使用WPF在XAML中实现CollectionChanged处理程序 [英] Implementing CollectionChanged Handler in XAML with WPF

问题描述

我使用的解决方案位于 stackoverflow:event-fired-when -item-is-add-to-listview 以使用CodeBehind中的INotifyCollectionChanged接口.有没有办法在XAML中添加此EventHandler?

I used the solution located at stackoverflow:event-fired-when-item-is-added-to-listview to utilize interface INotifyCollectionChanged in CodeBehind. Is there a way to add this EventHandler within the XAML?

本质上，我希望此行以XML定义:

Essentially, I want this line defined in XML:

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

推荐答案

您应该只在绑定到ListBox/ListView等的集合上创建CollectionChanged事件，从后面的代码严格访问控件不是WPF做事的方式.

You should just be creating the CollectionChanged event on the collection that is bound to your ListBox/ListView etc, accessing controls derictly from code behind is not the WPF way to do things.

示例:

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
    }
}

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