewCustomViewModel.ViewCustomName" type="text" value="@Model.ViewCustomName" /> //Posts back the correct value
            </dd>
            <dt>ReconContext</dt>
            <dd>@Html.DropDownList("viewCustomViewModel.ReconContextId", ViewBag.ReconContextList as SelectList)</dd>
        </dl>
        <span>Field</span>
        @Html.DropDownList("Field", new SelectList(ViewBag.FieldList, "FieldId", "FieldName"), new { id = "ddlField" })
        <a href="javascript:void(0)" onclick="AddField($('#ddlField').val(), $('#ddlField :selected').text());return false;">Add</a>
        <table id="tableSelectedFields">
            <tr><th>Id</th><th>FieldId</th><th>FieldName</th><th>DisplayOrder</th><th>SortOrder</th><th></th></tr>
            @for (int fieldCount = 0; fieldCount < Model.ViewCustomFieldCollection.Count; fieldCount++)
            {
                <tr>
                    <td><input name="viewCustomViewModel.ViewCustomFieldCollection.Index" type="text" value="@fieldCount" /></td>
                    <td><input name="viewCustomViewModel.ViewCustomFieldCollection[@fieldCount].ViewCustomFieldId" type="text" value="@Model.ViewCustomFieldCollection[@fieldCount].ViewCustomFieldId" /> </td>
                    <td><input name="viewCustomViewModel.ViewCustomFieldCollection[@fieldCount].FieldId" type="text" value="@Model.ViewCustomFieldCollection[@fieldCount].FieldId" /> </td>

视图模型

namespace AR.UI.MVC.ViewModels
{
public class ViewCustomViewModel
{
    [Key]
    public int ViewCustomId { get; set; }
    public string ViewCustomName { get; set; }
    public int ReconContextId { get; set; }
    public int ReconContextName { get; set; }
    public List<ViewCustomFieldViewModel> ViewCustomFieldCollection { get; set; }
    public ViewCustomViewModel() { ViewCustomFieldCollection = new List<ViewCustomFieldViewModel>(); }
    public ViewCustomViewModel(int viewCustomId, string viewCustomName)
    {
        ViewCustomId = viewCustomId;
        ViewCustomName = viewCustomName;
        ViewCustomFieldCollection = new List<ViewCustomFieldViewModel>();
    }
}

public class ViewCustomFieldViewModel
{
    [Key]
    public int ViewCustomFieldId { get; set; }
    public int ViewCustomId { get; set; }
    public int FieldId { get; set; }
    public string FieldName { get; set; }
    public int DisplayOrder { get; set; }
    public int SortOrder { get; set; }
    public ViewCustomFieldViewModel() { }
    public ViewCustomFieldViewModel(int viewCustomFieldId, int viewCustomId, int fieldId, string fieldName, int displayOrder, int sortOrder)
    {
        ViewCustomFieldId = viewCustomFieldId;
        ViewCustomId = viewCustomId;
        FieldId = fieldId;
        FieldName = fieldName;
        DisplayOrder = displayOrder;
        SortOrder = sortOrder;
    }
}

TextBoxFor没有为ASP.NET MVC5中的输入元素创建正确的name属性？

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0 个答案: