Question

我不明白如何在控制器中传递这个selectListitem，如何将其发送到视图？使用return view("MyView", listItems )？但它说listItems在当前的背景下并不存在！你有个主意吗？感谢

@{
   List<SelectListItem> listItems= new List<SelectListItem>();
   listItems.Add(new SelectListItem
        {
          Text = "Exemplo1",
          Value = "Exemplo1"
        });
   listItems.Add(new SelectListItem
        {
            Text = "Exemplo2",
            Value = "Exemplo2",
            Selected = true
        });
   listItems.Add(new SelectListItem
        {
            Text = "Exemplo3",
            Value = "Exemplo3"
        });
}

@Html.DropDownListFor(model => model.tipo, listItems, "-- Select Status --")

我确切地说，我的视图中已有一个模型。我想用下拉列表填写表单的一个字段。这就是我为什么要使用HtmlHelper DropDownListFor的原因。

Answer 1

您将要定义模型，并将该模型类传递到视图中。 Ditch ViewBag并使用强类型模型。

public class ViewModel
{
  public int ddlSelectedValue {get; set;}
  List<System.Web.Mvc.SelectListItem> DDLItems { get; set; } //Instantiate this through Constructor    
}


ViewModel model = new ViewModel();

int val = 5;
model.DDLItems.Add( new SelectListItem() { Text = "Text", Value = Val.ToString() });

return view (model)

View
@model NameSpace.ViewModel


@Html.DropDownListFor(x => x.ddlSelectedValue, Model.DDLItems)

Answer 2

在这里观看 @ {

List<User> listaUsers = (List<User>)ViewBag.ListUser;

}

                foreach (User us in listaUsers)
                {

                        <option value="@us.UserID">@us.Name</option>

                }

        </select>


    /// Name function its like name of view for binding this part go to the controller
    public ActionResult anytingName()
    {
        User us= new User();
        us.Name="paul";
        us.UserID=1;
        List<User> users= new List<User>();
        users.Add(us);
        ViewBag.ListUser = users;
        return View();
    }

DropDownList C＃Mvc4 Razor

2 个答案: