我有一个表格,其中包含特定客户的事件注册列表。每行都有下拉列表,允许更改该行中给定事件的客户注册状态。但是,他们目前的状况并未列入清单;每个列表中都会选择第一个项目。在表格中设置每行下拉的初始值
视图模型:
public class EditRegistrationViewModel
{
public int SiteMemberId { get; set; }
public string Name { get; set; }
public List<EditParticipantViewModel> Participants { get; set; }
}
public class EditParticipantViewModel
{
public int ParticipantId { get; set; }
[Display(Name = "Event ID")]
public int EventId { get; set; }
[Display(Name = "Name")]
public string Name { get; set; }
[Display(Name = "Start Date")]
public string StartDateTime { get; set; }
[Display(Name = "Participation Status")]
public int SelectedParticipationStatus { get; set; }
public List<SelectListItem> ParticipationStatusList { get; set; }
}
视图(只是C#for循环块)
@for (int i = 0; i < Model.Participants.Count; i++)
{
<tr>
@Html.HiddenFor(m => m.Participants[i].ParticipantId)
<td class="text-right">@Model.Participants[i].EventId</td>
<td>@Model.Participants[i].Name</td>
<td>@Model.Participants[i].StartDateTime</td>
<td>@Html.DropDownListFor(
m => m.Participants[i].SelectedParticipationStatus,
Model.Participants[i].ParticipationStatusList,
new { @class = "form-control" })</td>
</tr>
}
控制器(填充的初始值,但下拉没有被设置为它)
foreach (var i in participantQuery)
{
EditParticipantViewModel theItem = new EditParticipantViewModel()
{
ParticipationStatusList = tblEnum.GetSelectListForConstraintId(CRConstants.PARTICIPATION_STATUS_CONSTRAINT_ID),
ParticipantId = i.a.aID,
EventId = i.c.aID,
Name = i.c.tName,
SelectedParticipationStatus = i.b.nParticipationStatus ?? 0
};
DateTime? startDate = i.d.GetStartDateTime();
theItem.StartDateTime = startDate.HasValue ? startDate.Value.ToString() : "-";
theViewModel.Participants.Add(theItem);
}
下面是获取选择列表的代码:
public static List<SelectListItem> GetSelectListForConstraintId(int constraintId)
{
CCSContext db = new CCSContext();
List<SelectListItem> theList = new List<SelectListItem>();
List<tblEnum> enumList = db.Enum.Where(x=>x.nConstraintID == constraintId).OrderBy(x=>x.nOrder).ToList();
foreach (var i in enumList)
{
SelectListItem theItem = new SelectListItem()
{
Text = i.tDisplayName,
Value = i.nIndex.ToString()
};
theList.Add(theItem);
}
return theList;
}
只要有一个在'SelectedParticipationStatus'价值,这应该work.Could您发布'GetSelectListForConstraintId'呢? – adiga
@adiga我已经添加了该方法。本质上,我只是循环访问数据库中的状态列表,从每个状态中创建一个selectlistitem,然后返回列表。 – benjsigmon
@adiga是的,这就是让我特别困惑的地方,因为我的代码中有其他地方可以做到这一点,只是不是每行都有下拉列表的列表。 – benjsigmon