非常简单的情况,这是我的模特:
public class Comment
{
[Required]
public string Name { get; set; }
[Required]
public string Text { get; set; }
}
这是我的控制器:
public class CommentController : Controller
{
//
// GET: /Comment/Create
public ActionResult Create()
{
return View();
}
//
// POST: /Comment/Create
[HttpPost]
public ActionResult Create(FormCollection collection)
{
Comment new_comment = new Comment();
if (TryUpdateModel(new_comment))
{
return View(new Comment()); //problem is there
}
else
{
return View(new_comment);
}
}
}
这是我的标准性的强烈类型观点:
@model test.Models.Comment
@{
ViewBag.Title = "Create";
}
<h2>Create</h2>
<script src="@Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")" type="text/javascript"></script>
@using (Html.BeginForm()) {
@Html.ValidationSummary(true)
<fieldset>
<legend>Comment</legend>
<div class="editor-label">
@Html.LabelFor(model => model.Name)
</div>
<div class="editor-field">
@Html.EditorFor(model => model.Name)
@Html.ValidationMessageFor(model => model.Name)
</div>
<div class="editor-label">
@Html.LabelFor(model => model.Text)
</div>
<div class="editor-field">
@Html.EditorFor(model => model.Text)
@Html.ValidationMessageFor(model => model.Text)
</div>
<p>
<input type="submit" value="Create" />
</p>
</fieldset>
}
<div>
@Html.ActionLink("Back to List", "Index")
</div>
问题:当我输入有效数据时,TryUpdateModel()
会返回true
,
return View(new Comment());
应显示空表单,因为会传递新的空实例,但它仍会显示前面输入的值的表单。
请有人告诉我原因。如何让它再次显示空格?
答案 0 :(得分:4)
清除模型状态:
if (TryUpdateModel(new_comment))
{
ModelState.Clear();
return View(new Comment()); //no more problem here
}
所有HTML帮助程序在渲染其值时首先查看ModelState,然后仅在模型中查看。
甚至更好,更正确地使用Redirect-After-Post模式(即POST成功后重定向):
if (TryUpdateModel(new_comment))
{
return RedirectToAction("Create");
}