Question

目前我正在尝试检查所选的项目ID，并在编辑页面的下拉列表中显示，该页面将显示上一个选定的项目。项目根据其活动状态显示。所有活动项目都显示在下拉列表中，如果用户的上一个选择选项当前处于非活动状态，则它仍应默认为下拉列表中的该项目，因为它是先前所做的选择。我的问题是我无法显示用户在编辑页面上选择的非活动项目。我将发布所有代码，这是在另一个链接中提出的问题的延续：passing null parameters

我在控制器中的代码：

private IEnumerable<SearchItems> GetItems(ItemDescriptionFormViewModel viewModel = null)
{
    if(viewModel == null)
      viewModel = new AppointmentViewModel();
    IOrderedQueryable<ItemDescription> items= _itemDescriptionRepository.FindAll().OrderBy(
        c => c.Sort == null).ThenBy(
            c => c.Sort).ThenBy(c => c.Description);

    if(items.Count()==0)
        ModelState.AddModelError("", string.Format("No active {0} entered.", Kids.Resources.Entities.ItemDescription.EntityNamePlural));
   return
        _itemDescriptionRepository.FindAll().OrderBy(c => c.Description).Where(a=>a.IsActive == true || a.ItemDescriptionId == viewModel.ItemDescriptionId).Select(
            c => new SearchItems {Text = c.Description, Value = c.ItemDescriptionId.ToString()});
}

我在CONTROLLER中的编辑方法：

[HttpGet]
    [AppointmentAuthorization]
    public ActionResult Edit(Guid appointmentId)
    {
        Appointment appointment = _appointmentService.Get(appointmentId);
        if (appointment == null) return View("NotFound");


        var viewModel = new AppointmentViewModel
                            {
                                AppointmentId = appointment.AppointmentId,

                            };
        viewModel.Items= GetItems();

        return this.RazorView("Edit", viewModel);
    }

似乎缺少某些东西并将viewModel作为参数传递给viewModel.Items = GetItems（）并没有做太多。我还有另一个用于Edit的Post方法和一个调用GetItems（）方法的Create方法。任何帮助都会很棒。谢谢：D

这就是我在ViewModel类中的内容：

public IEnumberable<SearchItems> Items {get; set;}
public Guid ItemDescriptionid {get; set;}

创建方法：

[HttpGet]
    [AppointmentAuthorization]
    public ActionResult Create(Guid caseId)
    {
        var viewModel = new AppointmentViewModel
                            {
                               Items= GetItems()
                            };

        return this.RazorView("Create", viewModel);
    }

***** SOLUTION *****

private IEnumerable<SearchItems> GetItems(Appointment appointment)
    {
        IEnumerable<short?> itemDescriptionIds =
            appointment.AppointmentItems.Where(c => c.ItemDescriptionId.HasValue).Select(
                c => c.ItemDescriptionId).Distinct();

        IOrderedQueryable<ItemDescription> itemDescription =
            _itemDescriptionRepository.FindAll().Where(
                a => a.IsActive == true || itemDescriptionIds.Contains(a.ItemDescriptionId)).OrderBy(
                    d => d.Description);

        return itemDescription.Select(c=> new SearchItems{Text = c.Description, Value = c.ItemDescriptionId.ToString()});
    }

Answer 1

您的初始代码未查询之前选择的值的原因是您的查询a.ItemDescriptionId == viewModel.ItemDescriptionId，比较项目描述ID，但在您的View模型中，您只设置了约会ID。如果您需要项目描述ID，请确保将其初始化。

var viewModel = new AppointmentViewModel
{
     AppointmentId = appointment.AppointmentId,
     ItemDescriptionId = appointment.ItemDescriptionId
};

建议的重构：

private IEnumerable<SearchItems> GetItems(Guid lastId = new Guid())
{
    IOrderedQueryable<ItemDescription> items= _itemDescriptionRepository.FindAll();

    if(!items.Any())
        ModelState.AddModelError("", string.Format("No active {0} entered.", Kids.Resources.Entities.ItemDescription.EntityNamePlural));

    return items
        .OrderBy(c => c.Description).Where(a=>a.IsActive == true || a.ItemDescriptionId == lastId)
        .Select(c => new SearchItems {Text = c.Description, Value = c.ItemDescriptionId.ToString()});
}

当你使用它时所有人都使用必要的Guid时，传递ViewModel是很愚蠢的。然后把它称为

viewModel.Items= GetItems(appointment.ItemDescriptionId);

如果你的查询仍然没有添加正确的项目，请尝试调试它。

var testExists = itemDescriptionRepository.FindAll().FirstOrDefault(a.ItemDescriptionId == lastId);

如果您没有找到它，并且您确定lastId设置正确，则可能是数据库问题。

检查列表项ID

1 个答案: