Question

好的我经过几个小时的故障排除后放弃了，但我相信你们都会马上看到解决方案。我有三个模型Person，Course和CoursePreference。 CoursePreference模型有两个外键PersonId和CourseId。

我想做什么：我想创建一个视图，用户可以在顶部的Create部分中添加课程首选项，当他们单击Add时，表单将在同一视图中发布和刷新List。基本上我在一个视图中组合索引和创建。所以我在CoursePreference文件夹中创建了一个Index View和一个名为_CreatePartial的局部视图。

问题：视图显示正常，但有两个问题。 1）CoursePreferenceId字段显示下拉列表。我希望它是一个隐藏的领域，因为它是一个身份。我完全从脚手架的Create View中复制了代码，它正确地隐藏了Id。不知道为什么它不能在_CreatePartial视图中工作？ 2）最重要的是，我的_CreatePartial不会添加任何课程偏好。看起来好像表单正在发布但没有添加记录。

是什么给出了？

以下是模型，控制器和视图：

---------------------------
Models (stripped down versions)
---------------------------


public class CoursePreference
{
public int CoursePreferenceId { get; set; }
public Nullable<int> CourseId { get; set; }
public Nullable<int> PersonId { get; set; }
public virtual Course Course { get; set; }
public virtual Person Person { get; set; }
}

public class Person
{
public int PersonId { get; set; }
public string LastName { get; set; }
public string FirstName { get; set; }
public virtual ICollection<CoursePreference> CoursePreferences { get; set; }    
}

public class Course
{
public int CourseId { get; set; }
public Nullable<int> ProgramId { get; set; }
public string Name { get; set; }
public virtual ICollection<CoursePreference> CoursePreferences { get; set; }
}

------------------
Controllers
------------------

public ActionResult _CreatePartial()
{
ViewBag.CourseId = new SelectList(db.Courses, "CourseId", "Name");
ViewBag.PersonId = new SelectList(db.People, "PersonId", "LastName");
return View("_CreatePartial");
}

public ActionResult Index()
{
ViewBag.CourseId = new SelectList(db.Courses, "CourseId", "Name");
ViewBag.PersonId = new SelectList(db.People, "PersonId", "LastName");
var coursepreferences = db.CoursePreferences.Include(c => c.Course).Include(c => c.Person);
return View(coursepreferences.ToList());
}

---------------------------
Index View
---------------------------

@model IEnumerable<MyProj.Models.CoursePreference>

@{  ViewBag.Title = "Index";
}

<h4>Add Course Preferences</h4>

<div>
@Html.Partial("~/Views/CoursePreference/_CreatePartial.cshtml", new MyProj.Models.CoursePreference())
</div>
<br />
<table class="table">
<tr>
<th>
@Html.DisplayNameFor(model => model.Course.Name)
</th>
<th>
@Html.DisplayNameFor(model => model.Person.LastName)
</th>
<th></th>
</tr>

@foreach (var item in Model) {
<tr>
<td>
@Html.DisplayFor(modelItem => item.Course.Name)
</td>
<td>
@Html.DisplayFor(modelItem => item.Person.LastName)
</td>
<td>
@Html.ActionLink("Edit", "Edit", new { id=item.CoursePreferenceId }) |
@Html.ActionLink("Details", "Details", new { id=item.CoursePreferenceId }) |
@Html.ActionLink("Delete", "Delete", new { id=item.CoursePreferenceId })
</td>
</tr>
}

</table>
---------------------------
_CreatePartial View
---------------------------

@model MyProj.Models.CoursePreference

@using (Html.BeginForm())
{
@Html.AntiForgeryToken()

<div class="form-horizontal">
<h4>CoursePreference</h4>
<hr />
@Html.ValidationSummary(true)

<div class="form-group">
@Html.LabelFor(model => model.CoursePreferenceId, new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.CoursePreferenceId)
@Html.ValidationMessageFor(model => model.CoursePreferenceId)
</div>
</div>

<div class="form-group">
@Html.LabelFor(model => model.CourseId, "CourseId", new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.DropDownList("CourseId", String.Empty)
@Html.ValidationMessageFor(model => model.CourseId)
</div>
</div>

<div class="form-group">
@Html.LabelFor(model => model.PersonId, "PersonId", new { @class = "control-label col-md-2" }
<div class="col-md-10">
@Html.DropDownList("PersonId", String.Empty)
@Html.ValidationMessageFor(model => model.PersonId)
</div>
</div>

<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Create" class="btn btn-default" />
</div>
</div>
</div>

Answer 1

由于您没有控制器方法来处理帖子，因此无法保存任何内容。在您的控制器中实现：

[HttpPost]
public ActionResult Index(CoursePreference pref)
{
    // Insert code to fetch database context into variable "db"
    db.CoursePreferences.Add(pref);
    db.SaveChanges();
    return RedirectToAction("Index");
}

对于隐藏的ID字段，您应该使用：

@Html.HiddenFor(model => model.CoursePreferenceId)

-not EditorFor或LabelFor。

使用局部视图在同一视图中创建和索引

1 个答案: