c# - 不调用ConvertBack

我正在尝试编写一个通用控件，在其中可以通过INotifyPropertyChanged转换器传递不同的数据模型（所有实现）。数据可以毫无问题地传递到控件中，并可以正确显示（其中一些还使用IMultivalueConverts，可以正常工作）。尽管修改了数据，但IMultiValueConverter不调用MainControl的。

通用控件应仅显示根据ObservableCollection中的坐标计算出的矩形。

我将DebugConverters放在所有绑定上，除了ConvertBack之外，所有内容似乎都已更新。ListBox中的SourceUpdate也被调用。

我用不同的NotifyOn ... Updated，Mode和UpdateSourceTrigger尝试了此转换器，我总是看到控件中的值发生了变化，但从未看到主控件的ConvertBack。

使用了部分数据模板（更新正确完成），所有的DegreeTo ...转换器都被双向调用

        <DataTemplate x:Key="RectangleWithLabel">
            <Canvas IsHitTestVisible="True">
                <Rectangle x:Name="RectangleROI" MouseLeftButtonDown="myCanvas_PreviewMouseLeftButtonDown" >
                    <!--
                    <Rectangle.Visibility>
                        <Binding Path="ROI" Converter="{StaticResource NullToVisibilityConverter}"/>
                    </Rectangle.Visibility>
                    -->
                    <Canvas.Left>
                        <MultiBinding Converter="{StaticResource DegreeToScreenPixelConverterH}" Mode="TwoWay" NotifyOnSourceUpdated="True" NotifyOnTargetUpdated="True" UpdateSourceTrigger="PropertyChanged" >
                            <Binding Path="ROI.Begin.PosH" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged" NotifyOnSourceUpdated="True" NotifyOnTargetUpdated="True" />
                            <Binding Path="DataContext.UsedCoordinateSystem" RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type UserControl}}" NotifyOnSourceUpdated="True" Mode="TwoWay" NotifyOnTargetUpdated="True" UpdateSourceTrigger="PropertyChanged" />
                        </MultiBinding>
                    </Canvas.Left>
                    <Canvas.Top>
                        <MultiBinding Converter="{StaticResource DegreeToScreenPixelConverterV}"  Mode="TwoWay" NotifyOnSourceUpdated="True" NotifyOnTargetUpdated="True" UpdateSourceTrigger="PropertyChanged">
                            <Binding Path="ROI.Begin.PosV" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged"   NotifyOnSourceUpdated="True" NotifyOnTargetUpdated="True" />
                            <Binding Path="DataContext.UsedCoordinateSystem" RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type UserControl}}" NotifyOnSourceUpdated="True" Mode="TwoWay" NotifyOnTargetUpdated="True" UpdateSourceTrigger="PropertyChanged"/>
                        </MultiBinding>
                    </Canvas.Top>
                    <Rectangle.Width>
                        <MultiBinding Converter="{StaticResource DegreeToScreenPixelWidthConverter}"  Mode="TwoWay" NotifyOnSourceUpdated="True" NotifyOnTargetUpdated="True" UpdateSourceTrigger="PropertyChanged">
                            <Binding Path="ROI.Begin.PosH" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged" NotifyOnSourceUpdated="True" NotifyOnTargetUpdated="True" />
                            <Binding Path="ROI.End.PosH" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged"   NotifyOnSourceUpdated="True" NotifyOnTargetUpdated="True" />
                            <Binding Path="DataContext.UsedCoordinateSystem" RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type UserControl}}" NotifyOnSourceUpdated="True" Mode="TwoWay" NotifyOnTargetUpdated="True"/>
                        </MultiBinding>
                    </Rectangle.Width>
                    <Rectangle.Height>
                        <MultiBinding Converter="{StaticResource DegreeToScreenPixelHeightConverter}"  Mode="TwoWay" NotifyOnSourceUpdated="True" NotifyOnTargetUpdated="True" UpdateSourceTrigger="PropertyChanged">
                            <Binding Path="ROI.Begin.PosV" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged"   NotifyOnSourceUpdated="True" NotifyOnTargetUpdated="True"/>
                            <Binding Path="ROI.End.PosV" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged"   NotifyOnSourceUpdated="True" NotifyOnTargetUpdated="True" />
                            <Binding Path="DataContext.UsedCoordinateSystem" RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type UserControl}}" NotifyOnSourceUpdated="True" Mode="TwoWay" NotifyOnTargetUpdated="True" UpdateSourceTrigger="PropertyChanged"/>
                        </MultiBinding>
                    </Rectangle.Height>
                    <Rectangle.Fill>#33FF0000</Rectangle.Fill>
                    <Rectangle.Stroke>#FF00FF00</Rectangle.Stroke>
                    <Rectangle.IsHitTestVisible>true</Rectangle.IsHitTestVisible>
                </Rectangle>

包含所有数据的列表视图：

<ListView ItemsSource="{Binding Rectangles, Mode=TwoWay, NotifyOnTargetUpdated=True, NotifyOnSourceUpdated=True, NotifyOnValidationError=True, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True, ValidatesOnExceptions=True}"   x:Name="listBox" Width="{Binding ActualWidth, ElementName=ImageControl, Mode=OneWay,UpdateSourceTrigger=PropertyChanged}" Height="{Binding ActualHeight, ElementName=ImageControl, Mode=OneWay,UpdateSourceTrigger=PropertyChanged}" Background="{x:Null}" BorderBrush="{x:Null}" Foreground="{x:Null}" ItemTemplate="{StaticResource RectangleWithLabel}" MouseMove="ListBox_MouseMove" DataContextChanged="ListBox_DataContextChanged" SourceUpdated="ListBox_SourceUpdated" IsSynchronizedWithCurrentItem="True" TargetUpdated="ListBox_TargetUpdated"  />

父级对ImageViewer的调用，此处是在前往ImageViewer的途中调用转换器，但从不调用ConvertBack：

        <common:ImageViewer x:Name="ctrlImage" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" >
            <common:ImageViewer.DataContext>
                <MultiBinding Converter="{StaticResource ConverterWhichIsOnlyCalledOneWay}" Mode="TwoWay" NotifyOnSourceUpdated="True" NotifyOnTargetUpdated="True" UpdateSourceTrigger="PropertyChanged">
                    <Binding Path="." UpdateSourceTrigger="PropertyChanged" Mode="TwoWay" NotifyOnSourceUpdated="True" NotifyOnTargetUpdated="True"/>
                </MultiBinding>
            </common:ImageViewer.DataContext>
        </common:ImageViewer>

我该如何ConvertBack打电话？

编辑：

我对控件和转换器进行了概述。我想我错了，应该调用ConvertBack，即使没有大型转换器，一切都在更新。但是在向中添加一些元素时我仍然卡住了ObservableCollection。当我添加一些值时，这些值会出现在MainWindow的DataContext中。但是转换器不会触发。当我将Observable.Countas绑定添加到Big Converter时，触发了更新，但是所有绑定都丢失了。

与原始代码相比，更改为：将所有内部变量更改为DependencyProperties，这使得更新对于中的单个条目可靠ObservableCollection。

GUI和使用的转换器概述