.NET MVC 3在C#中向SelectListItem添加属性

public class CustomSelectListItem : SelectListItem
{
    public string CustomAttribute { get; set; }
}

List<CustomSelectListItem> items = new List<CustomSelectListItem>
{
    new CustomSelectListItem { Text = "Option 1", Value = "1", CustomAttribute = "CustomValue1" },
    new CustomSelectListItem { Text = "Option 2", Value = "2", CustomAttribute = "CustomValue2" },
    new CustomSelectListItem { Text = "Option 3", Value = "3", CustomAttribute = "CustomValue3" }
};
ViewBag.Items = items;

@Html.DropDownList("DropDownList", (IEnumerable<SelectListItem>)ViewBag.Items, "Select an option", new { @class = "form-control" })