WPF窗体中有一个DateGrid和两个Button控件，一个Button不停地往DateGrid添加数据，另一个Button不停的删除数据,操作过程中不停的拉动DateGrid滚动条，此时报“System.ArgumentException:“高度必须为非负值。”异常”
代码：
public partial class MainWindow : Window
{
public ObservableCollection<Student> StudentList = new ObservableCollection<Student>();
private static object lockObject = new object();
private static Mutex mut = new Mutex();
private int id = 1;
public MainWindow()
{
InitializeComponent();
this.studentList.ItemsSource = StudentList;
}
private void Button_Click(object sender, RoutedEventArgs e)
{
try
{
Task.Run(() =>
{
while (true)
{
//mut.WaitOne();
lock (lockObject)
{
Dispatcher.Invoke(() =>
{
////for (int i = 0; i < 100; i++)
StudentList.Add(new Student() { ID = id++, Name = "Test" + id++, Age = id++ });
});
Task.Delay(500);
}
//mut.ReleaseMutex();
}
});
}
catch (Exception ex)
{
Console.WriteLine(ex.Message + "\r" + ex.StackTrace);
return;
}
}
private void Button_Click_1(object sender, RoutedEventArgs e)
{
Task.Run(() =>
{
while (StudentList.Count > 0)
{
//mut.WaitOne();
lock (lockObject)
{
Dispatcher.Invoke(() =>
{
//if (StudentList.Count > 0)
StudentList.RemoveAt(0);
});
Task.Delay(500);
}
//mut.ReleaseMutex();
}
});
}
}
异常信息：
System.ArgumentException
HResult=0x80070057
Message=高度必须为非负值。
Source=WindowsBase
StackTrace:
在 System.Windows.Rect.set_Height(Double value)
在 System.Windows.Controls.VirtualizingStackPanel.ExtendViewport(IHierarchicalVirtualizationAndScrollInfo virtualizationInfoProvider, Boolean isHorizontal, Rect viewport, VirtualizationCacheLength cacheLength, VirtualizationCacheLengthUnit cacheUnit, Size stackPixelSizeInCacheBeforeViewport, Size stackLogicalSizeInCacheBeforeViewport, Size stackPixelSizeInCacheAfterViewport, Size stackLogicalSizeInCacheAfterViewport, Size stackPixelSize, Size stackLogicalSize, Int32& itemsInExtendedViewportCount)
在 System.Windows.Controls.VirtualizingStackPanel.IsExtendedViewportFull()
在 System.Windows.Controls.VirtualizingStackPanel.ShouldItemsChangeAffectLayoutCore(Boolean areItemChangesLocal, ItemsChangedEventArgs args)
在 System.Windows.Controls.VirtualizingPanel.OnItemsChangedInternal(Object sender, ItemsChangedEventArgs args)
在 System.Windows.Controls.Panel.OnItemsChanged(Object sender, ItemsChangedEventArgs args)
在 System.Windows.Controls.ItemContainerGenerator.OnItemAdded(Object item, Int32 index)
在 System.Windows.Controls.ItemContainerGenerator.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
在 System.Windows.WeakEventManager.ListenerList`1.DeliverEvent(Object sender, EventArgs e, Type managerType)
在 System.Windows.WeakEventManager.DeliverEvent(Object sender, EventArgs args)
在 System.Collections.Specialized.CollectionChangedEventManager.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
在 System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
在 System.Windows.Data.CollectionView.OnCollectionChanged(NotifyCollectionChangedEventArgs args)
在 System.Windows.Controls.ItemCollection.OnViewCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
在 System.Windows.WeakEventManager.ListenerList`1.DeliverEvent(Object sender, EventArgs e, Type managerType)
在 System.Windows.WeakEventManager.DeliverEvent(Object sender, EventArgs args)
在 System.Collections.Specialized.CollectionChangedEventManager.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
在 System.Windows.Data.CollectionView.OnCollectionChanged(NotifyCollectionChangedEventArgs args)
在 System.Windows.Data.ListCollectionView.ProcessCollectionChangedWithAdjustedIndex(NotifyCollectionChangedEventArgs args, Int32 adjustedOldIndex, Int32 adjustedNewIndex)
在 System.Windows.Data.ListCollectionView.ProcessCollectionChanged(NotifyCollectionChangedEventArgs args)
在 System.Windows.Data.CollectionView.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
在 System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
在 System.Collections.ObjectModel.ObservableCollection`1.InsertItem(Int32 index, T item)
在 System.Collections.ObjectModel.Collection`1.Add(T item)
在 DataGridDemo.MainWindow.<Button_Click>b__5_1() 在 F:\1.Study\WPF\WpfStyles\src\DataGridDemo\MainWindow.xaml.cs 中: 第 49 行
在 System.Windows.Threading.DispatcherOperation.InvokeDelegateCore()
在 System.Windows.Threading.DispatcherOperation.InvokeImpl()
此异常最初是在此调用堆栈中引发的:
[外部代码]
DataGridDemo.MainWindow.Button_Click.AnonymousMethod__5_1() (位于 MainWindow.xaml.cs 中)
[外部代码]
之前是没有加锁，复现概率很高，加了锁之后会好点，不过还是会有问题。错误如下图：
