使用WPF在XAML中实现CollectionChanged处理程序

Question

我使用了位于stackoverflow:event-fire - when-item-isadd-listview的解决方案来利用CodeBehind中的INotifyCollectionChanged接口。有没有办法在XAML中添加这个eventandler ?

我想用XML定义这一行:

((INotifyCollectionChanged)lbFiles.Items).CollectionChanged += lbFiles_SelectionChanged; 

Answer 1

你应该只是在集合上创建CollectionChanged事件，绑定到你的ListBox/ListView等，直接从后面的代码访问控件不是WPF做事情的方式。

的例子:Xaml:

<Window x:Class="WpfApplication8.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="340" Width="480" Name="UI" >
    <Grid DataContext="{Binding ElementName=UI}">
        <ListBox ItemsSource="{Binding MyProperty}" />
    </Grid>
</Window>

代码:

public partial class MainWindow : Window
{
    private ObservableCollection<string> _myProperty = new ObservableCollection<string>();
    public MainWindow()
    {
        InitializeComponent();
        MyProperty.CollectionChanged += MyProperty_CollectionChanged;
    }
    public ObservableCollection<string> MyProperty
    {
        get { return _myProperty; }
        set { _myProperty = value; }
    }
    void MyProperty_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
    {
        // Collection Changed
    }
}