How to bind Lists of a custom view model to a dropDownList an get the selected value after POST in A

Posted by user187220 on Stack Overflow See other posts from Stack Overflow or by user187220
Published on 2010-06-11T07:19:52Z Indexed on 2010/06/11 7:22 UTC
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I have following problem. In my view model I defined some list properties as follows:

public class BasketAndOrderSearchCriteriaViewModel
{
    List<KeyValuePair> currencies;
    public ICollection<KeyValuePair> Currencies
    {
        get
        {
            if (this.currencies == null)
                this.currencies = new List<KeyValuePair>();
            return this.currencies;
        }
    }

    List<KeyValuePair> deliverMethods;
    public ICollection<KeyValuePair> DeliveryMethods
    {
        get
        {
            if (this.deliverMethods == null)
                this.deliverMethods = new List<KeyValuePair>();
            return this.deliverMethods;
        }
    }
 }

This view model is embedded in another view model:

 public class BasketAndOrderSearchViewModel
 {
    public BasketAndOrderSearchCriteriaViewModel Criteria
    {
        [System.Diagnostics.DebuggerStepThrough]
        get { return this.criteria; }
    }
 }

I use 2 action methods; one is for the GET and the other for POST:

[HttpGet]
public ActionResult Search(BasketAndOrderSearchViewModel model){...}

[HttpPost]
public ActionResult SubmitSearch(BasketAndOrderSearchViewModel model){...}

In the view I implement the whole view model by using the EditorFor-Html Helper which does not want to automatically display DropDownLists for List properties! 1. Question: How can you let EditorFor display DropDownLists?

Since I could not figure out how to display DropDownLists by using EditorFor, I used the DropDownList Html helper and filled it through the view model as follows:

    public IEnumerable<SelectListItem> DeliveryMethodAsSelectListItem()
    {
        List<SelectListItem> list = new List<SelectListItem>();
        list.Add(new SelectListItem()
        {
            Selected = true,
            Text = "<Choose Delivery method>",
            Value = "0"
        });
        foreach (var item in this.DeliveryMethods)
        {
            list.Add(new SelectListItem()
            {
                Selected = false,
                Text = item.Value,
                Value = item.Key
            });
        }

        return list;
    }

My 2. question: As you can see I pass my view model to the action metho with POST attribute! Is there a way to get the selected value of a DropDownList get binded to the passed view model? At the moment all the DropDownList are empty and the selected value can only be fetched by the Request.Form which I definitely want to avoid!

I would greatly appreciate some ideas or tips on this!

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