我已经构建了自定义规则引擎，其中该引擎的每个元素都是DependencyObject类的后代，因此可以在 XAML 中对其进行描述，包括对依赖属性、标记扩展、绑定等的支持。此规则引擎的目的是处理作为输入的某些信息并将输出信息返回到队列。整个对象树在单个线程中被实例化一次（来自 XAML），并且正在从输入队列处理一系列输入对象。在我增加线程数之前一切正常 - 有时（并非总是如此！）它会引发以下异常：
System.InvalidOperationException: Hashtable insert failed. Load factor too high. The most common cause is multiple threads writing to the Hashtable simultaneously.
at System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add)
at MS.Internal.Data.ValueChangedEventManager.PrivateAddListener(Object source, IWeakEventListener listener, PropertyDescriptor pd)
at MS.Internal.Data.PropertyPathWorker.ReplaceItem(Int32 k, Object newO, Object parent)
at MS.Internal.Data.PropertyPathWorker.UpdateSourceValueState(Int32 k, ICollectionView collectionView, Object newValue, Boolean isASubPropertyChange)
at MS.Internal.Data.PropertyPathWorker.OnDependencyPropertyChanged(DependencyObject d, DependencyProperty dp, Boolean isASubPropertyChange)
at System.Windows.Data.BindingExpression.HandlePropertyInvalidation(DependencyObject d, DependencyPropertyChangedEventArgs args)
at System.Windows.Data.BindingExpressionBase.OnPropertyInvalidation(DependencyObject d, DependencyPropertyChangedEventArgs args)
at System.Windows.Data.BindingExpression.OnPropertyInvalidation(DependencyObject d, DependencyPropertyChangedEventArgs args)
at System.Windows.DependentList.InvalidateDependents(DependencyObject source, DependencyPropertyChangedEventArgs sourceArgs)
at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
at System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal)
at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
...
所以我想知道，这是 WPF 内部的一个错误，还是我必须仔细查看我的代码？有没有人遇到过这样的问题？由于我不使用任何可能相互干扰的全局线程不安全对象，我希望 DependencyObject 在多线程环境中正常工作，对吗？