绑定DropdownlistFor与Viewbag [英] Bind DropdownlistFor with the Viewbag

问题描述

我想绑定的DropDownListFor助手与控制器中定义的viewbag。但我正在逐渐错误。

查看code： -

  @ Html.DropDownListFor（型号=＆GT; model.CurrencyID，ViewBag.CurrencyList为SelectListItem））
 

控制器code： -

  

 公众的ActionResult的Create（）
＆GT; {
＆GT; VAR内容=由对在db.Currency
＆GT;其中，p.IsActive ==真
＆GT;排序依据p.CurrencyName
＆GT;选择新的{p.CurrencyID，p.Currency code};
＆GT;
＆GT; 。VAR X = content.ToList（）选择（C =＆gt;新建SelectListItem
＆GT; {
＆GT;文本= c.Currency code，
＆GT;值= c.CurrencyID.ToString（），
＆GT;选择=（c.CurrencyID == 68）
＆GT; }）了ToList（）。
＆GT; ViewBag.CurrencyList = X;
＆GT;
＆GT;返回查看（）;
＆GT; }
 

收到

错误： -
System.Web.Mvc.HtmlHelper'不包含定义'DropDownListFor'和最佳推广方法重载'System.Web.Mvc.Html.SelectExtensions.DropDownListFor（System.Web.Mvc.HtmlHelper，System.Linq.Ex pressions.Ex pression>，System.Collections.Generic.IEnumerable）'有一些无效参数

解决方案

您需要修改

  @ Html.DropDownListFor（型号=＆GT; model.CurrencyID，ViewBag.CurrencyList为SelectListItem））
 

到

  @ Html.DropDownListFor（型号=＆GT; model.CurrencyID，ViewBag.CurrencyList为IEnumerable＆LT; SelectListItem＆GT;）
 

I am trying to bind the DropDownListFor helper with the viewbag defined in the controller. But i am getting error.

View Code:-

@Html.DropDownListFor(model => model.CurrencyID, ViewBag.CurrencyList as SelectListItem)) 

Controller Code:-

 public ActionResult Create()
>  {
>    var content = from p in db.Currency
>                  where p.IsActive == true
>                  orderby p.CurrencyName
>                  select new { p.CurrencyID, p.CurrencyCode };
> 
>    var x = content.ToList().Select(c => new SelectListItem         
>                            {
>                               Text = c.CurrencyCode,
>                               Value = c.CurrencyID.ToString(),
>                               Selected = (c.CurrencyID == 68)
>                            }).ToList();
>             ViewBag.CurrencyList = x;
> 
>             return View();            
>         }

Error Received:- System.Web.Mvc.HtmlHelper' does not contain a definition for 'DropDownListFor' and the best extension method overload 'System.Web.Mvc.Html.SelectExtensions.DropDownListFor(System.Web.Mvc.HtmlHelper, System.Linq.Expressions.Expression>, System.Collections.Generic.IEnumerable)' has some invalid arguments

解决方案

You need to change

@Html.DropDownListFor(model => model.CurrencyID, ViewBag.CurrencyList as SelectListItem))

to

@Html.DropDownListFor(model => model.CurrencyID, ViewBag.CurrencyList as IEnumerable<SelectListItem>)

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