无法确定如何从视图中的GroupBy循环中获取标头数据

我迷失了正确的语法，无法获得特定的模型项目，仅在Foreach分组循环中显示。从控制器的IEnumerable Model馈电。子循环和外部循环工作得很好，只是不能获得内部to头的值并定义每个内部循环值的Top

视图代码:

@model IEnumerable<eManager.Web2.Models.EventClassCompListVM>
<table class="table">

    <h2>
        @(Model.Any() ? Model.First().EventName : "")
        @(Model.Any() ? Model.First().EventDate.ToShortDateString() : "")
    </h2>
    @foreach (var group in Model.GroupBy(item => item.ClassName))
    {
        <tr>
            <td>
                @Html.DisplayNameFor(model => model.ClassName)
                @Html.DisplayFor(model => model.ClassName) //Generates an unknown exception
            </td>
        </tr>
        foreach (var item in group)
        {
            <tr>
                <td>
                    @Html.DisplayFor(modelItem => item.Comp_EventID)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.CompName)

ViewModel//由特定元素的4个模型组成

namespace eManager.Web2.Models
{
    public class EventClassCompListVM
    {
        public EventClassCompListVM()
    {
        this.ClassName = ClassName;
        this.CompName = CompName;
    }
        public int ECCLkey { get; set; }
        public int CompeditorId { get; set; }
        public int Comp_EventID { get; set; }
        public DateTime EventDate { get; set; }
        public int EventID { get; set; }
        public int ClassID { get; set; }
        public string CompName { get; set; }
        public string EventName { get; set; }
        public string CompMetricName { get; set; }
        public double CompMetric { get; set; }
        public int MaxComp { get; set; }
        public string ClassName { get; set; }
        public int ClassOrder { get; set; }
        public int EventClassID { get; set; }
        public bool IsCrossOver { get; set; }
        public int Event_Class_CompeditorsId {get; set; }
   }
}

控制器

public ActionResult BuildEventClassReports()
    {
        var model = (from o in _db.Events
                     join o2 in _db.Event_Classes on o.EventID equals o2.EventID
                     where o.EventID.Equals(o2.EventID)
                     join o3 in _db.Event_Class_Compeditors_s on o2.EventClassID equals o3.EventClassID
                     where o2.EventClassID.Equals(o3.EventClassID)
                     join o4 in _db.Compeditors on o3.CompeditorId equals o4.CompeditorId
                     where o3.CompeditorId.Equals(o4.CompeditorId)
                     join o5 in _db.Class_Definitions on o2.ClassID equals o5.Class_Definition_ID
                     where o2.ClassID.Equals(o5.Class_Definition_ID)
                     where o.CurrentEvent.Equals(true)
                     orderby o2.ClassOrder
                     //orderby o3.Comp_EventID
                     select new EventClassCompListVM
                     {
                         ClassID = o2.ClassID,
                         EventName = o.EventName,
                         EventDate = o.Date_End,
                         ClassName = o5.Class_Name,
                         Comp_EventID = o3.Comp_EventID,
                         ClassOrder = o2.ClassOrder,
                         CompName = (o4.FirstName + " " + o4.LastName),
                         IsCrossOver = o3.IsCrossOver
                     }).ToList();
        return View(model);
    }