Question

I have a problem with an ASP.NET MVC page that shows a list of orders being dispatched to a particular location. The page is called Orders/DispatchToCentre/2 where 2 is the ID of the Centre from the database and it displays fine.

The trouble is that I want to be able to postback changes to the orders on the page, so I’m doing this:

<dl class="orders">
@foreach (OrderViewModel ovm in Model)
{
    <dd>@ovm.User.Name </dd>
    <dt>
    @Html.Partial("OrderTable", ovm)
    <p>
    @using (Html.BeginForm("Dispatch", "Order", new { id = ovm.Id }, FormMethod.Post ) )
    {
       @Html.TextBox("id", ovm.Id );
       @Html.Hidden("OriginatingPage", Request.Path);
       <input type="submit" name="[e-mail]" value="Order dispatched" />         
    }   
    </p>

    </dt>
}
</dl>

The problem is that when I look at the page source I get this:

  <p>
    <form action="/Order/Dispatch/3f180e5b-d112-4245-98ef-602e86eccda6" method="post">
      <input id="id" name="id" type="text" value="2" />
      <input id="OriginatingPage" name="OriginatingPage" type="hidden" value="/Order/DispatchToCentre/2" />       
      <input type="submit" name="submit-3f180e5b-d112-4245-98ef-602e86eccda6" value="Order dispatched" />         
    </form>    
  </p>

The id input appears to have totally ignored the OrderViewModel.Id that I am explicitly setting it to ( this should be a Guid ) and automatically set itself to use the Centre Id from the path instead.

Is there some configuration I need to use to avoid this bit of interfering automagicalness or am I best just to ignore the helper here and create the field manually? Obviously, the latter is a fairly trivial task but it would be helpful to understand if I am conceptually misunderstanding some important facet of the Razor rendering action or I’m just running into a quirk.

Answer 1

In controller, HttpGet action, before returning view, you should call

ModelState.Remove("id");

Fact is that ModelState has higher priority in providing model values than the model itself, so value from ModelState is always preferred (if any) over model value