我的问题是,当我提交表单并返回类型为QuestionViewModel的viewModel时--Type为null。
见下面的代码。
我的控制器:
public ActionResult Create()
{
var viewModel = new QuestionViewModel {
Question = question,
Type = questionType,
Types = surveyDB.QuestionTypes.ToList()
};
return View(viewModel);
}
在我看来:
`
<h2>Skapa en fråga</h2>
<% Html.EnableClientValidation(); %>
<% using (Html.BeginForm()) {%>
<%: Html.ValidationSummary(true) %>
<%:Html.EditorFor(model => model.Question, new { Types = Model.Types }) %>
<% switch (Model.Question.Type) {
case 1:
Response.Write(Html.EditorFor(model => model.Type));
break;
default:
break;
}
%>
<p>
<input type="submit" value="Skapa" />
</p>
<% } %>
`
model.Question的编辑器
<%: Html.LabelFor(model => model.Type) %>
<%:Html.DropDownList("Type", new SelectList(ViewData["Types"] as IEnumerable,"Id","Type", Model.Type), "Välj en frågetyp")%>
<% if((int)ViewData["type"] > 0) { %>
<div class="editor-label">
<%: Html.LabelFor(model => model.Text) %>
</div>
<div class="editor-field">
<%: Html.TextBoxFor(model => model.Text) %>
<%: Html.ValidationMessageFor(model => model.Text) %>
</div>
model.Type的编辑
<%: Html.LabelFor(model => model.Alternative) %>
<%: Html.TextAreaFor(model => model.Alternative, new { @Class="alternatives" })%>
<%: Html.ValidationMessageFor(model => model.Alternative)%>
当我现在提交时,我最终到了这里:
[HttpPost]
public ActionResult Create(QuestionViewModel viewModel)
{
**// This becomes null**
string alternatives = viewModel.Type.Alternatives;
}
我的viewmodel看起来像这样
namespace ASurvey.ViewModels {
public class QuestionViewModel {
public Question Question { get; set; }
public List<QuestionType> Types { get; set; }
public MultipleChoice Type { get; set; }
}
}
答案 0 :(得分:1)
在问题编辑器中,您有代码Html.DropDownList("Type" ...
。看起来它会覆盖你的QuestionViewModel.Type编辑器。
尝试在问题编辑器中使用Html.DropDownListFor(x => x.Type ...
。它将名称属性呈现为“Question.Type”,但不仅仅是“Type”。