ASP .NET HTML.DropDownListFor

Question

I have this line of code in my view but it doesn't work. It keeps throwing this error:

The ViewData item that has the key 'Material.Modelo.Categoria.Familia_Id' is of type 'System.Int32' but must be of type 'IEnumerable'

<%= Html.DropDownListFor(model => model.Material.Modelo.Categoria.Familia_Id, 
                                  Model.Familias, 
                                  " -- Seleccione -- ")%>

Model.Familias is actually a SelectList and model.Material.Modelo.Categoria.Familia_Id is an integer.

Any ideas?

Thnx

Community · Accepted Answer · 2017-05-23 11:47:39Z

0

Html.DropDownListFor expects to be passed a collection (something that imlements IEnumberable) so that it can build a drop down of these items.

You're passing it a single integer.

Assuming you have a drop down with just one item in it then add that integer to a collection of some sort and pass the collection. A List, or any other collection implementing IEnumerable, will work fine.

Check out this post...

Populating ASP.NET MVC DropDownList

... for details on how to populate one of these.

edited May 23, 2017 at 11:47

CommunityBot

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answered Oct 8, 2010 at 17:47

Martin Peck

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3 Comments

Chris Kooken Over a year ago

The first Param in DropDownListFor is the property in the model you want to send back to the controller that is selected, the SECOND one is the IEnumerable collection. It looks to me like she is doing it right.

tina Over a year ago

Exactly... and actually I have this: <%= Html.DropDownListFor(model => model.Material.Modelo_Id, Model.Modelos," -- Seleccione -- ") %> and that works fine. So, what may be happening?

Martin Peck Over a year ago

Notice the use of SelectList in the answer that I refer to. I think that's the difference.

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