数据没有受到行动方法的约束

时间:2011-09-07 11:15:28

标签: c# asp.net-mvc asp.net-mvc-3

我正在使用pubs数据库,基本上我在一个页面上显示作者列表,并且有编辑链接。点击编辑链接后,会显示一个页面,其中包含作者的信息,复选框除了特定作者所写的标题外,还有复选标记。

这是我的代码,直到现在:

HomeController的动作方法:

public ActionResult Edit(string id)
{
    author author = db.authors.Include("titleauthors").Where(a => a.au_id == id).Single();

    List<TitleViewModel> titleViewModelList = db.titles.Select<title, TitleViewModel>(title =>
        new TitleViewModel { IsChecked = false, Title = title.title1, title_id = title.title_id }).ToList();

    foreach (var item in author.titleauthors)
    {
        TitleViewModel titleViewModel = titleViewModelList.Where(model => model.title_id == item.title_id).SingleOrDefault();
        if (titleViewModel != null)
            titleViewModel.IsChecked = true;
    }

    AuthorViewModel AuthorViewModel = new AuthorViewModel
    {
        Author = author,
        TitleViewModels = titleViewModelList
    };

    return View(AuthorViewModel);
}

[HttpPost]
public ActionResult Edit(AuthorViewModel AuthorViewModel)
{

    return RedirectToAction("Index");
}

Edit.cshtml:

@model MVCCheckboxList.ViewModels.AuthorViewModel
@{
    ViewBag.Title = "Edit";
    Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>
    Edit</h2>
<fieldset>
    @using (Html.BeginForm())
    {
        <legend>Edit author</legend>
        <table>
            <tr>
                <td>
                    @Html.LabelFor(model => model.Author.au_fname)
                </td>
                <td>
                    @Html.TextBoxFor(model => model.Author.au_fname)
                </td>
            </tr>
            <tr>
                <td>
                    @Html.LabelFor(model => model.Author.au_lname)
                </td>
                <td>
                    @Html.TextBoxFor(model => model.Author.au_lname)
                </td>
            </tr>
            <tr>
                <td>
                    @Html.LabelFor(model => model.Author.address)
                </td>
                <td>
                    @Html.TextBoxFor(model => model.Author.address)
                </td>
            </tr>
            <tr>
                <td valign="top">
                    Titles
                </td>
                <td>
                    @Html.EditorFor(model => model.TitleViewModels, "TitleViewModels")
                </td>
            </tr>
            <tr>
                <td>
                    <p>
                        <input type="submit" value="Save" />
                    </p>
                </td>
            </tr>
        </table>
    }
</fieldset>

这是我的AuthorViewModel:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace MVCCheckboxList.ViewModels
{
    public class AuthorViewModel
    {
        public List<TitleViewModel> TitleViewModels { get; set; }
        public author Author { get; set; }
    }
}

这是我的TitleViewModel:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace MVCCheckboxList.ViewModels
{
    public class TitleViewModel
    {
        public string title_id { get; set; }
        public bool IsChecked { get; set; }
        public string Title { get; set; }
    }
}

信息在“编辑”页面中正确显示。但是当我点击提交时,AuthorViewModel中的Author属性正确保存了所有数据,但List<TitleViewModel>中的AuthorViewModel为空。任何人都可以发现这个错误的原因吗?

这是我的EditorTemplate(TitleViewModels.cshtml):

@model IEnumerable<MVCCheckboxList.ViewModels.TitleViewModel>
<table>

@foreach (var item in Model) {
    <tr>
        <td>
            @Html.HiddenFor(modelItem => item.title_id)
        </td>
        <td>
            @Html.CheckBoxFor(modelItem => item.IsChecked)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.Title)
        </td>
    </tr>
}

</table>

1 个答案:

答案 0 :(得分:2)

Here您可以找到有关列表绑定的更多信息。

只需将EditorTemplate的名称更改为TitleViewModel.cshtml并粘贴该代码:

@model MVCCheckboxList.ViewModels.TitleViewModel

<td>
    @Html.HiddenFor(modelItem => Model.title_id)
</td>
<td>
    @Html.CheckBoxFor(modelItem => Model.IsChecked)
</td>
<td>
    @Html.DisplayFor(modelItem => Model.Title)
</td>

Edit.cshtml中使用以下代码为列表中的每个元素生成编辑器

<table>
@for (int i = 0; i < Model.TitleViewModels.Count; i++) {
    @Html.EditorFor(m => Model.TitleViewModels[i])
}
</table>