Question

我已经坚持了将近2天，我一直在尝试解决问题，但似乎无法获得所需的数据。

我是ASP.NET的新手。每当我单击某个事件的详细信息（链接）时，我都希望让某个事件的所有与会者参加。

我认为我的逻辑正确，但是似乎无法用代码编写。

这是我的details.cshtml文件：

@model MVCUML.Models.Registration

@{
    ViewBag.Title = "Details";
}

<h2>Details</h2>

<div>
<h4>Registration</h4>
<hr />
@Html.DisplayForModel(Model.Events.EventName)
<table>
    @foreach (var item in Model)
    {
        <tr>
            <td>@Html.DisplayForModel(Model.Attendees.Name) </td>
        </tr>
    }
</table>
</div>
<p>
@Html.ActionLink("Back to List", "Index")
</p>

这是我的注册/详细信息控制者：

public ActionResult Details(int? id)
{
        if (id == null)
        {
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        }

        Registration registration = db.Registrations.Find(id);

        if (registration == null)
        {
            return HttpNotFound();
        }

        return View(registration);
}

namespace MVCUML.Models
{
    public class Registration
    {
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int Id { get; set; }

        [Required]
        public int EventId { get; set; }

        [Required]
        public int AttendeeId { get; set; }

        public virtual Event Events { get; set; }
        public virtual Attendee Attendees { get; set; }
    }
}

public class Event
{
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }

    [Required]
    [Display(Name = "Event Name")]
    public string EventName { get; set; }

    [Required]
    public string Location { get; set; }

    [Required]
    [Display(Name = "Event Date")]
    [DataType(DataType.Date)]
    [DisplayFormat(DataFormatString = "{0:dd/MM/yyyy}")]
    public DateTime EventDate { get; set; }

    [Required]
    [DisplayFormat(DataFormatString = "{0:C}")]
    public Decimal Fee { get; set; }

    public virtual ICollection<EventAssignment> EventAssignments { get; set; }
    public virtual ICollection<Registration> Registrations { get; set; }
}

public class Attendee
{
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }

    [Required]
    [Display(Name = "First Name")]
    public string FName { get; set; }

    [Required]
    [Display(Name = "Last Name")]
    public string LName { get; set; }

    public string Name
    {
        get { return string.Format("{0} {1}", this.FName, this.LName); }
    }

    [Required]
    [EmailAddress]
    public string Email { get; set; }

    [Required]
    [Phone]
    public string Phone { get; set; }

    public virtual ICollection<Registration> Registrations { get; set; }
}

public class RegistrationIndexData
{
    public IEnumerable<Event> Events { get; set; }
    public IEnumerable<Attendee> Attendees { get; set; }
    public IEnumerable<Registration> Registrations { get; set; }
}

Answer 1

用以下代码替换您的foreach循环代码，然后尝试一下：

<table>
     @foreach (var evtReg in Model.Events.Registrations)
            {
                <tr>
                    <td>@evtReg.Attendees.Name </td>
                </tr>
            }
  </table>

此外，我建议将Events和Attendees重命名为诸如Event类的Attendee和Registration属性之类的单数名称，因为这些属性保留在object和不是对象列表

Answer 2

我想我明白了！需要对代码进行一些调整

代替此

<td>@Html.DisplayForModel(evtReg.Attendees.Name) </td>

我将其更改为：

<td>@evtReg.Attendee.Name</td>

它就像一个魅力。非常感谢！

从联合注册模型中选择事件数据时，检索所有与会者数据

2 个答案: