可重现代码:此异常被抛出,是因为控件“System.Windows.Controls.DataGrid Items.Count:5”的生成器收到了与Items集合的当前状态不符的CollectionChanged事件序列。检测到以下差异:累积计数4与实际计数5不同。[累积计数是(上次重置时的计数+#添加-#删除)。]
XAML:
<Window x:Class="Test1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
<DataGrid ItemsSource="{Binding Items, Mode=OneTime}" PresentationTraceSources.TraceLevel="High"/>
</Grid>
</Window>
代码:
public partial class MainWindow : Window
{
public ExtendedObservableCollection<int> Items { get; private set; }
public MainWindow()
{
InitializeComponent();
Items = new ExtendedObservableCollection<int>();
DataContext = this;
Loaded += MainWindow_Loaded;
}
void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
Task.Factory.StartNew(() =>
{
foreach (var item in Enumerable.Range(1, 500))
{
Items.Add(item);
}
});
}
}