Asp.net mvc 2 在选择列表中设置默认值

我有下面的类和编辑器模板，用于为各种货币创建dropdownlist

public class Currency
{
    public string CurrencyId { get; set; }
    public string CurrencyName { get; set; }
}

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<List<morkyc.Core.Model.Currency>>" %>

<tr>
    <td style="width:50%;">
    <label class="fieldLabel">
    Specify Currency :
    </label>
    </td>
    <td>
        <%= Html.DropDownListFor(model => model, new SelectList(Model, "CurrencyId", "CurrencyName", ))%>
     </td>
</tr>

公共类货币
{
公共字符串CurrencyId{get；set；}
公共字符串CurrencyName{get；set；}
}
指定货币：
型号，新选择列表（型号，“CurrencyId”，“CurrencyName”，）%>

我在控制器中创建一个列表

 List<Currency> lCurrencyList = new List<Currency>(new Currency[]
        {
            new Currency{CurrencyId = "AED", CurrencyName = "United Arab Emirates Dirham (AED)"}, 
            new Currency{CurrencyId = "AFN", CurrencyName = "Afghan Afghani (AFN)"}, 
            new Currency{CurrencyId = "ALL", CurrencyName = "Albanian Lek (ALL)"}, 
            new Currency{CurrencyId = "AMD", CurrencyName = "Armenian Dram (AMD)"}, 
            new Currency{CurrencyId = "ANG", CurrencyName = "Netherlands Antillean Guilder (ANG)"},
            new Currency{CurrencyId = "AOA", CurrencyName = "Angolan Kwanza (AOA)"},
            new Currency{CurrencyId = "ARS", CurrencyName = "Argentine Peso (ARS)"}, 
            new Currency{CurrencyId = "AUD", CurrencyName = "Australian Dollar (AUD)"}, 
            new Currency{CurrencyId = "AWG", CurrencyName = "Aruban Florin (AWG)"}, 
            new Currency{CurrencyId = "AZN", CurrencyName = "Azerbaijani Manat (AZN)"}, 
            new Currency{CurrencyId = "BAM", CurrencyName = "Bosnia-Herzegovina Convertible Mark (BAM)"}, 
            new Currency{CurrencyId = "BBD", CurrencyName = "Barbados Dollar (BBD)"}, 
            new Currency{CurrencyId = "BDT", CurrencyName = "Bangladeshi Taka (BDT)"}, 
            new Currency{CurrencyId = "BGN", CurrencyName = "Bulgarian Lev (BGN)"},
new Currency{CurrencyId = "ZWD", CurrencyName = "Zimbabwe Dollar (ZWD)"}
        });

List lCurrencyList=新列表（新货币[]
{
新货币{CurrencyId=“AED”，CurrencyName=“阿拉伯联合酋长国迪拉姆（AED）”，
新货币{CurrencyId=“AFN”，CurrencyName=“阿富汗阿富汗尼（AFN）”}，
新货币{CurrencyId=“ALL”，CurrencyName=“阿尔巴尼亚列克（ALL）”，
新货币{CurrencyId=“AMD”，CurrencyName=“亚美尼亚德拉姆（AMD）”}，
新货币{CurrencyId=“ANG”，CurrencyName=“荷兰安的列斯盾（ANG）”，
新货币{CurrencyId=“AOA”，CurrencyName=“安哥拉宽扎（AOA）”}，
新货币{CurrencyId=“ARS”，CurrencyName=“阿根廷比索（ARS）”}，
新货币{CurrencyId=“AUD”，CurrencyName=“澳元（AUD）”}，
新货币{CurrencyId=“AWG”，CurrencyName=“阿鲁班·弗洛林（AWG）”}，
新货币{CurrencyId=“AZN”，CurrencyName=“阿塞拜疆马纳特（AZN）”}，
新货币{CurrencyId=“BAM”，CurrencyName=“波斯尼亚和黑塞哥维那可兑换马克（BAM）”}，
新货币{CurrencyId=“BBD”，CurrencyName=“巴巴多斯美元（BBD）”}，
新货币{CurrencyId=“BDT”，CurrencyName=“孟加拉塔卡（BDT）”}，
新货币{CurrencyId=“BGN”，CurrencyName=“保加利亚列夫（BGN）”}，
新货币{CurrencyId=“ZWD”，CurrencyName=“津巴布韦元（ZWD）”}
});

在我的视图中，我调用以下视图来创建dropdownlist

model.Currency）%%>

这很好用

---

有人能建议我如何设置默认的选定项目吗

您的编辑器模板是强类型的货币列表。另外，您正在将列表作为第一个参数传递给

DropDownListFor

帮助程序，这是不好的。您永远不会传递某些选定的值，因此在此编辑器模板中，您最好将该值设置为此列表的第一个元素（例如）

<%= Html.DropDownListFor(
    model => model, 
    new SelectList(Model, "CurrencyId", "CurrencyName", "AED")
)%>

最后，在视图中调用自定义编辑器模板：

<%@ Control 
    Language="C#" 
    Inherits="System.Web.Mvc.ViewUserControl<CurrencyViewModel>" %>

<tr>
    <td style="width:50%;">
        <label class="fieldLabel">
            Specify Currency :
        </label>
    </td>
    <td>
        <%= Html.DropDownListFor(
            model => model.SelectedCurrency, 
            new SelectList(Model.Currencies, "Value", "Text")
        )%>
     </td>
</tr>

<%= Html.EditorForModel() %>

public ActionResult Foo()
{
    var model = new CurrencyViewModel
    {
        // Define the selected value here
        SelectedCurrency = "AED",
        Currencies = new[]
        {
            new SelectListItem { Value = "AED", Text = "United Arab Emirates Dirham (AED)" }, 
            new SelectListItem{ Value = "AFN", Text = "Afghan Afghani (AFN)"}, 
            ...
        }
    };
    return View(model);
}

<%= Html.EditorForModel() %>