WPF - Refresh ListView terikat ke ViewModel

Question

Saya sedang menulis aplikasi saat ini dan telah menemukan masalah dengan ListView yang menampilkan item dari Model Tampilan; ada properti dalam model tampilan tersebut "Selected" yang hanya berupa bool dan, saya mengikatnya ke properti "IsSelected" ListView.

Saya memiliki tombol untuk "Hapus Seleksi" yang mengulangi setiap item yang dipilih dan menyetelnya ke false; ini berfungsi dan perintah diperbarui dan tombol tidak lagi diaktifkan karena tidak ada tempat Selected == true.

Dalam Gambar

Item dipilih; tombol tersedia.

Tombol "Hapus Pilihan" ditekan

Pada titik ini, saya tidak bisa lagi mengklik kontrol untuk memilih elemen; Saya harus mengontrol klik untuk membatalkan pilihan yang membuat semuanya kembali sebagai dinonaktifkan dan tidak ada yang dipilih.

Inilah XAML untuk kontrol - tidak yakin apa yang bisa saya lakukan salah tetapi sejauh ini saya tidak dapat menemukan jawaban.

<ListView ItemsSource="{Binding AssignableItems, UpdateSourceTrigger=PropertyChanged}" Grid.Row="2" SelectionMode="Extended">
    <ListView.ItemContainerStyle>
        <Style TargetType="ListViewItem" BasedOn="{StaticResource lviStyleBase}">
            <Setter Property="IsSelected" Value="{Binding Selected, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
        </Style>
    </ListView.ItemContainerStyle>
    <ListView.View>
        <GridView>
            <GridViewColumn Header="Created" DisplayMemberBinding="{Binding ContactCreated}" Width="Auto" />
            <GridViewColumn Header="Contact Name" DisplayMemberBinding="{Binding ContactName}" Width="Auto" />
            <GridViewColumn Header="Company" DisplayMemberBinding="{Binding Company}" Width="Auto" />
        </GridView>
    </ListView.View>
</ListView>

Inilah ViewModel:

namespace CSI.ViewModels
{
    public class AssignViewModel
        : ModelBase
    {
        #region Properties
        private bool viewingFilters;

        public bool Filtering
        {
            get { return viewingFilters; }
            set { if ( SetValue(ref viewingFilters, value) ) Notify(); }
        }

        private bool assigning;

        public bool Assigning
        {
            get { return assigning; }
            set { if ( SetValue(ref assigning, value) ) Notify(); }
        }

        private string viewTitle = "Assign";
        public string ViewTitle
        {
            get => $"{viewTitle}{(Filtered ? " (filtered)" : "")}";
        }

        private AssignFilterValuesModel filters;

        public AssignFilterValuesModel Filters
        {
            get { return filters; }
            set { SetValue(ref filters, value); }
        }

        public bool Filtered
        {
            get
            {
                if ( filters == null ) return false;

                return assignables.Count() != AssignableItems.Count();
            }
        }

        private bool loading;

        public bool Loading
        {
            get { return loading; }
            set { SetValue(ref loading, value); }
        }

        private ObservableCollection<AssignableWorkItemModel> assignables;
        public ObservableCollection<AssignableWorkItemModel> AssignableItems
        {
            get
            {
                if ( assignables == null ) return null;
                if ( Filters == null ) return assignables;

                var retval = assignables.Where(x => 1 == 1);

                if ( Filters.Dealers.Any(x => x.Selected) )
                    retval = retval.Where(x => filters.Dealers.Where(o => o.Selected).Select(o => o.Key).ToList().Contains(x.Dealer));

                if ( Filters.VehicleModels.Any(x => x.Selected) )
                    retval = retval.Where(x => filters.VehicleModels.Where(o => o.Selected).Select(o => o.Key).ToList().Contains(x.VehicleModel));

                return new ObservableCollection<AssignableWorkItemModel>(retval);
            }
            set => SetValue(ref assignables, value);
        }
        private ObservableCollection<AssignableWorkItemModel> selected;
        public ObservableCollection<AssignableWorkItemModel> SelectedItems
        {
            get => selected;
            set => SetValue(ref selected, value);
        }
        #endregion
        #region Commands
        private RelayCommand displayFilterScreen;
        public void Execute_DisplayFilters(object _)
        {
            Filtering = true;
        }
        public bool CanExecute_DisplayFilters(object _) => !Filtering;
        public RelayCommand DisplayFilters
        {
            get => displayFilterScreen ?? (displayFilterScreen = new RelayCommand(Execute_DisplayFilters, CanExecute_DisplayFilters));
        }

        private RelayCommand applyFilters;
        public void Execute_ApplyFilters(object _)
        {
            Filtering = !Filtering;
            Notify(nameof(AssignableItems));
            Notify(nameof(Filtered));
            Notify(nameof(ViewTitle));
        }
        public bool CanExecute_ApplyFilters(object _) => Filtering;
        public RelayCommand ApplyFilters
        {
            get => applyFilters ?? (applyFilters = new RelayCommand(Execute_ApplyFilters, CanExecute_ApplyFilters));
        }

        private RelayCommand doAssign;
        public void Execute_Assign(object _)
        {
            UserSelectWindow us = new UserSelectWindow();
            us.Owner = Application.Current.MainWindow;

            ViewModelServer.UserSelectVM.Prompt = "Select the user you wish to assign these items to";
        }
        public bool CanExecute_Assign(object _) => !Filtering && (bool)AssignableItems?.Any(x => x.Selected);
        public RelayCommand Assign
        {
            get => doAssign ?? (doAssign = new RelayCommand(Execute_Assign, CanExecute_Assign));
        }

        private RelayCommand clrSelection;
        public void Execute_ClearSelection(object _)
        {
            AssignableItems?.Where(x => x.Selected).ToList().ForEach(x => x.Selected = false);
        }
        public bool CanExecute_ClearSelection(object _) => (bool)AssignableItems?.Any(x => x.Selected);
        public RelayCommand ClearSelection
        {
            get => clrSelection ?? (clrSelection = new RelayCommand(Execute_ClearSelection, CanExecute_ClearSelection));
        }
        #endregion
        #region Constructors
        
        #endregion
    }
}

Answer 1

Solusinya adalah menambahkan pengikatan untuk SelectedIndex dan menyetel nilainya ke -1 saat memanggil ClearSelection; tip dari sini