asp.net-mvc 使用模型绑定从 MVC 4 中的 List<T> 中选择项目
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Select Items from List<T> in MVC 4 using Model Binding
提问by Eric J.
Given a class
给定一个班级
public class Person
{
// Some general properties
public List<Hobby> Hobbies { get; set; }
}
public class Hobby
{
// Some properties e.g. Name, etc.
}
static List<Hobby> AllHobbies { get; }
Is it possible to create a view that allows the user to select his hobbies using model binding?
是否可以创建一个允许用户使用模型绑定选择他的爱好的视图？
It would certainly be possible in the view to loop through AllHobbiesand render an <input type="checkbox" />for each, then wire up the selected values by hand in the postback controller. It seems that this should be doable with model binding, but I don't see how.
在视图中当然可以循环AllHobbies并<input type="checkbox" />为每个渲染一个，然后在回发控制器中手动连接选定的值。似乎这应该可以通过模型绑定来实现，但我不知道怎么做。
回答by Darin Dimitrov
Sure, I would recommend you using editor templates.
当然，我建议您使用编辑器模板。
Let's suppose that a hobby has a name and a boolean field indicating whether it was selected by the user:
让我们假设一个爱好有一个名称和一个布尔字段，指示它是否被用户选择：
public class Hobby
{
public string Name { get; set; }
public bool Selected { get; set; }
}
then a controller to feed the model into the view and process the form submission:
然后是一个控制器，将模型输入视图并处理表单提交：
public class HomeController : Controller
{
public ActionResult Index()
{
var person = new Person
{
Hobbies = new[]
{
new Hobby { Name = "hobby 1" },
new Hobby { Name = "hobby 2", Selected = true },
new Hobby { Name = "hobby 3" },
}.ToList()
};
return View(person);
}
[HttpPost]
public ActionResult Index(Person person)
{
var selectedHobbies = person
.Hobbies
.Where(x => x.Selected).Select(x => x.Name);
string message = string.Join(",", selectedHobbies);
return Content("Thank you for selecting: " + message);
}
}
then a view containing the form allowing the user to select hobbies:
然后是一个包含允许用户选择爱好的表单的视图：
@model Person
@using (Html.BeginForm())
{
<h2>Hobbies</h2>
@Html.EditorFor(x => x.Hobbies)
<button type="submit">OK</button>
}
and a corresponding editor template which will automatically be rendered for each element of the Hobbiescollection (~/Views/Home/EditorTemplates/Hobby.cshtml-> notice that the name and location of the template is important):
以及一个相应的编辑器模板，它将为Hobbies集合的每个元素自动呈现（~/Views/Home/EditorTemplates/Hobby.cshtml-> 注意模板的名称和位置很重要）：
@model Hobby
<div>
@Html.LabelFor(x => x.Selected, Model.Name)
@Html.HiddenFor(x => x.Name)
@Html.CheckBoxFor(x => x.Selected)
</div>
For more advanced editing scenarios I would recommend you going through the Steven Sanderson's blog poston this topic.
对于更高级的编辑场景，我建议您阅读 Steven Sanderson关于此主题的博客文章。
