ASP.Net MVC DefaultModelBinder not binding properties on POST

Question

I'm facing a really strange problem that has me smoked.

I have a fairly simple scenario where I have a strongly typed view that is correctly populated from the controller on the GET, but then when it POSTS the form to the controller, the Reqeust is full of all the right values and right key names for the default model binder to correctly populate one of my model objects, and the DMB creates the correct opject, but it never populates any of the properties, they're all in their default state.

This was working before, the only changes I can think of were that I tried a custom modelbinder (then removed it; double checked to make sure I'm not still using that), and I refactored the model to have a base class with some of the props.

Any thoughts?

Answer 1

A very similar scenario - that the DefaultModelBinder is - essentially - not binding to your model, arrise if you would give your bound model object the same name as one of its properties:

Model

Public Property ArbitraryName1 As Integer
Public Property Answer As String
Public Property ArbitraryName2 As Boolean

View

<p/> ... @Model.ArbitraryName1
<p/> Answer: @Html.TextBoxFor(Function(model) model.Answer)
<p/> ... @Html.CheckBoxFor(Function(model) model.ArbitraryName2)

Controller

<HttpPost()>
Function Index(answer As Model) As ActionResult
  ' answer is Nothing
End Function

(Using ASP.NET MVC 3)