MVC Html.DropDownList 访问文本字段

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;
    }

}

我的控制器填充下拉列表如下。

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");

         .........
      }

查看索引

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

不，当我发布/更新时，我会调用不同的操作（比如更新），并且我想访问 Currencycode 以及 CurrencyDescription。我可以获取 Currencycode，但无法访问 CurrencyDescription。

非常感谢任何帮助。

Answer 1

描述（<option>s 的文本）不是从下拉列表（<select> 元素）的表单中发布的。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，您可以简单地使用 SelectListItem 对象的文本和值的描述。

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);

     .........
  }