Question

我在下拉列表中选择了值。

查看

@Html.DropDownList("QuestionType", (IEnumerable<SelectListItem>)ViewData["questiontype"], new { id = "QuestionType", @style = "max-width: 200px;width: 200px", @OnChange = "HideForm(this)", @class = "form-control" })

控制器

var questionTypeList = new SelectList(
                    new List<SelectListItem> 
                    { 
                        new SelectListItem { Value = "1", Text = "Automatic", Selected = false },
                        new SelectListItem { Value = "2", Text = "Custom", Selected = true}
                    }, "Value", "Text"
                ).ToList();
var questionType = new SelectList(questionTypeList, "Value", "Text");
ViewData["questiontype"] = questionType;

我希望在视图中选择true = 2但是我的上面的脚本无效，我该如何解决这个问题？

我修改了我的代码。我没有使用绑定到dropdownlist的strongtype。我正在使用viewdata。这是我的代码：

控制器

List<SelectListItem> questionTypeList = new List<SelectListItem>();
            questionTypeList.Add(new SelectListItem() { Text = "Automatic", Value = "1" });
            questionTypeList.Add(new SelectListItem() { Selected = true, Text = "Custom", Value = "2" });
ViewData["questiontype"] = questionTypeList;

查看

@Html.DropDownList("QuestionType", ViewData["questiontype"] as SelectList,  new { id = "QuestionType", @style = "max-width: 200px;width: 200px", @OnChange = "HideForm(this)", @class = "form-control" })

为什么这段代码有用，以及为什么以前的代码不起作用？我很困惑......

Answer 1

不确定您是否拥有强类型视图，但可以使用

    DropdownlistFor(model=>model.QuestionType, selectlistItem)

然后在你的控制器集中

model.QuestionType to 2;

然后

return View(model);

如何在下拉列表MVC中选择值true

1 个答案: