I don't know why I get this kind of error. It happens sometimes, and I suspicious of my code that still have thread running while I close my Application. So when I open again it happens.
Value cannot be null.
Parameter name: source
StackTree :
???at System.Linq.Enumerable.Where[TSource](IEnumerable`1 source, Func`2 predicate)
???at Susenas2015.ViewModels.Kuesioner.VMVsen15_KVal.SettingValidationAndRange(List`1 listTextBox, List`1 listCheckBox, TabControl tabControl) in d:handitaOfficeProjectSusenas 2015Aplikasi Template SurveiSusenas2015ViewModelsKuesionerVMVsen15_KVal.cs:line 430
???at Susenas2015.ViewModels.Kuesioner.VMVsen15_KVal.vSen15_K_Loaded(Object sender, RoutedEventArgs e) in d:handitaOfficeProjectSusenas 2015Aplikasi Template SurveiSusenas2015ViewModelsKuesionerVMVsen15_KVal.cs:line 846
???at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
???at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
???at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
???at System.Windows.UIElement.RaiseEvent(RoutedEventArgs e)
???at System.Windows.BroadcastEventHelper.BroadcastEvent(DependencyObject root, RoutedEvent routedEvent)
???at System.Windows.BroadcastEventHelper.BroadcastLoadedEvent(Object root)
???at MS.Internal.LoadedOrUnloadedOperation.DoWork()
???at System.Windows.Media.MediaContext.FireLoadedPendingCallbacks()
???at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
???at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
???at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)
???at System.Windows.Media.MediaContext.Resize(ICompositionTarget resizedCompositionTarget)
???at System.Windows.Interop.HwndTarget.OnResize()
???at System.Windows.Interop.HwndTarget.HandleMessage(WindowMessage msg, IntPtr wpa`
My code here it is
private void SettingValidationAndRange(List<TextBox> listTextBox, List<CheckBox> listCheckBox, TabControl tabControl)
{
List<string> listNotDeclare = new List<string>();
foreach (var textB in listTextBox)
{
if (textB.Tag != null)
break;
Metadata metadata = ListMetadataKor.Where(
x => "text" + x.Field == textB.Name // this line 430
).FirstOrDefault();
if (metadata == null)
{
if (!string.IsNullOrEmpty(textB.Name))
listNotDeclare.Add(textB.Name);
}
else
{
metadata.TabControl = tabControl;
textB.Tag = metadata;
}
textB.AddEvents();
textB.AutomateFocus();
}
if (listNotDeclare.Count > 0)
{
Clipboard.SetText(string.Join(",", listNotDeclare.ToArray()));
Dialog.Info("Ada beberapa Metadata tidak ditemukan data sudah dicopy ke clipboard");
}
}
When I start my application for my first time, it doesn't get any error. It happens when I open in 2nd or more. And if I open my application it would stuck in that code.
How I can solve this? I'm pretty sure that my Property ListMetadataKor is not null
And ListMetadataKor is instance of List<Metadata> object that I have created. It happens only in rare cases. And I don't know to solve it
UPDATE
This is my code in image
I fill ListMetadataKor with this code
BWHelper.Run((s, e) =>
{
DataTable dataMetaDataKOR = ExcelHelper.GetDataTableFromExcel(
AppConstants.FILE_METADATA, AppConstants.SHEET_METADATA_KOR
);
DataTable dataKonsistensiKOR = ExcelHelper.GetDataTableFromExcel(
AppConstants.FILE_METADATA, AppConstants.SHEET_KONSISTENSI_KOR
);
listKonsistensiKor = Tools.ToolConvert.GetKonsistensi(dataKonsistensiKOR);
listMetadataKor = Tools.ToolConvert.GetMetadata(dataMetaDataKOR);
foreach (Metadata metadata in listMetadataKor)
{
metadata.Range.ProsesRange();
}
}, (s, e) =>
{
try
{
kor = new VSEN15_K() { Title = "Validasi Susenas - KOR" };
kor.DataContext = new VMVsen15_KVal(rtSusenas.MasterRT, kor, this, listKonsistensiKor, listMetadataKor);
kor.PreviewKeyDown += EventsCollection.EnterAsTabPreviewKeyDown;
vmHome.HideLoading();
UpdateMetaDataEntriKOR(RTSusenas.MasterRT);
kor.ShowDialog();
}
catch (Exception Ex)
{
vmHome.HideLoading();
Dialog.Error(Ex);
}
});
And then I throw the variable through constructor of my class
public VMVsen15_KVal(
MasterRT masterRT,
VSEN15_K vSen15_K,
IDaftarSusenas vmDaftarRTSusenas,
List<Konsistensi> listKonsistensiKor,
List<Metadata> listMetadataKor
)
{
ListArtDetail = new ObservableCollection<ARTDetailVal>();
this.ListKonsistensiKor = listKonsistensiKor;
this.ListMetadataKor = listMetadataKor;
My tools konsistensi like this
public static List<Konsistensi> GetKonsistensi(DataTable dataTable)
{
List<Konsistensi> listMetadata = new List<Konsistensi>();
for (int i = 0; i < dataTable.Rows.Count; i++)
{
Konsistensi k = new Konsistensi();
object[] required = new object[] { DBNull.Value, "" };
k.Field = dataTable.Rows[i][FIELD].ToString();
if (string.IsNullOrWhiteSpace(k.Field)) continue;
k.Message = dataTable.Rows[i][MESSAGE].ToString();
var obj = dataTable.Rows[i][ORDER];
k.Order = !required.Contains(dataTable.Rows[i][ORDER]) ? Convert.ToInt32(dataTable.Rows[i][ORDER]) : (int?)null;
k.Page = !required.Contains(dataTable.Rows[i][PAGE]) ? Convert.ToInt32(dataTable.Rows[i][PAGE]) : (int?)null;
k.Perlakuan = dataTable.Rows[i][PERLAKUAN].ToString();
k.RelFields = dataTable.Rows[i][RELFIELDS].ToString();
k.Rule = dataTable.Rows[i][RULE].ToString();
if (dataTable.Rows[i][LEVEL].ToString().ToUpper() == ("ART"))
k.LevelKonsistensi = LevelKonsistensi.ART;
else if (dataTable.Rows[i][LEVEL].ToString().ToUpper() == ("RT"))
k.LevelKonsistensi = LevelKonsistensi.RT;
else if (dataTable.Rows[i][LEVEL].ToString().ToUpper() == ("RTWARNING"))
k.LevelKonsistensi = LevelKonsistensi.RTWarning;
else if (dataTable.Rows[i][LEVEL].ToString().ToUpper().Contains("ARTWARNING"))
k.LevelKonsistensi = LevelKonsistensi.ARTWarning;
else
k.LevelKonsistensi = LevelKonsistensi.Lain;
//k.LevelKonsistensi = dataTable.Rows[i][LEVEL].ToString().Contains("ART") ? LevelKonsistensi.ART : LevelKonsistensi.RT;
if (k.IsEmpty())
continue;
listMetadata.Add(k);
}
return listMetadata;
}
