我正在使用MVC 4,我想摆脱编辑页面,只是在索引页面上同时进行多项改变。
以下是CSHTML:
@model IEnumerable<HelpDesk.Models.ViewPerm>
@{
ViewBag.Title = "Index";
}
<h2>Index</h2>
<p>
@Html.ActionLink("Create New", "Create")
</p>
@using (Html.BeginForm())
{
@Html.ValidationSummary(true)
<fieldset>
<legend>ViewPerm</legend>
<table style="border: 5px solid white;">
<tr>
<th style="border: 5px solid white;">
@Html.DisplayNameFor(model => model.Roles.Role)
</th>
<th style="border: 5px solid white;">
@Html.DisplayNameFor(model => model.Views.Page)
</th>
<th style="border: 5px solid white;">
@Html.DisplayNameFor(model => model.Perm)
</th>
<th></th>
</tr>
@foreach (var item in Model)
{
<tr>
<td style="border: 5px solid white;">
@Html.DisplayFor(modelItem => item.Roles.Role)
</td>
<td style="border: 5px solid white;">
@Html.DisplayFor(modelItem => item.Views.Folder)
@Html.DisplayFor(modelItem => item.Views.Page)
</td>
<td style="border: 5px solid white;">
@Html.EditorFor(modelItem => item.Perm)
</td>
<td>
@Html.ActionLink("Delete", "Delete", new { id = item.VPermID })
</td>
</tr>
}
</table>
<input type="submit" value="Save" />
</fieldset>
}
@section Scripts {
@Scripts.Render("~/bundles/jqueryval")
}
和C#:
public ActionResult Index()
{
var viewperm = db.ViewPerm.Include(v => v.Roles).Include(v => v.Views);
return View(viewperm.ToList());
}
[HttpPost]
public ActionResult Index(ViewPerm viewperm)
{
if (ModelState.IsValid)
{
db.Entry(viewperm).State = EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
}
return View(viewperm);
}
当我点击保存按钮时,它显示“存储更新,插入或删除语句影响了意外的行数(0)。实体可能已被修改或删除,因为实体已加载。刷新ObjectStateManager条目。”
感谢您的帮助。
答案 0 :(得分:2)
第一个问题:您的观点涉及多个 ViewPerm
,但您的帖子操作只需一个。
更改帖子方法以处理多个:
[HttpPost]
public ActionResult Index(IEnumerable<ViewPerm> viewperms)
{
if (ModelState.IsValid)
{
foreach (ViewPerm viewperm in viewperms)
{
db.Entry(viewperm).State = EntityState.Modified;
}
db.SaveChanges();
}
return View(viewperms);
}
您的第二个问题是,您正在使用foreach
在视图中迭代模型中的项目。这些字段需要正确编制索引,以便模型绑定器可以完成它(它适用于数组)。将您的观点更改为:
@for (int i = 0; i < Model.Count(); i++)
{
<tr>
<td style="border: 5px solid white;">
@Html.DisplayFor(m => m[i].Roles.Role)
</td>
<td style="border: 5px solid white;">
@Html.DisplayFor(m => m[i].Views.Folder)
@Html.DisplayFor(m => m[i].Views.Page)
</td>
<td style="border: 5px solid white;">
@Html.EditorFor(m => m[i].Perm)
</td>
<td>
@Html.ActionLink("Delete", "Delete", new { id = Model[i].VPermID })
</td>
</tr>
}