Question

昨天我问了以下问题Html.Dropdown - get the the value of each option to be the same as the text?，当我找到以下帖子时What HTML helper do I use to create a simple dropdownlist that doesn't take in any variables? 现在这一切都很好，但是，如何选择默认值（如月度），这是我的代码......

<%: Html.DropDownList("day", new SelectList(
    new Dictionary<string,string> { { "Weekly", "Weekly" }, { "Monthly", "Monthly" }, { "Quarterly", "Quarterly" }, { "Annually", "Annually" } },
    "Key", "Value"))
%>

任何帮助都会受到赞赏，因为我还没有找到解释这个相当简单的要求的例子，也许我应该购买一本关于MVC的书？

Answer 1

使用this重载

    public SelectList(IEnumerable items, string dataValueField, string dataTextField, object selectedValue);

最后一个参数是选中的值。您可以将方法重写为

 <%: Html.DropDownList("day", new
 SelectList(
     new Dictionary<string,string> { { "Weekly", "Weekly" }, { "Monthly",
 "Monthly" }, { "Quarterly",
 "Quarterly" }, { "Annually",
 "Annually" } },
     "Key", "Value", "Monthly")) %>

ASP.NET MVC Html.Dropdown - 设置默认值

1 个答案: