在 System.Windows.Freezable.Freeze()
   在 Quicker.Utilities.IconHelper.UrlToBitmapSource(String url)
   在 Quicker.View.Controls.IconControl.UpdateIcon()
   在 Quicker.View.Controls.IconControl.OnValueChanged(DependencyObject dpobj, 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 Quicker.View.PopupWindow.<>c__DisplayClass10_0.<CreateMenuForEmptyButton>g__CreateNewActionMenuItem|0(String header, ActionType newActionType, String icon)
   在 Quicker.View.PopupWindow.CreateMenuForEmptyButton(Int32 btnIndex, ContextMenu menu)
   在 Quicker.View.PopupWindow.ShowBtnContextMenu(ActionButton btn)
   在 Quicker.View.PopupWindow.<BtnOnPreviewMouseUp>d__3.MoveNext()
--- 引发异常的上一位置中堆栈跟踪的末尾 ---
   在 System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   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)