admin/LehrerApp
1
0
Fork 0
Code Issues Pull Requests Actions 5 Packages Projects Releases Wiki Activity

Fix BindingError bei Group.IsDifferentiated in GroupDetailView

Browse Source 
Group ist beim ersten Binden der View noch null (LoadGroup läuft erst
danach), wodurch der verschachtelte Pfad "Group.IsDifferentiated" bei
jeder Navigation einen Binding-Fehler loggte. Stattdessen jetzt eine
eigene IsDifferentiated-Property auf GroupDetailViewModel.
This commit is contained in:
admin
2026-08-12 14:19:02 +02:00
parent 182c386cc5
commit ebfb58f1a4
2 changed files with 9 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
LehrerApp.Desktop/ViewModels/Groups/GroupViewModels.cs
+7
View File
@@ -167,6 +167,13 @@ public partial class GroupDetailViewModel : ObservableObject
[ObservableProperty] private StudentSummary? _selectedStudent; [ObservableProperty] private StudentSummary? _selectedStudent;
[ObservableProperty] private ExamSummary? _selectedExam; [ObservableProperty] private ExamSummary? _selectedExam;
// Eigene Property statt "Group.IsDifferentiated" im Binding-Pfad: die View bindet bereits,
// bevor LoadGroup() läuft (siehe MainWindowViewModel.NavigateToGroupDetail), Group ist dann
// kurzzeitig null — ein verschachtelter Pfad würde dafür jedes Mal einen Binding-Fehler loggen.
public bool IsDifferentiated => Group?.IsDifferentiated ?? false;
partial void OnGroupChanged(LearningGroup? value) => OnPropertyChanged(nameof(IsDifferentiated));
public ObservableCollection<StudentSummary> Students { get; } = []; public ObservableCollection<StudentSummary> Students { get; } = [];
public ObservableCollection<ExamSummary> Exams { get; } = []; public ObservableCollection<ExamSummary> Exams { get; } = [];
LehrerApp.Desktop/Views/Groups/GroupDetailView.axaml
+2 -2
View File
@@ -57,7 +57,7 @@
<DataGridTextColumn Header="Name" Binding="{Binding FullName}" Width="*"/> <DataGridTextColumn Header="Name" Binding="{Binding FullName}" Width="*"/>
<DataGridTextColumn Header="Zeitraum" Binding="{Binding PeriodLabel}" Width="90"/> <DataGridTextColumn Header="Zeitraum" Binding="{Binding PeriodLabel}" Width="90"/>
<DataGridTemplateColumn Header="Niveau" Width="130" <DataGridTemplateColumn Header="Niveau" Width="130"
IsVisible="{Binding Group.IsDifferentiated}"> IsVisible="{Binding IsDifferentiated}">
<DataGridTemplateColumn.CellTemplate> <DataGridTemplateColumn.CellTemplate>
<DataTemplate x:DataType="vm:StudentSummary"> <DataTemplate x:DataType="vm:StudentSummary">
<ComboBox ItemsSource="{x:Static vm:StudentSummary.NiveauOptions}" <ComboBox ItemsSource="{x:Static vm:StudentSummary.NiveauOptions}"
@@ -110,7 +110,7 @@
<DataGridTextColumn Header="Datum" Binding="{Binding Date}" Width="110"/> <DataGridTextColumn Header="Datum" Binding="{Binding Date}" Width="110"/>
<DataGridTextColumn Header="Titel" Binding="{Binding Title}" Width="*"/> <DataGridTextColumn Header="Titel" Binding="{Binding Title}" Width="*"/>
<DataGridTextColumn Header="Niveau" Binding="{Binding NiveauLabel}" Width="80" <DataGridTextColumn Header="Niveau" Binding="{Binding NiveauLabel}" Width="80"
IsVisible="{Binding Group.IsDifferentiated}"/> IsVisible="{Binding IsDifferentiated}"/>
<DataGridTemplateColumn Header="Status" Width="150"> <DataGridTemplateColumn Header="Status" Width="150">
<DataGridTemplateColumn.CellTemplate> <DataGridTemplateColumn.CellTemplate>
<DataTemplate x:DataType="vm:ExamSummary"> <DataTemplate x:DataType="vm:ExamSummary">