根据数据库ASP.NET MVC返回的值，在下拉列表中选择值

Question

我有以下代码

@Html.LabelFor(model => model.UserRole)
@Html.DropDownListFor(model => model.UserRole, new List<SelectListItem>
{
    new SelectListItem { Value = "Manager(SDD)" , Text = "Manager(SDD)" },
    new SelectListItem { Value = "Manager(QA)" , Text = "Manager(QA)" },
    new SelectListItem { Value = "Manager(Operations)" , Text = "Manager(Operations)" },
    new SelectListItem { Value = "Team Lead(SDD)" , Text = "Team Lead(SDD)" },
    new SelectListItem { Value = "Team Lead(QA)" , Text = "Team Lead(QA)" },
    new SelectListItem { Value = "Team Lead(Operations)" , Text = "Team Lead(Operations)" },
    new SelectListItem { Value = "Lead Developer(SDD)" , Text = "Lead Developer(SDD)" }
}, "Select one", new { @class = "form-control" })

现有角色：（@ ViewBag.erole）`

现在我只想让DropDownlist的默认列表项是从数据库返回的列表项，它放在ViewBag.erole中。