MVC Re-populating posted data in a Html.TextBox from the Model (using Dictionaries)

Question

Hello,

I'm having problems repopulating a TextBox from data coming from a complex structure involving Dictionaries.

So, I have VM structure like this:

public class AnswerVM
{
 public int Index { get; set; }
 public Answer Answer { get; set; }
 public Dictionary<int, QuestionResult> QuestionResults { get; set; }
}
public class QuestionResult
{
 public Dictionary<String, String> UserDefinedTextResult { get; set; }
}

And in my (partial) View, where my Model is an AnswerVM, I have something like this:

<%= Html.Hidden("QuestionResults[0].Key", Model.Answer.QuestionId)%>
<%= Html.Hidden("QuestionResults[0].Value.UserDefinedTextResult[0].Key", Model.Answer.Id)%>
<%= Html.TextBox("QuestionResults[0].Value.UserDefinedTextResult[0].Value") %>
<%= Html.TextBox("Index") %>

The DefaultDataBinder actually works with this, populating correctly my Model inside my Action (doing a regular Post):

public ActionResult Survey()
{
 // AnswerVMInSession is a AnswerVM from the Session :)
 UpdateModel(AnswerVMInSession);
 // Here my AnswerVMInSession does contains the String typed in the Textbox
 return View(AnswerVMInSession);
}

After I re show my View (with the partial view inside it), the (Dictionary) TextBox comes empty (but not the integer one), even though if a put a breakpoint in the View, just before rendering the TextBox, my model does contain the string in its structure.

Any ideas what's going on in here?

Answer 1

Duplicate of http://stackoverflow.com/questions/1133393/model-not-rendering-model-values-after-post