使用AJAX提交部分页面时出错

最近，我经常在开发中遇到错误，但在生产中却没有，这就是其中一个。当使用AJAX提交部分页面时，我得到了错误"500内部服务器错误"． Firebug捕获的细节:

异常细节

控制器:TimeKeeper
动作:编辑
消息:没有类型为'IEnumerable'的ViewData项它的键为'StateID'
StackTrace:

Exception: at System.Web.Mvc.Html.SelectExtensions。GetSelectData(HtmlHelper, HtmlHelper，字符串名称)在System.Web.Mvc.Html.SelectExtensions。SelectInternal(HtmlHelper, HtmlHelper, ModelMetadata, metadata, String optionLabel, String name, IEnumerable ' 1 selectList, Boolean allowMultiple, IDictionary ' 2 htmlAttributes)在System.Web.Mvc.Html.SelectExtensions。下拉列表(HtmlHelper, HtmlHelper，字符串名称，IEnumerable ' 1选择列表，字符串optionLabel，对象htmlAttributes)at asp . _page_views_timekeeper _edit_cshtml . execute () in c:'inetpub'wwwroot'[appname]'Views'TimeKeeper'_Edit。cshtml: 64行在System.Web.WebPages.WebPageBase.ExecutePageHierarchy ()在System.Web.Mvc.WebViewPage.ExecutePageHierarchy ()在System.Web.WebPages.WebPageBase。ExecutePageHierarchy(WebPageContext, pageContext, TextWriter, WebPageRenderingBase)在System.Web.Mvc.RazorView。RenderView(ViewContext, ViewContext, TextWriter, Object实例)在System.Web.Mvc.BuildManagerCompiledView。渲染(ViewContext, ViewContext, TextWriter)在System.Web.Mvc.ViewResultBase。ExecuteResult (ControllerContext上下文)在System.Web.Mvc.ControllerActionInvoker。InvokeActionResult(ControllerContext ControllerContext, ActionResult ActionResult)在System.Web.Mvc.ControllerActionInvoker。InvokeActionResultFilterRecursive(IList ' 1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext, ControllerContext, ActionResult ActionResult)在System.Web.Mvc.ControllerActionInvoker。InvokeActionResultFilterRecursive(IList ' 1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext, ControllerContext, ActionResult ActionResult)在System.Web.Mvc.ControllerActionInvoker。InvokeActionResultWithFilters(ControllerContext, ControllerContext, IList ' 1 filters, ActionResult ActionResult),在System.Web.Mvc.Async.AsyncControllerActionInvoker。你们的在c__DisplayClass21灵活;祝辞c__DisplayClass2b灵活;BeginInvokeAction> b__1c ()at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass21.b__1e(IAsyncResult asyncResult)

_Edit。cshtml(部分):

@model appname.ViewModels.TimeKeeperEditViewModel
<link href="@Url.Content("~/Content/datepicker.css")" rel="stylesheet" type="text/css" />
<link href="@Url.Content("~/Content/datepicker3.css")" rel="stylesheet" type="text/css" />
<div class="modal-header">
    <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
    <h4 class="modal-title" id="myModalLabel">Edit Time Keeper</h4>
</div>
@using (Ajax.BeginForm("Edit", "TimeKeeper",
    new AjaxOptions
    {
        InsertionMode = InsertionMode.Replace,
        HttpMethod = "POST",
        OnComplete = "editTimeKeeperComplete",
        UpdateTargetId = "timeKeeperList"
    }))
{
    @Html.ValidationSummary(true)
    @Html.HiddenFor(model => model.TimeKeeperID)
    @Html.HiddenFor(model => model.BillingID)
    <div class="modal-body">
        <div class="form-horizontal">
            <div class="form-group">
                <div class="col-md-4">
                    <label for="billingRate" class="control-label">Billing Rate</label>
                </div>
                <div class="col-md-8">
                    @Html.EditorFor(model => model.BillingRate, new { htmlAttributes = new { @class = "form-control" } })
                </div>
            </div>
            <div class="form-group">
                <div class="col-md-4">
                    <label for="billingStartDate" class="control-label">Billing Start Date</label>
                </div>
                <div class="col-md-8">
                    @Html.EditorFor(model => model.BillingStartDate, new { htmlAttributes = new { @class = "form-control", @readonly = "readonly" } })
                </div>
            </div>
            <div class="form-group">
                <div class="col-md-4">
                    <label for="status" class="control-label">Status</label>
                </div>
                <div class="col-md-8">
                    @Html.DropDownList("StateID", null, String.Empty, new { @class = "form-control" })
                </div>
            </div>
        </div>
    </div>
    <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal" id="btnClose">Close</button>
        <button type="submit" class="btn btn-primary" id="btnSave">Save changes</button>
    </div>
}
<script type="text/javascript">
    $(document).ready(function () {
        $("#BillingStartDate").datepicker({
            format: "dd/mm/yyyy",
            todayBtn: "linked",
            autoclose: true,
            todayHighlight: true
        });
    });
</script>

填充StateID的代码:

private void PopulateStateDropDownList(object selectedState = null)
        {
            var statesQuery = from s in db.States
                              where s.RowStatus == true && s.StateGroupID == 1
                              orderby s.Name
                              select new
                              {
                                  StateID = s.StateID,
                                  Name = s.Name
                              };
            ViewBag.StateID = new SelectList(statesQuery, "StateID", "Name", selectedState);
        }

Post action code:

[HttpPost]
        public ActionResult Edit(TimeKeeperEditViewModel timeKeeperEditVM)
        {
            try
            {
                if (ModelState.IsValid)
                {
                    LogHelper.logger.Info("Model Valid");
                    TimeKeeper timeKeeper = db.TimeKeepers.Find(timeKeeperEditVM.TimeKeeperID);
                    timeKeeper.BillingRate = timeKeeperEditVM.BillingRate;
                    timeKeeper.BillingStartDate = timeKeeperEditVM.BillingStartDate;
                    timeKeeper.BillingEndDate = timeKeeperEditVM.BillingEndDate;
                    timeKeeper.StateID = timeKeeperEditVM.StateID;
                    LogHelper.logger.Info("Save");
                    db.Entry(timeKeeper).State = EntityState.Modified;
                    db.SaveChanges();
                    LogHelper.logger.Info("Get Timekeepers");
                    Billing billing = db.Billings.Find(timeKeeperEditVM.BillingID);
                    BillingTimeKeeperViewModel billingVM = new BillingTimeKeeperViewModel()
                    {
                        BillingID = billing.BillingID,
                        TimeKeepers = billing.TimeKeepers
                    };
                    LogHelper.logger.Info("Return");
                    return PartialView("_List", billingVM.TimeKeepers);
                }
                else
                {
                    LogHelper.logger.Info("Model is not Valid");
                    return PartialView("_Edit");
                }
            }
            catch (Exception ex)
            {
                LogHelper.logger.Error(ex);
                return RedirectToAction("Index", "Error", ex);
            }
        }

我正在使用NLog查看问题。没有错误，但是ModelState.IsValid为假

我将log放在if (ModelState.IsValid)之前，以打印出BillingRate, BillingStartDate, BillingEndDate和StateID。这是由于BillingEndDate是空的，如果我填写日期超过12，例如13/1/2014，但如果我填写12/1/2014 ModelState.IsValid是真的。

所以我的结论，这是由日期格式引起的。问题是我禁止更改服务器日期格式。任何建议吗?

public List<SelectListItem> StateList { get; set; }

foreach(var temp in statesQuery){
    model.StateList.Add(new SelectListItem() { Text = temp.Name, Value = temp.StateID });
}

@Html.DropDownListFor(x => x.StateID, Model.StateList)