Question

我在访问Html.DropdownList的选定值中的文本字段时遇到问题。

我的ViewModel是

public class UserViewModel
{     
    public List<SelectListItem> SupportedCurrency
    {
        get;
        set;
    }


    public string DefaultCurrency
    {
        get;
        set;
    }

}

我的控制器按下面的方式填充下拉列表。

public List<SelectListItem> GetSupportedCurrencies(string setupValue)
    {
        List<SelectListItem> items = new List<SelectListItem>();

        try
        {
            IList<Currency> currencyList  = Helper.GetFormattedCurrenciesList(CurrenciesService.GetSupportedCurrencies());

            foreach (Currency c in currencyList)
            {
                if (!string.IsNullOrEmpty(setupValue) && c.CurrencyCode.Equals(setupValue))
                {                        
                    items.Add(new SelectListItem
                    {
                        Text = c.CurrencyDescription,
                        Value = c.CurrencyCode,
                        Selected = true
                    });
                }
                else
                {
                    items.Add(new SelectListItem
                    {
                        Text = c.CurrencyDescription,
                        Value = c.CurrencyCode
                    });
                }
            }
        }
        catch (Exception ex)
        {
           throw ex
        }

        return items;
    }



[AcceptVerbs(HttpVerbs.Get)]
    public ActionResult Index()
    {

     userViewData.SupportedCurrency = GetSupportedCurrencies(userModelData.DefaultCurrency);
            SelectList SupportedCurrencyList = new SelectList(userViewData.SupportedCurrency, "CurrencyCode", "CurrencyDescription");

         .........
      }

在查看索引中＆lt;％= Html.DropDownList（“userViewModel.DefaultCurrency”，Model.SupportedCurrency）％＆gt;

......................

当我发布/更新时，我会调用不同的操作（比如更新），我想访问Currencycode和CurrencyDescription。我可以获得Currencycode，但我无法访问CurrencyDescription。

非常感谢任何帮助。

Answer 1

描述（<option> s的文本）未从下拉列表（<select>元素）的表单中发布。您可以做的是在服务器上维护描述到值的映射，以便快速查找。或者您可以简单地将描述用于SelectListItem对象的文本和值。

Answer 2

我建议这样做：

public List<SelectListItem> GetSupportedCurrencies()
{
    List<SelectListItem> items = new List<SelectListItem>();

    try
    {
        IList<Currency> currencyList  = Helper.GetFormattedCurrenciesList(CurrenciesService.GetSupportedCurrencies());

        foreach (Currency c in currencyList)
        {
            items.Add(new SelectListItem
            {
                Text = c.CurrencyDescription,
                Value = c.CurrencyCode
            });
        }
    }
    catch (Exception ex)
    {
       throw ex
    }

    return items;
}

[AcceptVerbs(HttpVerbs.Get)]
public ActionResult Index()
{

 userViewData.SupportedCurrency = GetSupportedCurrencies();
        SelectList SupportedCurrencyList = new SelectList(userViewData.SupportedCurrency, "Value", "Text", userModelData.DefaultCurrency);

     .........
  }

访问文本字段的MVC Html.DropDownList

2 个答案: