Question

我有家庭控制器动作，如：

 public ActionResult Index()
 {
   ViewBag.Message = "Modify this template to jump-start your ASP.NET MVC application.";
   List<SelectListItem> oList = new List<SelectListItem>();
   oList.Add(new SelectListItem() { Text = "Rest1", Value = "1" });
   oList.Add(new SelectListItem() { Text = "Rest2", Value = "2", Selected=true});
   oList.Add(new SelectListItem() { Text = "Rest3", Value = "3" });
   Person p = new Person() { PossibleSchools = oList };
   return View(p);
 }

在提交按钮单击时调用的另一个是::

    public void ModelBinding(Person p)
    {
        var name = p.Name;
    }

在视图中我有以下代码::

<div class="content-wrapper">
<hgroup class="title">
    <h1>@ViewBag.Title.</h1>
    <h2>@ViewBag.Message</h2>
</hgroup>
<form action="Home/ModelBinding" method="post">
    <p>
  Name :: <input type="text" name="Name"/>
  Restaurant :: @Html.DropDownList("PossibleSchools");
        <input type="submit" />
</p>
</form>    
</div>

我的模特是::

public class Person
{
    public string Name { get; set; }
    public List<SelectListItem> PossibleSchools { get; set; }
}

问题在于，每当我尝试调试此应用程序时，我都会看到Name字段已绑定但PossibleSchools计数为零。

因此dropdownlist没有受到约束。

Answer 1

在第一行视图中使用以下代码：

@model Person
<div class="content-wrapper">
<hgroup class="title">
    <h1>@ViewBag.Title.</h1>
    <h2>@ViewBag.Message</h2>
</hgroup>
<form action="Home/ModelBinding" method="post">
    <p>
  Name :: <input type="text" name="Name"/>
  Restaurant :: @Html.DropDownListFor(model => model.Name, Model.PossibleSchools)
        <input type="submit" />
</p>
</form>    
</div>

Answer 2

这是一个可能有帮助的重构版本：

在您的控制器中：

public ActionResult Index()
{
    ViewBag.Message = "Modify this template to jump-start your ASP.NET MVC application.";   
    Person p = new Person();
    return View(p);
}

public void ModelBinding(Person p)
{
    // Perform action to process the request
}

你的模特：

public class Person
{
    public string Name { get; set; }
    public string SchoolName { get; set; }
    public List<SelectListItem> PossibleSchools 
    { 
        get
        {
            return new List<SelectListItem>()
                {
                    new SelectListItem() { Text = "Rest1", Value = "1" }),
                    new SelectListItem() { Text = "Rest2", Value = "2" }),
                    new SelectListItem() { Text = "Rest3", Value = "3" })
                };
        }
    }
}

最后在你看来：

@model Person
<div class="content-wrapper">
<hgroup class="title">
    <h1>@ViewBag.Title.</h1>
    <h2>@ViewBag.Message</h2>
</hgroup>
<form action="Home/ModelBinding" method="post">
    <p>
  Name :: @Html.TextBoxFor(m => m.Name)
  Restaurant :: @Html.DropDownListFor(model => model.SchoolName, Model.PossibleSchools)
    <input type="submit" />
</p>
</form>    
</div>

希望这有帮助。

如何在mvc4中进行dropdownlist绑定

2 个答案: