我有以下視圖模型：
public class DayTaskListViewModel
{
public int Id { get; set; }
public string DateFormatted { get; set; }
public bool HasRegistrations { get; set; }
public bool HasStartedRegistrations { get; set; }
public string ItemName { get; set; }
public string WorkTypeName { get; set; }
public string Description { get; set; }
public string LocationName { get; set; }
public bool IsActive { get; set; }
public string UserName { get; set; }
public string StateStatus { get; set; }
public DateTime TodaysDate { get; set; }
public int WeekNumber { get; set; }
public int YearNumber { get; set; }
public string Msg { get; set; }
public string SignInUserName { get; set; }
public string UnitCode { get; set; }
public IEnumerable<Machinery> machineryList { get; set; }
public IEnumerable<Cleaning> cleaningList { get; set; }
}
在我的控制器中，我定義了要發送到視圖的模型：
var model = (from a in _db.WorkTask.Where(y => y.TaskDate.Date == querytodaysDate.Date && y.IsActive == true && (y.IsPrivateUserName == null || y.IsPrivateUserName == currUserName))
join b in _db.WorkTaskLog.Where(x => (x.UserName == currUserName || x.UserName == null) && x.IsActive == true && x.StateStatusId < 4) on a.Id equals b.WorkTaskId into joinedT
from c in joinedT.DefaultIfEmpty()
select new DayTaskListViewModel
{
Id = a.Id,
DateFormatted = a.DateFormatted,
HasRegistrations = a.HasRegistrations,
HasStartedRegistrations = a.HasStartedRegistrations,
ItemName = a.ItemName,
WorkTypeName = a.WorkTypeName,
Description = a.Description,
IsActive = c.IsActive ? c.IsActive : false,
UserName = c.UserName ?? String.Empty,
StateStatus = c.StateStatus ?? "Klar",
WeekNumber = (int)currWeekNo,
YearNumber = (int)currYearNo,
Msg = "",
TodaysDate = (DateTime)todaysDate,
SignInUserName = currUserName,
LocationName = a.LocationName,
UnitCode = a.UnitCode,
//machineryList = _db.Machinery.ToList(),
//cleaningList = _db.Cleaning.ToList(),
}).ToList();
我的問題是定義中的以下幾行：//machineryList = _db.Machinery.ToList(), //cleaningList = _db.Cleaning.ToList(),
一切都按預期作業，但是一旦我啟用那 2 行，它就會因空錯誤而中斷。VS 可以編譯，但會破壞運行時。
我想我看到了問題，但我不知道如何解決它。我希望 ViewModel 中的所有欄位除了提到的 2 行是一個串列，然后 2 行是獨立于大多數的單獨串列。我已經嘗試了移動這些線的所有組合，但是 VS 抱怨。
另一個控制器的一個例子是這樣的：
DriveListViewModel model = new DriveListViewModel()
{
Drive = await _db.Drive
.Where(m => m.StatusId == 5 || m.StatusId == 1010 || m.StatusId == 1012)
.Where(m => m.LoadingComplete == null)
.Where(m => !m.UnitCode.Contains(excludeString))
.Include(s => s.DriveStatus)
.Include(d => d.Location)
.Include(f => f.Item)
.GroupBy(m => m.RegistrationNumber)
.Select(m => m.FirstOrDefault())
.OrderBy(m => m.DriverToLoad)
.ToListAsync(),
machineryList = await _db.Machinery.ToListAsync(),
cleaningList = await _db.Cleaning.ToListAsync(),
};
這很完美，但前一個模型定義更復雜，所以基本上，我需要類似于后一個示例的東西，將 2 個串列與 ViewModel 中的其他屬性分開。也許這很簡單 - 但是我正在努力解決它......
有人看到這個問題的解決方案嗎？
uj5u.com熱心網友回復：
我不認為你的模型是一個包含這么多包含的串列。
我猜你真的需要這個 ViewModel
public class ViewModel
{
public List<DayTaskListViewModel> DayTaskListViewModelList {get; set;}
public List<Machinery> MachineryList {get; set;}
public List<Cleaning> CleaningList {get; set;}
}
代碼
var dayTaskListViewModel= (from ....
.....
select new DayTaskListViewModel
{
Id = a.Id,
.......
}).ToList(); // or ToListAsync too?
var model = new ViewModel
{
DayTaskListViewModel = dayTaskListViewModel,
MachineryList = _db.Machinery.ToList(),
CleaningList = _db.Cleaning.ToList()
}
// or if you can or prefer , use async
MachineryList = await _db.Machinery.ToListAsync(),
CleaningList = await _db.Cleaning.ToListAsync(),
uj5u.com熱心網友回復：
嘗試了您的最新建議，但隨后 VS 抱怨：
var model = (from a in _db.WorkTask.Where(y => y.TaskDate.Date == querytodaysDate.Date && y.IsActive == true && (y.IsPrivateUserName == null || y.IsPrivateUserName == currUserName))
join b in _db.WorkTaskLog.Where(x => (x.UserName == currUserName || x.UserName == null) && x.IsActive == true && x.StateStatusId < 4) on a.Id equals b.WorkTaskId into joinedT
from c in joinedT.DefaultIfEmpty()
select new DayTaskListViewModel
{
Id = a.Id,
DateFormatted = a.DateFormatted,
HasRegistrations = a.HasRegistrations,
HasStartedRegistrations = a.HasStartedRegistrations,
ItemName = a.ItemName,
WorkTypeName = a.WorkTypeName,
Description = a.Description,
IsActive = c.IsActive ? c.IsActive : false,
UserName = c.UserName ?? String.Empty,
StateStatus = c.StateStatus ?? "Klar",
WeekNumber = (int)currWeekNo,
YearNumber = (int)currYearNo,
Msg = "",
TodaysDate = (DateTime)todaysDate,
SignInUserName = currUserName,
LocationName = a.LocationName,
UnitCode = a.UnitCode,
}).ToList();
model.machineryList = _db.Machinery.ToList();
model.cleaningList = _db.Cleaning.ToList();
“model”后面的“machineryList”和“cleaningList”。上面我在VS中用紅色標記，錯誤是：
List<DayTaskListViewModel> does not contain a definition for machineryList and no accessable extension method...
uj5u.com熱心網友回復：
這是視圖的片段：
最佳：
@model List<Day.Models.ViewModels.DayTaskListViewModel>
@using Day.Extensions
回圈遍歷所有屬性：
if (Model.Count > 0)
{
foreach (var item in Model)
{
<input name="description" class="form-input" id="description" type="text" value="@item.Description">
..Several input fields...
}
}
作業正常。
然后我需要使用 ViewModel 中的 MachineryList 包含選擇欄位：
<select name="machinery" asp-items="@Model.machineryList.ToSelectListItem((int)defaultMachinery)"></select>
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