How to bind a nested object in a html.dropdownlist (mcv5)

Question

0.00/5 (No votes)

See more:

i have 3 classes.

Person, Address, Country.

Person n:1 Address
Address n:1 Country.

my EF model is working correctly but...

when i use scaffolding to generate my Address views it works.

and

when i use scaffolding to generate my Person and manually add the address fields.

the dropdownlist doesnt work.

when i check my model in debugmode, the CountryId is = 0.

what can i do?

srry if my englitch is terrible bad im a little noobie

<div class="form-group">
    @Html.LabelFor(model => model.Address.IdCountry, "IdCountry", htmlAttributes: new { @class = "control-label col-md-2" })
    <div class="col-md-10">
        @Html.DropDownList("IdCountry", null, htmlAttributes: new { @class = "form-control" })
        @Html.ValidationMessageFor(model => model.Address.IdCountry, "", new { @class = "text-danger" })
     </div>
</div>

Posted 13-Jan-16 13:26pm

Icc Angel Guillermo Coeto Roque

Updated 14-Jan-16 4:20am

Dave Kreskowiak

v4

Add a Solution

Comments

Nathan Minier 14-Jan-16 7:42am

Use the "Improve Question" link and add in the Razor which has your dropdown and the action that populates it. We can start from there.

Icc Angel Guillermo Coeto Roque 14-Jan-16 9:24am

tankyou there is my code i really apreciate your help

John C Rayan 14-Jan-16 10:31am

Your action method code will help us.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Nathan Minier · Answer 1 · 2016-01-14T04:29:00

Okay, CountryId is coming through as 0 since that's the default value for an int value (or is it supposed to be IdCountry, as that's shown in your code).

You'll want to use a slightly different helper class, the Html.DropDownListFor(). It should look like this:

C#

@Html.DropDownListFor(model => model.IdCountry, Model.mySelectListItems, new { @class = "form-control" })

Now, you'll need to make a couple of changes on the model side. Since I don't know your model name, I'll just call it ViewModel:

C#

public class ViewModel
{
   ...
   public IEnumerable<selectlistitem> mySelectListItems
   ...
}
</selectlistitem>

And finally, since I don't know how you're building your ViewModel, we'll look at a controller-based implementation:

C#

public ActionResult MyViewAction()
{
   ...
   // After the ViewModel object has been created
   ViewModelInstance.mySelectListItems = 
      MyDbContext.Countries.Select(x => 
         new SelectListItem { 
            Value = x.Id, 
            Text = x.Name 
      }).ToArray();
   ...
}

There is a fairly comprehensive walkthrough at:
DropDownListFor with ASP.NET MVC[^]