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I am trying set up a simple dropdown list but I dont seem to be able to get it to bind to the Model. I am using Asp.Net MVC and nhibernate.

My dropdown list is declared like so:

<%= Html.DropDownListFor(model => model.Project, (IEnumerable<SelectListItem>)ViewData["Projects"], " -- Select -- ", new { name = "Project" })%>

I set up the select list like so:

ViewData["Projects"] = new SelectList(projectRepository.GetAll(), "EntityGUID", "Name", editEntity.Project);

This seems to bind the select list to the Dropdown fine, but the SelectedValue is not set. it shows up as the default --- Select ---

Also when I save this data, the dropdown does not bind to the model, I have to manually set the object like so to save it:

entity.Project = projectRepository.GetById(new Guid(Request["Project"].ToString()));

I believe I have take the correct messures to have this item bind directly to my model. Is there something I am missing here?

Many thanks for your time, Rod

DaveRandom
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Rod McLeay
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2 Answers2

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OMG I found the problem........

It has taken me 3 days to turn:

<%= Html.DropDownListFor(model => model.Aspect, (IEnumerable<SelectListItem>)ViewData["AspectTypes"])%>

into:

<%= Html.DropDownListFor(model => model.Aspect.EntityGUID, (IEnumerable<SelectListItem>)ViewData["AspectTypes"])%>

model.Aspect**.EntityGUID** I had to bind the drop down to the objects guid, not the object itself. Doh....Im feeling the pain, much work to catch up on.

Thanks for your time.

Rod McLeay
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This is just a hunch since your code looks good to me but I don't think you need to include the forth parameter when defining your SelectList. Setting that field might be distrupting the normal flow of things (overriding your model binding) and I have never bound a DropDownList and had the SelectList's SelectedValue set.

Try removing that and see how it goes.

SelectList(projectRepository.GetAll(), "EntityGUID", "Name");

Also I asked a question a while back regarding how to implement DropDownList in MVC2 that you might find useful.

Community
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Kelsey
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  • Thanks Kelsey, I'll check out the article. The SelectedValue parameter was only my last attemp. On the whole I haven't used it. I just set it to try to preselect the value in the edit form. I think it may be an issue in my nhibernate mapping, not setting the child object. I'll look down that route. – Rod McLeay Apr 30 '10 at 04:41
  • I get this error when I dont set Lazy loading to false in the nhibernate mapping. Initializing[AgileThought.ERP.Domain.Property.Project#8260fd30-97e7-46f4-818a-689f1e65a91c]-Could not initialize proxy - no Session. – Rod McLeay Apr 30 '10 at 04:54
  • And when I try to edit it, I am getting the following Model Validation error. The value 'fd38c877-706f-431d-b624-1269184eeeb5' is invalid. This suggests its trying to push my GUID into the object. Pulling my hair out... – Rod McLeay Apr 30 '10 at 04:57
  • I think I'll raise a Nhibernate question. Thanks for you time. – Rod McLeay Apr 30 '10 at 04:58