DropDownList SelectList SelectedValue问题 [英] DropDownList SelectList SelectedValue issue

问题描述

可能重复：

如何让ASP.NET MVC SelectList工作？

到底是什么？ MVC3的DropDownList中有没有一个bug？
SelectedValue不会在标记中显示为实际选择。

What the hell is it? Is there some kind of a bug in DropDownList of MVC3? SelectedValue doesn't show up as actually selected in the markup.

我正在尝试不同的方法，没有任何作用。

I am trying different approaches, nothing works.

public class SessionCategory
{
    public int Id { get; set; }
    public string Name { get; set; }
}

public static IEnumerable<SessionCategory> Categories
{
     get
      {
          var _dal = new DataLayer();
          return _dal.GetSesionCategories();
      }
}

@{
        var cats = Infrastructure.ViewModels.Session.Categories;
        var sl = new SelectList(cats, "Id", "Name",2);
}
@Html.DropDownList("categories", sl);

推荐答案

我想您需要将选定的值设为字符串。使用扩展方法也有一些价值。详细的这里。

I think you need to make the selected value a string. There's also some value in using extension methods as detailed here.

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