Solved

Mvc Empty List linked to the Model

Posted on 2010-09-24
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Last Modified: 2013-11-08
In combination with a ViewModel (for my business logic) I am using the ViewData[""] object to pass lists to my view with data from the database.

I am using 3 lists and I link them to my Model
Only one of these lists has items fetched from the database like so:

ViewData["Materials"] = StockRepository.GetMaterialTypes();

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However... the other 2 lists should be empty by default and will get filled using jQuery when the user selects an item from the first list.

Right now, I have to fake 2 empty lists by returning an empty search from the database.

ViewData["Brands"] = StockRepository.GetBrands();
ViewData["ModelTypes"] = StockRepository.GetModelTypes();

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The GetBrands and GetModelTypes methods actually return nothing. They do something like this to make sure nothing is returned!

        public static IEnumerable<SelectListItem> GetBrands()
        {
            StockManagementDataContext db = new StockManagementDataContext();

            var brands = from m in db.Material
                         [b]where m.Description == "ABC"[/b]
                         select new SelectListItem
                         {
                             Text = m.Description,
                             Value = m.MaterialId.ToString(),
                         };

            return brands;
        }

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My question: is it possible to initialize ViewData["Brands"] with an empty list or is there another more efficient way to link the model to an empty list by default?

Thx

Gerrie
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Question by:gerrie-govaerts
2 Comments
 
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Accepted Solution

by:
ChristoferDutz earned 500 total points
ID: 33754568
Do I understand you correctly. You simply want to return an empty list/enumerator? Then try this (Got this from http://stackoverflow.com/questions/1714351/return-an-empty-ienumerator) (I am assuming you are using C# from the IEnumerable):
public static IEnumerable<SelectListItem> GetBrands()
        {
            return Enumerable.Empty<SelectListItem>();
        }

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0
 

Author Closing Comment

by:gerrie-govaerts
ID: 33758283
Thx that's working - I don't like to use it but I needed some way to link the selected item from a listbox to the ViewModel - but I'll figure it out :-)
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