为什么现在AdornedElement.(Validation.Errors).CurrentItem.ErrorContent(VS2017 15.4)会导致智能感知错误? [英] Why does AdornedElement.(Validation.Errors).CurrentItem.ErrorContent now (VS2017 15.4) cause intellisense errors?
问题描述
很长一段时间以来,我一直在使用以下错误装饰模板:
<ControlTemplate x:Key="ErrorAdornerTemplateStyle" TargetType="{x:Type Control}">
<Grid ClipToBounds="False" >
<Border BorderBrush="Red" BorderThickness="2" Margin="-1"
ToolTip="{Binding ElementName=adornedElement, Path=AdornedElement.(Validation.Errors).CurrentItem.ErrorContent }">
<AdornedElementPlaceholder Name="adornedElement" />
</Border>
<Polygon Points="15,15 15,0 0,0"
Fill="Red"
HorizontalAlignment="Right"
VerticalAlignment="Top"
ToolTip="{Binding ElementName=adornedElement, Path=AdornedElement.(Validation.Errors).CurrentItem.ErrorContent }"/>
</Grid>
</ControlTemplate>
...,它在运行时就可以正常工作(据我所知).
但是,在过去一个月对VS,WPF和NET Standard 2进行了一系列升级之后,我注意到syles xaml文件中的intellisense给我CurrentItem
标识符以下错误:>
在类型'ReadOnlyObservableCollection'中找不到属性'CurrentItem'.
这只是一个令人讨厌的VS错误还是VS提醒我一些我需要适应的WPF子系统更改?
ReadOnlyObservableCollection
本身不公开CurrentItem
属性.相反,CurrentItem
是CollectionView
的概念,是在WPF中绑定项目集合时在内部创建的.
有一些访问CurrentItem
的特殊支持的集合,方法是在绑定路径中使用/
.
将绑定路径更改为Path=AdornedElement.(Validation.Errors)/ErrorContent
以利用此支持.
I've been using the following error adorner template for a long time now:
<ControlTemplate x:Key="ErrorAdornerTemplateStyle" TargetType="{x:Type Control}">
<Grid ClipToBounds="False" >
<Border BorderBrush="Red" BorderThickness="2" Margin="-1"
ToolTip="{Binding ElementName=adornedElement, Path=AdornedElement.(Validation.Errors).CurrentItem.ErrorContent }">
<AdornedElementPlaceholder Name="adornedElement" />
</Border>
<Polygon Points="15,15 15,0 0,0"
Fill="Red"
HorizontalAlignment="Right"
VerticalAlignment="Top"
ToolTip="{Binding ElementName=adornedElement, Path=AdornedElement.(Validation.Errors).CurrentItem.ErrorContent }"/>
</Grid>
</ControlTemplate>
... and it works at run-time just fine (as far as I can tell).
However, after a flurry of upgrades to VS and WPF and NET Standard 2 in the past month, I've noticed that the intellisense in my syles xaml file is giving me the following error for the CurrentItem
identifier:
The property 'CurrentItem' was not found in type 'ReadOnlyObservableCollection'.
Is this just a nuisance VS bug or is VS alerting me to some kind of change in the WPF subsystem that I need to adapt to?
The ReadOnlyObservableCollection
itself doesn't expose a CurrentItem
property. Instead, the CurrentItem
is a concept of the CollectionView
that is internally created when a collection of items is bound in WPF.
There is some special support to access the CurrentItem
of a collection by using /
in the binding path.
Change the binding path to Path=AdornedElement.(Validation.Errors)/ErrorContent
to utilize this support.
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