在下拉列表.NET MVC中支持optgroup？

// 创建一个包含optgroup的SelectList
var selectList = new SelectList(
    new List<SelectListItem>
    {
        new SelectListItem { Text = "Option 1", Value = "1", Group = "Group 1" },
        new SelectListItem { Text = "Option 2", Value = "2", Group = "Group 1" },
        new SelectListItem { Text = "Option 3", Value = "3", Group = "Group 2" },
        new SelectListItem { Text = "Option 4", Value = "4", Group = "Group 2" },
    },
    "Value",
    "Text",
    "Group"
);

// 将SelectList绑定到模型属性
@Html.DropDownListFor(m => m.SelectedOption, selectList, "Select an option")