View在Chrome中返回FormCollection，但不返回IE

Question

我有一个有DDL的View。在DDL中选择一个值后，可以提交表单，并从Web Api服务中检索供应商的项目并重新加载页面。此表单按照Chrome设计的方式工作，但无法在IE中的FormCollection对象中找到DDL值。我错过了什么？

查看代码

@using AMCWeb.Models
@model AppointsViewModel
@{
    ViewBag.Title = "Index";
}
<h2>Appraisal Appointment</h2>
@using (Html.BeginForm("GetAppointmentsByVendor", "AppraisalAppointment", FormMethod.Post, new {@id = "validationlist"}))
{
    <br/>
    <br/>

        @Html.DropDownListFor(model => model.SelectedCompany, new SelectList(Model.Vendors.OrderBy(s => s.Company), "Id", "Company", Model.SelectedCompany), "- Select Vendor -")
    <br/>
    <input type="submit" value="Get Appointments" onclick="location.href='@Url.Action("GetAppointmentsByVendor", "AppraisalAppointment")'" />
    <br/>
    <table>
        <tr>
            <th>Id</th>
            <th>Loan Number</th>
            <th>State</th>
            <th>Order Date</th>
            <th>Apt Date</th>
            <th>Est Due Date</th>
            <th>Fees</th>
            <th>MN Status</th>
        </tr>  

            @foreach (AMCWeb.Models.AppraisalAppointment appraisalAppointment in Model.Appraisals)
            {
                //...load the table with data
            }
    </table>
}

控制器代码

public ActionResult GetAppointmentsByVendor(FormCollection formValues)
{
   List<string> messages = new List<string>();
   if (formValues["selectedCompany"].Trim() == string.Empty)
   {
       messages.Add("You must select a Vendor to begin.");
       ViewBag.Messages = messages;
       appointments.Vendors = _vendorRepository.Get();
       return View("Index", appointments);
   }

   var vendorId = Convert.ToInt32(formValues["selectedCompany"]);
   appointments.Appraisals = _appraisalAppointmentRepository.GetByVendor(vendorId);
   appointments.Vendors = _vendorRepository.Get();
   appointments.SelectedCompany = vendorId;
   return View("Index", appointments);
} 

来自IE的价值：

Chrome的价值：

更新： 看来vendorId正在通过。当我逐步完成代码时发现我发现的事实是它确实不在FormCollection对象中，然后代码突破了第一个＆if; if语句＆＃39;因为它不在集合中，但是如果我继续单步执行代码，它会向右跳回第一行var vendorId = Convert.ToInt32(formValues["selectedCompany"]);并且值就在那里。所以我修改了代码如下

public ActionResult GetAppointmentsByVendor(FormCollection formValues)
{
    // to set up the model for reload
    IEnumerable<AppraisalAppointment> appointment = new[] { new AppraisalAppointment() };
    appointments.Appraisals = appointment;
    appointments.Vendors = _vendorRepository.Get();

    // for use in the tryparse
    var selectedCompany = formValues["selectedCompany"];
    int vendorId;

    // for message deliver to the user
    List<string> messages = new List<string>();

    // if the vendorId is not an int then they didn't select one return
    if (!Int32.TryParse(selectedCompany, out vendorId))
    {
        appointments.SelectedCompany = 0;
        messages.Add("You must select a Vendor to begin.");
        ViewBag.Messages = messages;
        return View("Index", appointments);
    }

    // get the data for the user
    appointments.Appraisals = _appraisalAppointmentRepository.GetByVendor(vendorId);
    appointments.SelectedCompany = vendorId;
    return View("Index", appointments);
}