C# 无法确定如何从视图中的GroupBy循环中获取标题数据
我不知道如何使用正确的语法将特定的模型项显示在C# 无法确定如何从视图中的GroupBy循环中获取标题数据,c#,asp.net-mvc-4,C#,Asp.net Mvc 4,我不知道如何使用正确的语法将特定的模型项显示在Foreach分组循环中。从控制器馈送IEnumerable模型。。子循环和外部循环工作得很好,只是无法获取内部到页眉的值并定义每个内部循环的顶部值 查看代码: @model IEnumerable<eManager.Web2.Models.EventClassCompListVM> <table class="table"> <h2> @(Model.Any() ? Model.F
Foreach
分组循环中。从控制器馈送IEnumerable模型
。。子循环和外部循环工作得很好,只是无法获取内部到页眉的值并定义每个内部循环的顶部值
查看代码:
@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)
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);
}
@DisplayFor(g=>group.Key)
对于数据中标题为分组元素的一项非常有效
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);
}