将复杂对象绑定到MVC控制器

Question

I'm creating an mvc4 application and i have an issue.

I have a model class for example:

 public class ModelClass
{
   public ClassA a {get; set;}
   public ClassB b {get; set;}
   public ClassC c {get; set;}
   ...
}

Each of thease classes have their own properties, for example:

public class ClassA
{
   public String a1 {get; set;}
   public String a2 {get; set;}
   ...
}

 public class ClassB
{
   public String b1 {get; set;}
   public String b2 {get; set;}
   ...
}

...

I have a view like this:

<input type="text" name="a1" id="a1" />
<input type="text" name="a2" id="a1" />
<input type="text" name="b1" id="a1" />
<input type="text" name="b2" id="a1" />
...

How should my controller or view look so I can bind ModelClass to Controller?

 [HttpPost]
    public ActionResult CreateSomething(ModelClass model)
    {
       //insert code here
    }

Or I have to do a custom model binding?

Answer 1

There's nothing you need to do in your controller. You simply need to name your inputs properly. Based on your structure. Your fields should look like:

<input type="text" name="a.a1" />
<input type="text" name="a.a2" />
<input type="text" name="b.b1" />
<input type="text" name="b.b2" />

It's preferable to just use the HTML helpers as they'll always generate the right names for you. For example:

@Html.TextBoxFor(m => m.a.a1)

Answer 2

There might be some neat solutions out there, but if things get too complicated, you can always fall back on FormCollection . Your code would then look something like this;

[HttpPost]
public ActionResult CreateSomething(FormCollection collection)
{
    var model = new ModelClass();
    model.a = new ClassA();
    model.a.a1 = collection["a1"].ToString();
    model.a.a2 = collection["a2"].ToString();
    //....

    model.b = new ClassB();
    model.b.b1 = collection["b1"].ToString();
    model.b.b2 = collection["b2"].ToString();
    //...
}

In my opinion this is the most controllable solution, though it is not the most elegant. It nearly always works.