MVC DropDownListFor - 验证失败后,我必须手动重新填充选项吗？

public ActionResult YourAction()
{
    // 验证失败后重新填充的选项列表
    List<SelectListItem> options = new List<SelectListItem>
    {
        new SelectListItem { Value = "1", Text = "Option 1" },
        new SelectListItem { Value = "2", Text = "Option 2" },
        new SelectListItem { Value = "3", Text = "Option 3" }
    };

    // 将选项列表传递给视图
    ViewBag.Options = options;

    // 其他逻辑...

    return View();
}

[HttpPost]
public ActionResult YourAction(YourModel model)
{
    if (ModelState.IsValid)
    {
        // 验证成功，处理其他逻辑...
        return RedirectToAction("Success");
    }
    else
    {
        // 验证失败，重新填充选项列表
        List<SelectListItem> options = new List<SelectListItem>
        {
            new SelectListItem { Value = "1", Text = "Option 1" },
            new SelectListItem { Value = "2", Text = "Option 2" },
            new SelectListItem { Value = "3", Text = "Option 3" }
        };

        // 将选项列表传递给视图
        ViewBag.Options = options;

        return View(model);
    }
}

@model YourNamespace.YourModel

@using (Html.BeginForm())
{
    @Html.DropDownListFor(m => m.YourProperty, (IEnumerable<SelectListItem>)ViewBag.Options, "Please select an option")
    @Html.ValidationMessageFor(m => m.YourProperty)
    <input type="submit" value="Submit" />
}