ASP.Net MVC - 模型集合不填充在回发 [英] ASP.Net MVC - model with collection not populating on postback

问题描述

我有一个模型，它是深含集合几层一个ASP.Net MVC应用程序。

I have an ASP.Net MVC application with a model which is several layers deep containing a collection.

我认为，要创建对象的视图所有设置正确，但它只是没有在模型中填充集合时，我发帖的形式向服务器。

I believe that the view to create the objects is all set up correctly, but it just does not populate the collection within the model when I post the form to the server.

我有一个数据是在类层次结构中发现这样的：

I have a piece of data which is found in the class hierarchy thus:

person.PersonDetails.ContactInformation[0].Data;

本类结构由LinqToSQL创建，ContactInformation类型为的EntitySet＆LT;＆联络资料GT; 。要创建我通过查看以下内容：

This class structure is created by LinqToSQL, and ContactInformation is of type EntitySet<ContactData>. To create the view I pass the following:

return View(person);

和在视图中我有一​​个包含关联到上述领域的一个名字一个文本框形式：

and within the view I have a form which contains a single text box with a name associated to the above mentioned field:

<%= Html.TextBox("person.PersonDetails.ContactInformation[0].Data")%>

我的控制器中的POST方法则如下：

The post method within my controller is then as follows:

[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Create (Person person)
{
  //Do stuff to validate and add to the database 
}

正是在这一点上，我担心迷路person.PersonDetails.ContactInformation.Count（）== 0。所以ModelBinder的创造了ContactInformation对象，但没有与它应该在索引0保持（即联络资料）对象填充它。

It is at this point where I get lost as person.PersonDetails.ContactInformation.Count() ==0. So the ModelBinder has created a ContactInformation object but not populated it with the object which it should hold (i.e ContactData) at index 0.

我的问题是双重的：
1.我是否采取了正确的方法..即应这项工作？
2.任何想法，为什么它可能未填充ContactInformation对象？

My question is two fold: 1. Have I taken the correct approach.. i.e. should this work? 2. Any ideas as to why it might be failing to populate the ContactInformation object?

非常感谢，
理查德

Many thanks, Richard

推荐答案

我认为你的模型过于复杂，默认的模型绑定一起工作。你可以尝试使用多个参数和prefixes结合他们：

I think that your model is too complex for the default model binder to work with. You could try using multiple parameters and binding them with prefixes:

public ActionResult Create( 
    Person person,
    [Bind(Prefix="Person.PersonDetails")]
    PersonDetails details,
    [Bind(Prefix="Person.PersonDetails.ContactInformation")] 
    ContactInformation[] info )
{
      person.PersonDetails = details;
      person.PersonDetails.ContactInformation = info;

      ...
}

或者你也可以开发自己的定制模型绑定，将了解如何从表单输入派生复杂的模型。

Or you could develop your own custom model binder that would understand how to derive your complex model from the form inputs.

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