参数Null异常

Question

我正在使用下拉列表的车辆类型，其值将来自数据库，但是当我单击“创建”按钮时，我会得到

  

系统参数空引用异常。

我有三个模型类：VehicleInfo，Vehicle，Type

我尝试使用ViewBag和其他方法绑定模型数据。

@model TeslaCompany.Models.VehicleInfo
@{
   ViewBag.Title = "Create"; 
}

<h2>Create</h2>
@using (Html.BeginForm("Create","Vehicle",FormMethod.Post))  {
   @Html.AntiForgeryToken()

   <div class="form-horizontal">
       <h4>VehicleInfo</h4>
       <hr />
       @Html.ValidationSummary(true, "", new { @class = "text-danger" })
       <div class="form-group">
           @Html.LabelFor(model => model.VehicleId, htmlAttributes: new { @class = "control-label col-md-2" })
           <div class="col-md-10">
               @Html.DropDownList("Type",new SelectList(ViewBag.data,"TypeId","Type"))
             @* @Html.DropDownListFor(model=>model.vehicleList,new SelectList(Model.vehicleList,"TypeId","Type"),"Select")
              @@Html.DropDownListFor(model => model.VehicleId, (SelectList)ViewBag.MyGroups)*@ 
                @*@Html.ValidationMessageFor(model => model.vehicleList, "", new { @class = "text-danger" })*@


           </div>
       </div>

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

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

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

   @section Scripts {
       @Scripts.Render("~/bundles/jqueryval") 
   }