c# – 添加/删除行时,WPF DataGrid是否会触发事件？

您可以尝试获取DataGrid.ItemsSource集合,并订阅其CollectionChanged事件.这只有在你知道它首先是什么类型的集合时才有效.

// Be warned that the `Loaded` event runs anytime the window loads into view,// so you will probably want to include an Unloaded event that detaches the
// collection
private void DataGrid_Loaded(object sender,RoutedEventArgs e)
{
    var dg = (DataGrid)sender;
    if (dg == null || dg.ItemsSource == null) return;

    var sourceCollection = dg.ItemsSource as ObservableCollection<ViewModelBase>;
    if (sourceCollection == null) return;

    sourceCollection .CollectionChanged += 
        new NotifyCollectionChangedEventHandler(DataGrid_CollectionChanged);
}

void DataGrid_CollectionChanged(object sender,NotifyCollectionChangedEventArgs e)
{
    // Execute your logic here
}

另一种解决方案是使用事件系统,如Microsoft Prism的EventAggregator或MVVM Light的Messenger.这意味着只要绑定集合发生更改,ViewModel就会广播DataCollectionChanged事件消息,并且View会订阅接收这些消息并在任何时候执行代码.

使用EventAggregator

// Subscribe
eventAggregator.GetEvent<CollectionChangedMessage>().Subscribe(DoWork);

// Broadcast
eventAggregator.GetEvent<CollectionChangedMessage>().Publish();

使用Messenger

//Subscribe
Messenger.Default.Register<CollectionChangedMessage>(DoWork);

// Broadcast
Messenger.Default.Send<CollectionChangedMessage>()