MVVM中的ComboBox SelectionChanged

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private void myCombo_selectionChanged(object sender, SelectionChangedEventArgs e)
    ComboBox myCmb = sender as ComboBox;
    List<myType> myList = myCmb.SelectedValue as List<myType>;
    itemsForListView1 = myList.Where((x) => x.myProp > 0); 
    itemsForListView2 = myList.Where((x) => x.myProp < 0);
    // Above 2 collections are of Type List<myType> and their scope will be whole ViewModel, 
    //so i assume i just need to change them and RaisePropChanged but how to change them without breaking mvvm ?
    MyListView1.ItemsSource = itemsForListView1;
    MyListView2.ItemsSource = itemsForListView2;
}

private List<T> selectedItem;
public List<T> SelectedItem
    get { return selectedItem; }
        if (value != selectedItem)
            selectedItem = value;
            ItemsListView1 = new ObservableCollection<T>(selectedItem.Where(x=>x.Prop>0));
            ItemsListView2 = new ObservableCollection<T>(selectedItem.Where(x=>x.Prop<0));
            NotifyOfPropertyChange(() => SelectedItem);         
private ObservableCollection<T> itemsListView1;
public ObservableCollection<T> ItemsListView1
    get { return itemsListView1; }
        if (value != itemsListView1)
            itemsListView1 = value;
            NotifyOfPropertyChange(() => ItemsListView1);
private ObservableCollection<T> itemsListView2;
public ObservableCollection<T> ItemsListView2
    get { return itemsListView2; }
        if (value != itemsListView2)
            itemsListView2 = value;
            NotifyOfPropertyChange(() => ItemsListView2);
}

...
public ViewModelConstructor(...)
    SelectionChangedCommand = new DelegateCommand<List<myType>>(SelectionChangedExecute);
public List<myType> ItemsForListView1 {get; private set} // Implement INotifyPropertyChanged here
public List<myType> ItemsForListView1 {get; private set} // Implement INotifyPropertyChanged here
public ICommand SelectionChangedCommand { get; private set; }
private void SelectionChangedExecute(List<myType> parameter)
    ItemsForListView1 = parameter.Where((x) => x.myProp > 0).ToList(); 
    ItemsForListView2 = parameter.Where((x) => x.myProp < 0).ToList();
...

<ComboBox x:Name="MyComboBox" SelectedIndex="0" ItemsSource="{Binding YourCollectionWithDifferentLists}">
<i:Interaction.Triggers>
    <i:EventTrigger EventName="Loaded">

MVVM中的ComboBox SelectionChanged 内容来源于 Stack Overflow，遵循 CC BY-SA 4.0 许可协议进行翻译与使用。IT领域专用引擎提供翻译支持 腾讯云小微IT领域专用引擎提供翻译支持

2 个回答