回答編集履歴
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add code
test
CHANGED
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@@ -3,3 +3,101 @@
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単一選択モードであれば、ListBox.SelectedItemにViewModelのプロパティをバインドさせて、ViewModel側へ選択インスタンスを通知する方法もあります。
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```XML
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<ListBox Name="listbox" Grid.Column="0"
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ItemsSource="{Binding People}"
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SelectedItem="{Binding SelectedPerson}">
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<ListBox.ItemTemplate>
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<HierarchicalDataTemplate>
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<TextBlock Text="{Binding Name}" />
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</HierarchicalDataTemplate>
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</ListBox.ItemTemplate>
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</ListBox>
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```
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```C#
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public class MainWindowViewModel : INotifyPropertyChanged
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{
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public ObservableCollection<Person> People { get; set; }
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= new ObservableCollection<Person>();
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private Person _SelectedPerson = null;
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public Person SelectedPerson
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{
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get { return _SelectedPerson; }
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set
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{
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_SelectedPerson = value;
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OnPropertyChanged();
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}
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}
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public MainWindowViewModel()
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{
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People.Add(new Person { Name = "Human01" });
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People.Add(new Person { Name = "Human02" });
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People.Add(new Person { Name = "Human03" });
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People.Add(new Person { Name = "Human04" });
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People.Add(new Person { Name = "Human05" });
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}
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public event PropertyChangedEventHandler PropertyChanged;
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protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
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{
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PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
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}
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}
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```
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※DelegateCommandは今回の問題には不要なので割愛しました。
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