我收到来自远程登录应用程序的用户的错误报告。该应用程序运行良好，直到他们回到办公室并直接登录到他们的桌面 - 应用程序崩溃并且错误报告是标准的“可冻结不能被冻结”，但没有一个已知的解决方法可以解决这个问题。
应用程序中的每个 Brush 资源都用 ice:Freeze 装饰：
<SolidColorBrush ice:Freeze="true"
此外，异常作为域未处理的异常被抛出，因此现在有办法吞下它。
在过去的几个月里，我花了几个小时分析 Freezables 机器人报告的问题，但找不到任何解决方案。
发生问题的 .NET 代码：
/// <summary>
/// Unbinds a Freezable from its Context.
/// </summary>
/// <param name="resource">The resource to freeze.</param>
private static void Freeze(object resource)
{
Freezable freezable = resource as Freezable;
if (freezable != null && !freezable.IsFrozen)
{
freezable.Freeze();
}
}
/// <summary>
/// Searches for a resource inside a ResourceDictionary.
/// </summary>
/// <param name="key">The original key.</param>
/// <param name="typeKey">The key cast to Type.</param>
/// <param name="resourceKey">The key cast to ResourceKey.</param>
/// <param name="isTraceEnabled">Tracing on/off.</param>
/// <param name="allowDeferredResourceReference">
/// If this flag is true the resource will not actually be inflated from Baml.
/// Instead we will return an instance of DeferredDictionaryReference which
/// can later be used to query the resource
/// </param>
/// <param name="mustReturnDeferredResourceReference">
/// If this method is true this method will always return a
/// DeferredThemeResourceReference instance which envelopes the underlying resource.
/// </param>
/// <param name="canCache">Whether callers can cache the value.</param>
/// <returns></returns>
private static object FindDictionaryResource(
object key,
Type typeKey,
ResourceKey resourceKey,
bool isTraceEnabled,
bool allowDeferredResourceReference,
bool mustReturnDeferredResourceReference,
out bool canCache)
{
// Thread safety handled by FindResourceInternal. Be sure to have locked _resourceCache.SyncRoot.
Debug.Assert(typeKey != null || resourceKey != null, "typeKey or resourceKey should be non-null");
canCache = true;
object resource = null;
Assembly assembly = (typeKey != null) ? typeKey.Assembly : resourceKey.Assembly;
if ((assembly == null) || IgnoreAssembly(assembly))
{
// Without an assembly, we can't figure out which dictionary to look at.
// Also, ignore some common assemblies we know to not contain resources.
return null;
}
ResourceDictionaries dictionaries = EnsureDictionarySlot(assembly);
ResourceDictionary dictionary = dictionaries.LoadThemedDictionary(isTraceEnabled);
if (dictionary != null)
{
resource = LookupResourceInDictionary(dictionary, key, allowDeferredResourceReference, mustReturnDeferredResourceReference, out canCache);
}
if (resource == null)
{
dictionary = dictionaries.LoadGenericDictionary(isTraceEnabled);
if (dictionary != null)
{
resource = LookupResourceInDictionary(dictionary, key, allowDeferredResourceReference, mustReturnDeferredResourceReference, out canCache);
}
}
if (resource != null)
{
// Resources coming out of the dictionary may need to be frozen
Freeze(resource);
}
return resource;
}
System.InvalidOperationException：无法冻结此 Freezable。在 System.Windows.Freezable.Freeze() 在 System.Windows.SystemResources.Freeze（对象资源） 在 System.Windows.SystemResources.FindDictionaryResource（对象键，类型 typeKey，ResourceKey resourceKey，布尔 isTraceEnabled，布尔 allowDeferredResourceReference，布尔 mustReturnDeferredResourceReference，布尔& canCache) 在 System.Windows.SystemResources.FindResourceInternal(Object key, Boolean allowDeferredResourceReference, Boolean mustReturnDeferredResourceReference) 在 System.Windows.FrameworkElement.FindResourceInternal(FrameworkElement fe, FrameworkContentElement fce, DependencyProperty dp, Object resourceKey, Object unlinkedParent, Boolean allowDeferredResourceReference, Boolean mustReturnDeferredResourceReference, DependencyObject 边界元素，
1 dataField, ItemStructList1 dataField, DependencyObject container, Int32 childIndex, FrameworkObject child, DependencyProperty dp, FrugalStructListSystem.Windows.StyleHelper.GetChildValue（UncommonField 1& childRecordFromChildIndex、EffectiveValueEntry& 条目、ValueLookupType& sourceType、FrameworkElementFactory templateRoot）处的1& valueLookupList、DependencyProperty dp、DependencyObject 容器、FrameworkObject 子项、Int32 childIndex、Boolean styleLookup、EffectiveValueEntry& 条目、ValueLookupType & sourceType、FrameworkElementFactory templateRoot） System.Windows.StyleHelper.GetValueFromTemplatedParent（DependencyObject 容器，Int32 childIndex，FrameworkObject 子项，DependencyProperty dp，FrugalStructList1& childRecordFromChildIndex, FrameworkElementFactory templateRoot, EffectiveValueEntry& entry) at System.Windows.FrameworkElement.GetValueFromTemplatedParent(DependencyProperty dp, EffectiveValueEntry& entry) at System.Windows.FrameworkElement.GetRawValue(DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry& entry) at System.Windows.FrameworkElement.EvaluateBaseValueCore(DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry& newEntry) at System.Windows.DependencyObject.EvaluateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry newEntry, OperationType operationType) 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.InvalidateProperty(DependencyProperty dp) at System.Windows.StyleHelper.InvalidateResourceDependentsForChild(DependencyObject container, DependencyObject child, Int32 childIndex, ResourcesChangeInfo info, FrameworkTemplate parentTemplate) at System.Windows.TreeWalkHelper.InvalidateStyleAndReferences(DependencyObject d, ResourcesChangeInfo info, Boolean containsTypeOfKey) at System.Windows.TreeWalkHelper.OnResourcesChanged(DependencyObject d, ResourcesChangeInfo info, Boolean raiseResourceChangedEvent) at System.Windows.TreeWalkHelper.OnResourcesChangedCallback(DependencyObject d, ResourcesChangeInfo info) at System.Windows.DescendentsWalker1._VisitNode（DependencyObject d）在 System.Windows.DescendentsWalker1.VisitNode(FrameworkElement fe) at System.Windows.DescendentsWalker1.VisitNode（DependencyObject d）在 System.Windows.DescendentsWalker1.WalkLogicalChildren(FrameworkElement feParent, FrameworkContentElement fceParent, IEnumerator logicalChildren) at System.Windows.DescendentsWalker1.WalkFrameworkElementLogicalThenVisualChildren(FrameworkElement feParent, Boolean hasLogicalChildren) 在 System.Windows.DescendentsWalker1.IterateChildren(DependencyObject d) at System.Windows.DescendentsWalker1._VisitNode(DependencyObject d) 在 System.Windows.DescendentsWalker1.VisitNode(FrameworkElement fe) at System.Windows.DescendentsWalker1.VisitNode(DependencyObject d) 在 System.Windows.DescendentsWalker1.WalkFrameworkElementLogicalThenVisualChildren(FrameworkElement feParent, Boolean hasLogicalChildren) at System.Windows.DescendentsWalker1.IterateChildren(DependencyObject d) 在System.Windows.DescendentsWalker1._VisitNode(DependencyObject d) at System.Windows.DescendentsWalker1.VisitNode(FrameworkElement fe) 在 System.Windows.DescendentsWalker1.VisitNode(DependencyObject d) at System.Windows.DescendentsWalker1.WalkLogicalChildren(FrameworkElement feParent, FrameworkContentElement fceParent, IEnumerator logicalChildren) 在 System.Windows.DescendentsWalker1.WalkFrameworkElementLogicalThenVisualChildren(FrameworkElement feParent, Boolean hasLogicalChildren) at System.Windows.DescendentsWalker1.IterateChildren(DependencyObject d) 在 System.Windows.DescendentsWalker1._VisitNode(DependencyObject d) at System.Windows.DescendentsWalker1.VisitNode(FrameworkElement fe) 在 System.Windows.DescendentsWalker1.VisitNode(DependencyObject d) at System.Windows.DescendentsWalker1.WalkLogicalChildren(FrameworkElement feParent, FrameworkContentElement fceParent, IEnumerator logicalChildren) 在 System.Windows.DescendentsWalker1.WalkFrameworkElementLogicalThenVisualChildren(FrameworkElement feParent, Boolean hasLogicalChildren) at System.Windows.DescendentsWalker1.IterateChildren(DependencyObject d) 在 System.Windows.DescendentsWalker1._VisitNode(DependencyObject d) at System.Windows.DescendentsWalker1.VisitNode(FrameworkElement fe) 在 System.Windows.DescendentsWalker1.VisitNode(DependencyObject d) at System.Windows.DescendentsWalker1.WalkLogicalChildren(FrameworkElement feParent, FrameworkContentElement fceParent, IEnumeratorlogicalChildren) 在 System.Windows.DescendentsWalker1.WalkFrameworkElementLogicalThenVisualChildren(FrameworkElement feParent, Boolean hasLogicalChildren) at System.Windows.DescendentsWalker1.IterateChildren(DependencyObject d) 在 System.Windows.DescendentsWalker1._VisitNode(DependencyObject d) at System.Windows.DescendentsWalker1.VisitNode(FrameworkElement fe) 在 System.Windows.DescendentsWalker1.VisitNode(DependencyObject d) at System.Windows.DescendentsWalker1.WalkLogicalChildren(FrameworkElement feParent, FrameworkContentElement fceParent, IEnumerator logicalChildren) 在 System.Windows.DescendentsWalker1.WalkFrameworkElementLogicalThenVisualChildren(FrameworkElement feParent, Boolean hasLogicalChildren) at System.Windows.DescendentsWalker1.IterateChildren(DependencyObject d) 在 System.Windows.DescendentsWalker1._VisitNode(DependencyObject d) at System.Windows.DescendentsWalker1.VisitNode(FrameworkElement fe) 在 System.Windows.DescendentsWalker1.VisitNode(DependencyObject d) at System.Windows.DescendentsWalker1.WalkLogicalChildren(FrameworkElement feParent, FrameworkContentElement fceParent, IEnumerator logicalChildren) 在 System.Windows.DescendentsWalker1.WalkFrameworkElementLogicalThenVisualChildren(FrameworkElement feParent, Boolean hasLogicalChildren) at System.Windows.DescendentsWalker1.IterateChildren(DependencyObject d) at System.Windows.DescendentsWalker`1.StartWalk(DependencyObject startNode, Boolean skipStartNode) at System.Windows.TreeWalkHelper.InvalidateOnResourcesChange(FrameworkElement fe, FrameworkContentElement fce, ResourcesChangeInfo info) 在 System.Windows.SystemResources.InvalidateTreeResources (Object args) 在 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) 在 MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)