[WPF] ICollectionView, List Group view

 

ex) AI Sample

 

.cs

// In your ViewModel
public class MyViewModel : INotifyPropertyChanged
{
    private ObservableCollection<MyItem> _allItems;
    public ICollectionView FilteredItems { get; private set; }
    private string _filterText;

    public string FilterText
    {
        get { return _filterText; }
        set
        {
            if (_filterText != value)
            {
                _filterText = value;
                OnPropertyChanged(nameof(FilterText));
                FilteredItems.Refresh(); // Re-apply the filter
            }
        }
    }

    public MyViewModel()
    {
        _allItems = new ObservableCollection<MyItem>
        {
            new MyItem { Name = "Apple" },
            new MyItem { Name = "Banana" },
            new MyItem { Name = "Orange" },
            new MyItem { Name = "Grape" }
        };

        FilteredItems = CollectionViewSource.GetDefaultView(_allItems);
        FilteredItems.Filter = FilterMethod;
    }

    private bool FilterMethod(object item)
    {
        if (string.IsNullOrWhiteSpace(FilterText))
        {
            return true; // Show all items if no filter text
        }
        var myItem = item as MyItem;
        return myItem != null && myItem.Name.Contains(FilterText, StringComparison.OrdinalIgnoreCase);
    }

    // INotifyPropertyChanged implementation
    public event PropertyChangedEventHandler PropertyChanged;
    protected void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

 

 

xaml

<!-- In your XAML -->
<StackPanel>
    <TextBox Text="{Binding FilterText, UpdateSourceTrigger=PropertyChanged}"/>
    <ListBox ItemsSource="{Binding FilteredItems}"/>
</StackPanel>

 

 

 

 

# Practice

ListBox ItemsSource 를  ICollectionView 프로퍼티로 바인딩

ListBox.GroupStyle 추가

 

아래 Name 바인딩은 ICollectionView 의 Group에서의 프로퍼티 Name

 

ICollectionView 프로퍼티 추가

INotifypropertyChanged (=setvalue) 해줘야 dataChanged 반영 됨.

 

 

ICollectionView  InnerList에 기존 바인딩하던 소스 프로퍼티 넣고

 

어떤거 그룹으로 나눌지 GroupDescriptions.Add(string name); 

=> xaml 에서  {Binding Name} 으로 바인딩한 Name 에 출력되는 이름.

 

 

 

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https://afsdzvcx123.tistory.com/entry/WPF-WPF-Listbox-%EC%BB%A8%ED%8A%B8%EB%A1%A4-Group-%EB%B3%84%EB%A1%9C-%ED%95%84%ED%84%B0%ED%95%98%EA%B8%B0

[WPF] WPF Listbox 컨트롤 Group 별로 필터하기