c# - When I post back to my controller all values for my model are null

Question

I have cut the model back to one field:

//Model

public class LetterViewModel
{
    public string LetterText;
}

//Controller

public ActionResult Index()
{
    var model = new LetterViewModel();
    model.LetterText = "Anything";

    return View(model);
}

[HttpPost]
public ActionResult Index(LetterViewModel model)
{ 
    //model.LetterText == null
    return View(model);
}

//view

@model Test.Models.LetterViewModel
@{
    Layout = "~/Views/Shared/_Layout.cshtml";
    ViewBag.Title = "Create a Letter";
}
@using (Html.BeginForm())
{
    <div id="Bottom">
        @Html.TextAreaFor(m => m.LetterText)
        <input type="submit" value="Ok" class="btn btn-default" />
    </div>
}

When I check the Network tab in dev tools it is showing the value entered is being included in the request. However, when the HttpPost controller is fired the field is empty.

Answer 1

The DefaultModelBinder does not set the value of fields, only properties. You need to change you model to include properties

public class LetterViewModel
{
    public string LetterText { get; set; } // add getter/setter
}