在DataTemplate中的VisualBrush不会重新绘制

I have a ListView to display attachments and each attachment has a delete button. When I change the ItemSource for the list (i.e. when viewing another item that has different attachments), the icon for the delete button no longer draws.

我有一个ListView来显示附件，每个附件都有一个delete按钮。当我更改列表的ItemSource时(例如，当查看另一个具有不同附件的项目时)，delete按钮的图标将不再绘制。

Here's the template

这是模板

   <DataTemplate x:Key="attachmentListData">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto"/>
                    <ColumnDefinition Width="Auto"/>

                </Grid.ColumnDefinitions>
                <Label Grid.Column="0">
                    <TextBlock TextTrimming="CharacterEllipsis" Text="{Binding Path=filename}" TextDecorations="{Binding Path=deleted, Converter={StaticResource deletedStrikethroughConverter}}"  />
                </Label>
                <Button Grid.Column="1" Visibility="{Binding Path=deleted, Converter={StaticResource attachmentDeleteButtonVisibilityConverter}}" Style="{DynamicResource MetroCircleButtonStyle}" Width="40" Height="40" Click="onDeleteAttachmentClicked">
                    <Rectangle Fill="Black" Width="15" Height="15">
                        <Rectangle.OpacityMask>
                            <VisualBrush Visual="{StaticResource appbar_close}" Stretch="Fill" />
                        </Rectangle.OpacityMask>
                    </Rectangle>
                </Button>
            </Grid>
        </DataTemplate>

I've been able to work around the issue by having the appbar_close icon drawn somewhere else in the screen, but having the visibility set to hidden. If the icon isn't somewhere else in the screen, after I change the ItemSource the icon will stop drawing.

我可以通过在屏幕的其他地方绘制appbar_close图标来解决这个问题，但是要将可视性设置为隐藏。如果图标不在屏幕的其他位置，在我更改ItemSource后，图标将停止绘图。

Obviously this workaround is hacky, but what is the better way to ensure that the icon still shows up?

显然，这个解决方案很容易出错，但是有什么更好的方法可以确保图标仍然显示?

2 个解决方案

#1

I think you are missing the DataType property on the DataTemplate. http://msdn.microsoft.com/en-us/library/system.windows.datatemplate.datatype.aspx. I'd be surprised if this was not giving you a binding error on the line where you're binding button Visibility.

我认为您丢失了DataTemplate上的DataType属性。http://msdn.microsoft.com/en-us/library/system.windows.datatemplate.datatype.aspx。如果没有在绑定按钮可见性的行上给您一个绑定错误，我将会感到惊讶。

#2

You can set x:Shared=False in appbar_close and also you should use PresentationOptions:Freeze, RenderOptions for performance.

您可以在appbar_close中设置x:Shared=False，还应该使用PresentationOptions:Freeze, RenderOptions来实现性能。

Hope it helps.

希望它可以帮助。

#1

#2