将 DropDownList 填充到 ASCX 控件中
我想将下拉列表填充到 ASCX 中。 为此，我在控制器中使用 LINQ 查询并将结果填充到 viewModel 中。 从视图生成下拉列表可以，但从 ASCX 不行！ 您知道为什么这行不通吗？
提前致谢:-)
控制器中的代码
var query = from foo in session.Linq<PROJECT.Models.bar>() select foo;
PROJECT.ViewModels.myviewmodel viewModel = new PROJECT.ViewModels.myviewmodel();
viewModel.data = new SelectList(query, "Id", "title");
return View(viewModel);
视图中的代码
<h2>Create</h2>
<%= Html.EditorFor(a => a.evaluation, new { EvaluationTypes = Model.evaluationTypes })%>
<!-- Generate from here is ok -->
<%: Html.DropDownList("foo",Model.evaluationTypes) %>
ASCX 中的代码
<%= ViewData["EvaluationTypes"] %>
<%: Html.DropDownList("foo", ViewData["EvaluationTypes"])%>
I want to fill a dropdownlist into an ASCX.
To do that, in the controler i use a LINQ query and fill the result into a viewModel.
Generate the dropdown is ok from the view but not from the ASCX !
Have you an idea of why this don't work ?
Thank's by advance :-)
Code in controler
var query = from foo in session.Linq<PROJECT.Models.bar>() select foo;
PROJECT.ViewModels.myviewmodel viewModel = new PROJECT.ViewModels.myviewmodel();
viewModel.data = new SelectList(query, "Id", "title");
return View(viewModel);
Code in view
<h2>Create</h2>
<%= Html.EditorFor(a => a.evaluation, new { EvaluationTypes = Model.evaluationTypes })%>
<!-- Generate from here is ok -->
<%: Html.DropDownList("foo",Model.evaluationTypes) %>
Code in ASCX
<%= ViewData["EvaluationTypes"] %>
<%: Html.DropDownList("foo", ViewData["EvaluationTypes"])%>
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评论（1）
我建议您使用强类型编辑器模板并放弃 ViewData:
并在 EditorTemplate 中：
更新：
在发布异常堆栈跟踪后，我发现了问题：
您需要转换为
SelectList您的ViewData["EvaluationTypes"]。话虽这么说，应该通过使用强类型助手来避免那些丑陋的强制转换，正如我在最初的答案中所建议的那样。I would suggest you using a strongly typed Editor Template and abandon ViewData:
and in the EditorTemplate:
UPDATE:
After you've posted your exception stack trace I've spotted the problem:
You need to cast to
SelectListyourViewData["EvaluationTypes"]. This being said those ugly casts should be avoided by using strongly typed helpers as I suggested in my initial answer.