在C中创建错误＃

-1

我是一名学生，对C＃编程仍然很陌生。目前，我正在使用MVC做一个项目，并且它有一个时间表页面。我需要创建一个时间表，但这里是错误发生的地方。我有一个日期选择器功能，如果在创建之后的4天内选择任何东西，我可以创建，但如果我选择其他时间，则无法创建。在C中创建错误＃

错误：值不能为空。参数：源

我的日程表创建页面

@model Sec.Models.Schedule 
@using Sec.Models 
@{ 
ViewBag.Title = "Create"; 
Layout = "~/Views/Shared/_LayoutPage.cshtml"; 
Employee currentEmp = null; 
if (ViewBag.emp != null) 
{ 
    currentEmp = (Employee)ViewBag.emp; 
} 
//Employee List 
List<Employee> dbsEmployee = ViewBag.Employee; 
List<SelectListItem> lstEmployee = 
    (from b in dbsEmployee 
    orderby b.Id 
    select new SelectListItem() 
    { Text = b.Name, Value = b.Id.ToString() }).ToList<SelectListItem>(); 
lstEmployee.Insert(0, new SelectListItem() { Text = "-- Select --", Value = "" }); 
//Site List 
List<Site> dbsSite = ViewBag.Site; 
List<SelectListItem> lstsite = 
    (from b in dbsSite 
    orderby b.Id 
    select new SelectListItem() 
    { Text = b.Id.ToString() + " -- " + b.Pod + b.Level + b.Gender, Value = b.Id.ToString() }).ToList<SelectListItem>(); 
lstsite.Insert(0, new SelectListItem() { Text = "-- Select --", Value = "" }); 

} 
@if ((currentEmp != null) && (currentEmp.isAdmin == true)) 
{ 
<script> 
    $('#datetimepicker1').data("DateTimePicker").FUNCTION() 

</script> 

<h2>Create</h2> 

using (Html.BeginForm()) 
{ 
    @Html.AntiForgeryToken() 

    <div class="form-horizontal"> 
     <h4>Schedule</h4> 
     <hr /> 
     @Html.ValidationSummary(true, "", new { @class = "text-danger" }) 

     <div class="form-group"> 
      @Html.LabelFor(model => model.Id, htmlAttributes: new { @class = "control-label col-md-2" }) 
      <div class="col-md-10"> 
       @Html.EditorFor(model => model.Id, new { htmlAttributes = new { @class = "form-control" } }) 
       @Html.ValidationMessageFor(model => model.Id, "", new { @class = "text-danger" }) 
      </div> 
     </div> 

     <div class="form-group"> 
      @Html.LabelFor(model => model.Employee_Id, "Employee_Id", htmlAttributes: new { @class = "control-label col-md-2" }) 
      <div class="col-md-10"> 
       @Html.DropDownList("Employee_Id", lstEmployee, htmlAttributes: new { @id = "DrpEmployeeId", @class = "form-control" }) 
       @Html.ValidationMessageFor(model => model.Employee_Id, "", new { @class = "text-danger" }) 
      </div> 
     </div> 
     <div class="form-group"> 
      @Html.LabelFor(model => model.Site_Id, "Site_Id", htmlAttributes: new { @class = "control-label col-md-2" }) 
      <div class="col-md-10"> 
       @Html.DropDownList("Site_Id", lstsite, htmlAttributes: new { @id = "DrpSiteId", @class = "form-control" }) 
       @Html.ValidationMessageFor(model => model.Site_Id, "", new { @class = "text-danger" }) 
      </div> 
     </div> 

     <div class="form-group"> 
      @Html.LabelFor(model => model.Date, htmlAttributes: new { @class = "control-label col-md-2" }) 
      <div class="row"> 
       <div class='col-sm-6'> 
        <div class='input-group date' id='datetimepicker1'> 
         @Html.TextBoxFor(model => model.Date, new { @class = "form-control datepicker", placeholder = "Press the button to enter date and time" }) 
         @Html.ValidationMessageFor(model => model.Date) 
         <span class="input-group-addon"> 
          <span class="glyphicon glyphicon-calendar"></span> 
         </span> 
        </div> 
       </div> 
       <script type="text/javascript"> 
        $(function() { 
         $('#datetimepicker1').datetimepicker(); 
        }); 
       </script> 
      </div> 
     </div> 

     <div class="form-group"> 
      <div class="col-md-offset-2 col-md-10"> 
       <input type="submit" value="Create" class="btn btn-default" /> 
      </div> 
     </div> 
    </div> 
} 

<div> 
    @Html.ActionLink("Back to List", "Index") 
</div> 
}

我的后端

using (secDBEntities3 dbc = new secDBEntities3()) 
       { 
        DbSet<Employee> dbe = dbc.Employees; 
        ViewBag.Employee = dbe.ToList(); 
        DbSet<Site> dbs = dbc.Sites; 
        ViewBag.Site = dbs.ToList(); 
       } 
       return View();

HTTP POST

public ActionResult Create([Bind(Include = "Id,Site_Id,Employee_Id,Date")] Schedule schedule) 
    { 
     if (ModelState.IsValid) 
     { 
      var s = db.Schedules.Create(); 
      s.Id = schedule.Id; 
      s.Site_Id = schedule.Site_Id; 
      s.Employee_Id = schedule.Employee_Id; 
      s.Date = schedule.Date; 
      db.Schedules.Add(schedule); 
      db.SaveChanges(); 
      return RedirectToAction("Index"); 
     } 

     return View(schedule); 
    }

堆栈跟踪

[ArgumentNullException: Value cannot be null. 
Parameter name: source] 
    System.Linq.OrderedEnumerable`2..ctor(IEnumerable`1 source, Func`2 keySelector, IComparer`1 comparer, Boolean descending) +4367342 
    System.Linq.Enumerable.OrderBy(IEnumerable`1 source, Func`2 keySelector) +62 
    ASP._Page_Views_Schedules_Create_cshtml.Execute() in D:\Jncr\Jncrwa\Jncrwa\Views\Schedules\Create.cshtml:13 
    System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +198 
    System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +105 
    System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +78 
    System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) +235 
    System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) +107 
    System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +291 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) +13 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +56 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +52 
    System.Web.Mvc.Async.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() +173 
    System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +100 
    System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +10 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +27 
    System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +13 
    System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +29 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +36 
    System.Web.Mvc.Controller.<BeginExecute>b__15(IAsyncResult asyncResult, Controller controller) +12 
    System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +22 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +26 
    System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +10 
    System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +21 
    System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +29 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +28 
    System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9 
    System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9744261 
    System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155