NullReferenceException: 未将对象引用设置到对象的实例。
StackTrace:
   在 System.Windows.Controls.Primitives.Popup.OnWindowResize(Object sender, AutoResizedEventArgs e)
   在 System.Windows.Interop.HwndSource.Resize(Size newSize)
   在 System.Windows.Interop.HwndSource.OnLayoutUpdated(Object obj, EventArgs args)
   在 System.Windows.ContextLayoutManager.fireLayoutUpdateEvent()
   在 System.Windows.ContextLayoutManager.UpdateLayout()
   在 System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg)
   在 System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
   在 System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
   在 System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)
   在 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   在 System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

FileNotFoundException: 无法找到指定文件。
--Message: 无法找到指定文件。
StackTrace:
   在 MS.Internal.TextFormatting.TextMetrics.FullTextLine.FormatLine(FullTextState fullText, Int32 cpFirst, Int32 lineLength, Int32 formatWidth, Int32 finiteFormatWidth, Int32 paragraphWidth, LineFlags lineFlags, FormattedTextSymbols collapsingSymbol)
   在 MS.Internal.TextFormatting.TextMetrics.FullTextLine..ctor(FormatSettings settings, Int32 cpFirst, Int32 lineLength, Int32 paragraphWidth, LineFlags lineFlags)
   在 MS.Internal.TextFormatting.TextFormatterImp.FormatLineInternal(TextSource textSource, Int32 firstCharIndex, Int32 lineLength, Double paragraphWidth, TextParagraphProperties paragraphProperties, TextLineBreak previousLineBreak, TextRunCache textRunCache)
   在 MS.Internal.TextFormatting.TextFormatterImp.FormatLine(TextSource textSource, Int32 firstCharIndex, Double paragraphWidth, TextParagraphProperties paragraphProperties, TextLineBreak previousLineBreak, TextRunCache textRunCache)
   在 System.Windows.Controls.TextBlock.MeasureOverride(Size constraint)
   在 System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   在 System.Windows.UIElement.Measure(Size availableSize)
   在 MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)
   在 System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint)
   在 System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   在 System.Windows.UIElement.Measure(Size availableSize)
   在 System.Windows.Controls.Border.MeasureOverride(Size constraint)
   在 System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   在 System.Windows.UIElement.Measure(Size availableSize)
   在 System.Windows.Controls.Control.MeasureOverride(Size constraint)
   在 System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   在 System.Windows.UIElement.Measure(Size availableSize)
   在 System.Windows.Controls.Decorator.MeasureOverride(Size constraint)
   在 System.Windows.Documents.AdornerDecorator.MeasureOverride(Size constraint)
   在 System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   在 System.Windows.UIElement.Measure(Size availableSize)
   在 System.Windows.Controls.Decorator.MeasureOverride(Size constraint)
   在 System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   在 System.Windows.UIElement.Measure(Size availableSize)
   在 System.Windows.Controls.Primitives.PopupRoot.MeasureOverride(Size constraint)
   在 System.Windows.FrameworkElement.MeasureCore(Size availableSize)
   在 System.Windows.UIElement.Measure(Size availableSize)
   在 System.Windows.Interop.HwndSource.SetLayoutSize()
   在 System.Windows.Interop.HwndSource.set_RootVisualInternal(Visual value)
   在 System.Windows.Controls.Primitives.Popup.SetRootVisualToPopupRoot()
   在 System.Windows.Controls.Primitives.Popup.CreateWindow(Boolean asyncCall)
   在 System.Windows.Controls.Primitives.Popup.OnIsOpenChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
   在 System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   在 System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   在 System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
   在 System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
   在 System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal)
   在 System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
   在 System.Windows.Data.BindingOperations.SetBinding(DependencyObject target, DependencyProperty dp, BindingBase binding)
   在 System.Windows.Controls.Primitives.Popup.CreateRootPopupInternal(Popup popup, UIElement child, Boolean bindTreatMousePlacementAsBottomProperty)
   在 System.Windows.Controls.ToolTip.OnIsOpenChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
   在 System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   在 System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   在 System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
   在 System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
   在 System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal)
   在 System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
   在 System.Windows.Controls.PopupControlService.ShowToolTip(DependencyObject o, Boolean fromKeyboard)
   在 System.Windows.Controls.PopupControlService.PromotePendingToolTipToCurrent(TriggerAction triggerAction)
   在 System.Windows.Threading.DispatcherTimer.FireTick(Object unused)
   在 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   在 System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

FileNotFoundException: 无法找到指定文件。
--Message: 无法找到指定文件。
StackTrace:
   在 MS.Internal.Text.TextInterface.Native.Util.ConvertHresultToException(Int32 hr)
   在 MS.Internal.Text.TextInterface.Font.CreateFontFace()
   在 MS.Internal.Text.TextInterface.Font.AddFontFaceToCache()
   在 MS.Internal.Text.TextInterface.Font.GetFontFace()
   在 MS.Internal.FontCache.FontFaceLayoutInfo.IntMap.TryGetValues(UInt32* pKeys, UInt32 characterCount, UInt16* pIndices)
   在 System.Windows.Media.GlyphTypeface.GetGlyphMetricsAndIndicesOptimized(UInt32* pCodepoints, Int32 characterCount, Double emSize, Single pixelsPerDip, UInt16[] glyphIndices, GlyphMetrics[] glyphMetrics, TextFormattingMode textFormattingMode, Boolean isSideways)
   在 System.Windows.Media.GlyphTypeface.GetGlyphMetricsOptimized(CharacterBufferRange characters, Double emSize, Single pixelsPerDip, UInt16[] glyphIndices, GlyphMetrics[] glyphMetrics, TextFormattingMode textFormattingMode, Boolean isSideways)
   在 System.Windows.Media.TextFormatting.TextShapeableCharacters.GetAdvanceWidthsUnshaped(Char* characterString, Int32 characterLength, Double scalingFactor, Int32* advanceWidthsUnshaped)
   在 MS.Internal.TextFormatting.LineServicesCallbacks.GetRunCharWidths(IntPtr pols, Plsrun plsrun, LsDevice device, Char* charString, Int32 stringLength, Int32 maxWidth, LsTFlow textFlow, Int32* charWidths, Int32& totalWidth, Int32& stringLengthFitted)