Question

我有一个ListBox，其SelectionMode属性设置为Extended，以允许在ListBox内进行多次选择。 ListBox绑定到ObservableCollection。我想要做的是，当我按下删除键时，列表框中的所选项目将从ObservableCollection中删除。我知道如何设置键绑定并使用删除键的命令，但我不确定如何从ListBox中获取多个选项。

这是列表框：

<ListBox ItemsSource="{Binding XtfPaths}"
         SelectionMode="Extended"/>

这里是viewmodel：

private ObservableCollection<String> _xtfPaths = new ObservableCollection<String>();
public ObservableCollection<String> XtfPaths
{
    get { return _xtfPaths; }
    set
    {
        if (null != value)
        {
            _xtfPaths = value;
            OnPropertyChanged("XtfPaths");
        }
    }
}

Answer 1

试试这个

<Grid>
    <StackPanel>
        <ListBox x:Name="list" Height="200"
        SelectionMode="Extended"
        ItemsSource="{Binding SampleItems}" >
        </ListBox>
        <Button  Content="Remove" Command="{Binding DeleteCommand}"
        CommandParameter="{Binding ElementName=list, Path=SelectedItems}">
        </Button>
    </StackPanel>
</Grid>

 public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        DataContext = new MainViewModel1();
    }
}

public class MainViewModel1
{
    private ObservableCollection<string> m_items;
    public ObservableCollection<string> SampleItems
    {
        get { return m_items; }
        set { m_items = value; }
    }

    public ICommand DeleteCommand { get; private set; }

    public MainViewModel1()
    {
        DeleteCommand = new RelayCommand<object>(Delete, CanDelete);

        var items = new ObservableCollection<string>();
        var today = DateTime.Now;
        for (int i = 1; i <= 10; i++)
        {
            items.Add("Test"+i);
        }
        SampleItems = items;
    }

    private void Delete(object obj)
    {
        var items = new ObservableCollection<string>();
        foreach (var item in (IList)obj)
        {
            items.Add((string)item);
        }
        foreach (var item in items)
        {
            m_items.Remove(item);
        }
    }

    private bool CanDelete(object obj)
    {
        return true;
    }

}

删除ListBox中的多个选择

1 个答案: