MVC 4 @ HTML.HiddenFor没有更新上回发 [英] MVC 4 @HTML.HiddenFor are not updating on a postback
问题描述
经与视图状态问题上的一系列的页面访问量 - 在一个页面的剃刀初始视图我使用 Html.HiddenFor 如下：
@ Html.HiddenFor（X =＆GT; Model.err）
@ Html.HiddenFor（X =＆GT; Model.errField）
@ Html.HiddenFor（X =＆GT; Model.errMessage）
@ Html.HiddenFor（X =＆GT; Model.IsMove）
这似乎很好地工作。我隐藏输入标签包含正确的值。然而，当我提交表单 [HTTPPost] ，并在我的控制器动作更新模型。
model.err = transHelper.err;
model.errField = transHelper.errField;
model.errMessage = transHelper.errMessage;
返回查看（模型）;
隐藏字段似乎并不更新，它们包含来自初始视图原始值。然而，当我使用这些字段在另一个方面相同的Razor视图中像这样...
@ *
这似乎不能正确更新... @ Html.HiddenFor（X =＆GT; Model.err）
@ Html.HiddenFor（X =＆GT; Model.errField）
@ Html.HiddenFor（X =＆GT; Model.errMessage）
@ Html.HiddenFor（X =＆GT; Model.IsMove） * @
＆LT;输入类型=隐藏ID =ERRVALUE =@ Model.err/＆GT;
＆LT;输入类型=隐藏ID =errFieldVALUE =@ Model.errField/＆GT;
＆LT;输入类型=隐藏ID =errMessageVALUE =@ Model.errMessage/＆GT;
＆LT;输入类型=隐藏ID =IsMoveVALUE =@ Model.IsMove/＆GT; ＆LT; / DIV＆GT;
然后输入字段正确更新。我甚至创造了一个视图助手来帮助调试，并在所有情况下，模型似乎已经在的HtmlHelper＆LT正确性;的TModel＆GT; - 我甚至返回的型号为返回JSON（模型）; 和数据的罚款。
在这一点上，我对工作四处奔跑，但没有任何人知道为什么 @ Html.HiddenFor 是脏的。
更新：这里是我的控制器动作
[HttpPost]
公众的ActionResult指数（HomePageModel模型）
{
//交易流程
Transactionr transr =新Transactionr（）;
transr.Process（模型）; model.err = transr.err;
model.errField = transr.errField;
model.errMessage = transr.errMessage; 返回查看（模型）;
}
下面是我的看法：
@model App.Models.HomePageModel
@ {
ViewBag.Title =产品分类程序;
}
＆LT;表ID =FORMDATA方法=邮报行动=/首页/索引＆GT;
@ Html.AntiForgeryToken（）
＆LT;＆字段集GT;
＆LT; DIV＆GT; @ Html.HiddenFor（型号=＆GT; model.err）
@ Html.HiddenFor（型号=＆GT; model.errField）
@ Html.HiddenFor（型号=＆GT; model.errMessage）
@ Html.HiddenFor（型号=＆GT; model.IsMove） ＆LT;输入类型=隐藏ID =myerrVALUE =@ Model.err/＆GT;
＆LT;输入类型=隐藏ID =myerrFieldVALUE =@ Model.errField/＆GT; ＆LT; / DIV＆GT; ＆LT; DIV CLASS =栏目组＆GT;
＆LT; DIV CLASS =山坳span_2_of_2＆GT;
＆LT; DIV CLASS =消息ID =消息＆GT;
@if（Model.err℃，）
{
＆LT;跨度风格=颜色：紫色;＆GT; @ Model.errMessage（@ Model.err） - （@ Model.errField）LT; / SPAN＆GT;
}
否则如果（Model.err大于0）
{
＆LT;跨度风格=颜色：红色;＆GT; @ Model.errMessage（@ Model.err）（@ Model.errField）LT; / SPAN＆GT;
}其他{
＆LT;跨度＆GT; @ Model.errMessage（@ Model.err）（@ Model.errField）LT; / SPAN＆GT;
}
＆LT; / DIV＆GT;
＆LT; / DIV＆GT;
＆LT; / DIV＆GT; ＆LT; DIV CLASS =栏目组ID =工作区＆GT;
@ Html.Partial（_ WorkspacePartial模型）
＆LT; / DIV＆GT;
＆LT; DIV CLASS =栏目组ID =细节＆GT;
@ Html.Partial（_ DetailPartial模型）
＆LT; / DIV＆GT;
＆LT; /字段集＆GT;
＆LT; /表及GT;
下面是我的模型：
公共类HomePageModel
{
公众诠释FromStore {搞定;组; } //复制/移动交易的to部分
公众诠释ToStore {搞定;组; } //复制/移动的交易清单
公开名单＆LT; INT＆GT;详细信息{搞定;组; }
//真的是假的移动副本是
公共BOOL IsMove {搞定;组; } //当前消息
公众诠释ERR {搞定;组; }
公众诠释errField {搞定;组; }
公共字符串errMessage {搞定;组; }
默认HtmlHelpers行为（@ Html.HiddenFor等）是做出你所描述的。
即。在后您的视图模型的任何更改都付诸行动，你从后返回的视图中接收到的任何变化，但HTMLHELPERS上重新呈现时，previous后的值在precedence在改变视图模型值。
想修理在一个快速+肮脏的方式这个问题，清除ModelState.Clear（）返回从之前的HttpPost ActionMethod！
Having issues with the view state on a series of page views -- On the initial view of a page in Razor I am using Html.HiddenFor as follows:
@Html.HiddenFor(x => Model.err)
@Html.HiddenFor(x => Model.errField)
@Html.HiddenFor(x => Model.errMessage)
@Html.HiddenFor(x => Model.IsMove)
which seems to work fine. My hidden input tags contain the correct values. However when I submit the form [HTTPPost] and update the model in my controller action with..
model.err = transHelper.err;
model.errField = transHelper.errField;
model.errMessage = transHelper.errMessage;
return View(model);
The hidden fields do not seem to update, they contain the original values from the initial view. However When I use these fields in another context within the same razor view like this...
@*
this seems to not update correctly...
@Html.HiddenFor(x => Model.err)
@Html.HiddenFor(x => Model.errField)
@Html.HiddenFor(x => Model.errMessage)
@Html.HiddenFor(x => Model.IsMove)
*@
<input type="hidden" id="err" value="@Model.err" />
<input type="hidden" id="errField" value="@Model.errField" />
<input type="hidden" id="errMessage" value="@Model.errMessage" />
<input type="hidden" id="IsMove" value="@Model.IsMove" />
</div>
Then the input fields update correctly. I even created a View Helper to help debug, and in all cases, the Model seems to have correct data in HtmlHelper<TModel> -- I even returned the Model as return Json(model); and the data was fine.
At this point I am running with the work around, but does anybody know why @Html.HiddenFor is dirty.
Update: here is my controller actions
[HttpPost]
public ActionResult Index(HomePageModel model)
{
// process transaction
Transactionr transr = new Transactionr();
transr.Process(model);
model.err = transr.err;
model.errField = transr.errField;
model.errMessage = transr.errMessage;
return View(model);
}
Here is my view:
@model App.Models.HomePageModel
@{
ViewBag.Title = "Product Categorizer";
}
<form id="formData" method="post" action="/Home/Index">
@Html.AntiForgeryToken()
<fieldset>
<div>
@Html.HiddenFor(model => model.err)
@Html.HiddenFor(model => model.errField)
@Html.HiddenFor(model => model.errMessage)
@Html.HiddenFor(model => model.IsMove)
<input type="hidden" id="myerr" value="@Model.err" />
<input type="hidden" id="myerrField" value="@Model.errField" />
</div>
<div class="section group">
<div class="col span_2_of_2">
<div class="message" id ="message">
@if (Model.err < 0)
{
<span style="color: purple;">@Model.errMessage (@Model.err) - (@Model.errField)</span>
}
else if (Model.err > 0)
{
<span style="color:red;">@Model.errMessage (@Model.err) (@Model.errField)</span>
} else {
<span>@Model.errMessage (@Model.err) (@Model.errField)</span>
}
</div>
</div>
</div>
<div class="section group" id="workspace">
@Html.Partial("_WorkspacePartial", Model)
</div>
<div class="section group" id="details">
@Html.Partial("_DetailPartial", Model)
</div>
</fieldset>
</form>
Here is my model:
public class HomePageModel
{
public int FromStore { get; set; }
// the "To" part of the copy/move transaction
public int ToStore { get; set; }
// a list of the copy/move transaction
public List<int> Details { get; set; }
// true is move false is copy
public bool IsMove { get; set; }
// current message
public int err { get; set; }
public int errField { get; set; }
public string errMessage { get; set; }
The default HtmlHelpers behavior (@Html.HiddenFor, etc) is to behave exactly as you have described.
i.e. any changes you make to the ViewModel on a post are actioned, any changes you return from the Post are received by the view, but on re-rendering WITH HTMLHELPERS, the previous Post-values take precedence over the changed ViewModel values.
Want to "fix" this behavior in a quick + dirty way, clear the ModelState.Clear() prior to returning from the HttpPost ActionMethod !
这篇关于MVC 4 @ HTML.HiddenFor没有更新上回发的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
