我想在视图顶部显示计算属性的FullName。当我查看Autos日志时，我可以看到FullName属性。但是Html帮助程序中使用的lambda表达式只显示属性名称，而不显示数据。有什么方法可以显示日志显示的可用数据吗？
更新：
完整视图：
@model IEnumerable<SlamJammersData.Model.Attendances>
@{
ViewBag.Title = "Rosters";
}
<div class="container container-fluid">
<div class="panel panel-info">
<div class="panel-body">
<div class="container">
@using (Html.BeginForm("Index", "Attendances", FormMethod.Get))
{
<div class="row">
<div class="col-md-4">
<p>
<h3>Attendances for player: @Html.DisplayNameFor(model => model.FullName) </h3>
</p>
</div>
<div class="col-md-4">
<p>
<h4>Attendances Recorded: @Model.Count() </h4>
</p>
</div>
</div>
}
</div>
</div>
</div>
</div>
<div class="container">
<div class="row">
<div class="col-md-2">
<p>
@Html.DisplayNameFor(model => model.Type)
</p>
</div>
<div class="col-md-2">
<p>
@Html.DisplayNameFor(model => model.AttendanceDate)
</p>
</div>
<div class="col-md-2">
<p>
@Html.DisplayNameFor(model => model.Comments)
</p>
</div>
</div>
@foreach (var item in Model)
{
<div class="row table-striped">
<div class="col-md-2">
<p>
@Html.DisplayFor(modelItem => item.Type)
</p>
</div>
<div class="col-md-2">
<p>
@Html.DisplayFor(modelItem => item.AttendanceDate)
</p>
</div>
<div class="col-md-2">
<p>
@Html.DisplayFor(modelItem => item.Comments)
</p>
</div>
<div class="col-md-1">
<p>
<input class="btn btn-xs btn-info" type="button" value="Details" onclick=" location.href = '@Url.Action("Details", "Attendances", new {id = item.Id}, null)' "/>
</p>
</div>
<div class="col-md-1">
<p>
<input class="btn btn-xs btn-info" type="button" value="Edit" onclick=" location.href = '@Url.Action("Edit", "Attendances", new {id = item.Id}, null)' "/>
</p>
</div>
<div class="col-md-2">
<p>
<input class="btn btn-xs btn-success" type="button" value="Add New Attendance" onclick=" location.href = '@Url.Action("Create", "Attendances", new {enrollments_Attendance = item.Enrollments_Attendance}, null)' "/>
</p>
</div>
<div class="col-md-1">
<p>
<input class="btn btn-xs btn-danger" type="button" value="Delete" onclick=" location.href='@Url.Action("Delete", "Attendances", new {id = item.Id}, null)' " />
</p>
</div>
</div>
}
</div>
控制器：
public ActionResult Index(int? Id )
{
//Get the rosters and their attendance records
IQueryable<Attendances> attendances = db.Attendances
.Where(a => a.Enrollments_Attendance == Id)
.Include(e => e.Enrollments.Individuals)
.OrderByDescending(a => a.AttendanceDate);
ViewBag.EnrollmentId = Id;
var sql = attendances.ToString();
return View(attendances.ToList());
}
型号：
namespace SlamJammersData.Model
{
public class Attendances
{
public int Id { get; set; }
[Required]
[StringLength(15)]
public string Type { get; set; }
[DataType(DataType.Date)]
[DisplayFormat(DataFormatString = "{0:MM-dd-yyyy}", ApplyFormatInEditMode = true)]
public DateTime AttendanceDate { get; set; }
[StringLength(255)]
public string Comments { get; set; }
[Display(Name="Enrollments")]
public int Enrollments_Attendance { get; set; }
public virtual Enrollments Enrollments { get; set; }
[NotMapped]
public string FullName
{
get
{
var player = Enrollments.Individuals.FirstName + " " + Enrollments.Individuals.LastName;
return player;
}
}
}
}
我不确定它是否是IEnumerable，但以下是调试器中显示的内容：调试器的自动日志的屏幕截图
由于您的模型是IEnumerable<SlamJammersData.Model.Attendances>，而FullName是Attendances的属性，因此您不能像尝试的那样在foreach块之外使用FullName属性。但是，假设FullName的值始终相同，则可以使用ViewBag。更改您的控制器方法如下
public ActionResult Index(int? Id )
{
//Get the rosters and their attendance records
IQueryable<Attendances> attendances = db.Attendances
.Where(a => a.Enrollments_Attendance == Id)
.Include(e => e.Enrollments.Individuals)
.OrderByDescending(a => a.AttendanceDate);
ViewBag.EnrollmentId = Id;
ViewBag.FullName = ...; // logic to get FullName here
var sql = attendances.ToString();
return View(attendances.ToList());
}
并在您的视图中显示全名，如下
@using (Html.BeginForm("Index", "Attendances", FormMethod.Get))
{
<div class="row">
<div class="col-md-4">
<p>
<h3>Attendances for player: @ViewBag.FullName </h3>
</p>
</div>
<div class="col-md-4">
<p>
<h4>Attendances Recorded: @Model.Count() </h4>
</p>
</div>
</div>
}
我得到了ASP.NET论坛关于这个主题的帮助。所需的辅助代码行是：
<h3>Attendances for player: @Html.DisplayName(Model.First().FullName) </h3>
感谢所有看过这个问题的人。
更新：我发现了另一行代码，它可以工作，而且看起来更安全。
@Html.DisplayFor(m => m.ElementAt(0).FullName)
更新：我发现，正如Marko所评论的，如果记录计数为0，就会引发异常。所以我做了一个工作，在控制器中使用try-catch来显示一条更友好的消息，如果没有记录可以显示的话。
public ActionResult Index(int? Id)
{
//Get the rosters and their attendance records
IQueryable<Attendances> attendances = db.Attendances
.Where(a => a.Enrollments_Attendance == Id)
.Include(e => e.Enrollments.Individuals)
.OrderByDescending(a => a.AttendanceDate);
ViewBag.EnrollmentId = Id;
try
{
ViewBag.FullName = attendances.First().FullName;
}
catch (InvalidOperationException ex)
{
ViewBag.Exception = ex;
ViewBag.FullName = "No Attendances to display for the selected player";
}
return View(attendances.ToList());
}