如何使用WebGrid MVC C#中模型中的下拉列表

public enum UserRole
{
    Admin,
    Manager,
    Employee
}

public class User
{
    public int Id { get; set; }
    public string Name { get; set; }
    public UserRole Role { get; set; }
    public List<SelectListItem> RoleList { get; set; }
}

public ActionResult Create()
{
    var user = new User();
    user.RoleList = new List<SelectListItem>
    {
        new SelectListItem { Text = "Admin", Value = "Admin" },
        new SelectListItem { Text = "Manager", Value = "Manager" },
        new SelectListItem { Text = "Employee", Value = "Employee" }
    };
    return View(user);
}

@model User

@using(Html.BeginForm())
{
    @Html.DropDownListFor(model => model.Role, Model.RoleList)
    <input type="submit" value="Submit" />
}

[HttpPost]
public ActionResult Create(User user)
{
    // 使用user.Role获取用户选择的角色值
    // 其他处理逻辑...
}