MVC 5-如何在DropDownListFor HTML助手中設置“selectedValue”問題是：如何在DropDownListFor HTML助手中設置selectedValue？嘗試了大多數其他的解決方案，但都沒有奏效，這就是為什么我要提出一個新的問題。這些都沒有幫助：@Html.DropDownListFor(m => m.TipPopustaId, new SelectList(Model.TipoviDepozita, "Id", "Naziv", 2), htmlAttributes: new { @class = "form-control" })//Not working with or without [email protected](m => m.TipPopustaId, new SelectList(Model.TipoviDepozita, "Id", "Naziv", (ProjectName.Models.TipDepozita)Model.TipoviDepozita.Single(x => x.Id == 2)), htmlAttributes: new { @class = "form-control" })@Html.DropDownListFor(m => m.TipPopustaId, new SelectList(Model.TipoviDepozita, "Id", "Naziv", (ProjectName.Models.TipDepozita)Model.TipoviDepozita.Where(x => x.Id == 2).FirstOrDefault()), htmlAttributes: new { @class = "form-control" })@Html.DropDownListFor(m => m.TipPopustaId, new SelectList(Model.TipoviDepozita, "Id", "Naziv", new SelectListItem() { Value="2", Selected=true}), htmlAttributes: new { @class = "form-control" })如果可能的話，我希望避免手動創建SelectListItems或ViewModel。
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叮當貓咪
TA貢獻1776條經驗 獲得超12個贊
public static class EnumHelper{
public static SelectList EnumToSelectList<TEnum>(this Type enumType, object selectedValue)
{
return new SelectList(Enum.GetValues(enumType).Cast<TEnum>().ToList().ToDictionary(n=> n), "Key", "Value", selectedValue);
}}@Html.DropDownListFor(model => model.Role, EnumHelper.EnumToSelectList<Role>(typeof(Role), Model.Role),
new { htmlAttributes = new { @class = "padding_right" } })@Html.ValidationMessageFor(model => model.Role, "", new { @class = "text-danger" })- 3 回答
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