从传递到一个局部视图嵌套复杂对象获取的值 [英] getting the values from a nested complex object that is passed to a partial view

问题描述

我有了一个复杂的对象作为其成员之一的视图模型。复杂的对象有4个属性（所有字符串）。我试图创建一个可重复使用的部分观点，我可以在复杂的对象传递，并将它生成HTML辅助其属性的HTML。这是所有伟大的工作。然而，当我提交表单，模型绑定不映射值回视图模型的成员，所以我没有得到任何东西在服务器端。我怎样才能读取的值用户键入到H​​TML佣工对于复杂的对象。

I have a ViewModel that has a complex object as one of its members. The complex object has 4 properties (all strings). I'm trying to create a re-usable partial view where I can pass in the complex object and have it generate the html with html helpers for its properties. That's all working great. However, when I submit the form, the model binder isn't mapping the values back to the ViewModel's member so I don't get anything back on the server side. How can I read the values a user types into the html helpers for the complex object.

视图模型

public class MyViewModel
{
     public string SomeProperty { get; set; }
     public MyComplexModel ComplexModel { get; set; }
}

MyComplexModel

MyComplexModel

public class MyComplexModel
{
     public int id { get; set; }
     public string Name { get; set; }
     public string Address { get; set; }
     ....
}

控制器

public class MyController : Controller
{
     public ActionResult Index()
     {
          MyViewModel model = new MyViewModel();
          model.ComplexModel = new MyComplexModel();
          model.ComplexModel.id = 15;
          return View(model);
     }

     [HttpPost]
     public ActionResult Index(MyViewModel model)
     {
          // model here never has my nested model populated in the partial view
          return View(model);
     }
}

查看

@using(Html.BeginForm("Index", "MyController", FormMethod.Post))
{
     ....
     @Html.Partial("MyPartialView", Model.ComplexModel)
}

管窥

@model my.path.to.namespace.MyComplexModel
@Html.TextBoxFor(m => m.Name)
...

我怎么可以绑定表单提交该数据，以便父模型中包含数据的Web表单上从局部视图中输入？

how can I bind this data on form submission so that the parent model contains the data entered on the web form from the partial view?

感谢

编辑：我想通了，我需要prePENDComplexModel。我所有的控制在局部视图（文本框），因此它映射到嵌套的对象，但我不能视图模型类型传递到局部视图，以获得额外的层，因为它需要是通用接受几个视图模型名称类型。我可以只重写与JavaScript的name属性，但似乎过于贫民窟给我。我还能怎么办呢？

I've figured out that I need to prepend "ComplexModel." to all of my control's names in the partial view (textboxes) so that it maps to the nested object, but I can't pass the ViewModel type to the partial view to get that extra layer because it needs to be generic to accept several ViewModel types. I could just rewrite the name attribute with javascript, but that seems overly ghetto to me. How else can I do this?

编辑2：我可以静态设置新的{名称=ComplexModel.Name} name属性，所以我觉得我的业务，​​除非有人有更好的方法

EDIT 2: I can statically set the name attribute with new { Name="ComplexModel.Name" } so I think I'm in business unless someone has a better method?

推荐答案

您可以通过preFIX到部分使用

You can pass the prefix to the partial using

@Html.Partial("MyPartialView", Model.ComplexModel, 
    new ViewDataDictionary { TemplateInfo = new TemplateInfo { HtmlFieldPrefix = "ComplexModel" }})

这将perpend的preFIX你的控件名称属性，这样＆LT;输入名称=名称../> 将成为＆LT;输入名称=ComplexModel.Name../& GT; 并正确绑定到的typeof MyViewModel 上回发

which will perpend the prefix to you controls name attribute so that <input name="Name" ../> will become <input name="ComplexModel.Name" ../> and correctly bind to typeof MyViewModel on post back

修改

要使它更容易一些，你可以在一个HTML辅助封装这一

To make it a little easier, you can encapsulate this in a html helper

public static MvcHtmlString PartialFor<TModel, TProperty>(this HtmlHelper<TModel> helper, Expression<Func<TModel, TProperty>> expression, string partialViewName)
{
  string name = ExpressionHelper.GetExpressionText(expression);
  object model = ModelMetadata.FromLambdaExpression(expression, helper.ViewData).Model;
  var viewData = new ViewDataDictionary(helper.ViewData)
  {
    TemplateInfo = new System.Web.Mvc.TemplateInfo { HtmlFieldPrefix = name }
  };
  return helper.Partial(partialViewName, model, viewData);
}

和使用它作为

@Html.PartialFor(m => m.ComplexModel, "MyPartialView")

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