WPF：TemplateBinding 到 Shape 的 StrokeThickness 不起作用？
看起来 ControlTemplate 中的以下 Ellipse 没有获取 BorderThickness，但为什么呢？
<Window.Resources>
<ControlTemplate x:Key="EllipseControlTemplate" TargetType="{x:Type TextBox}">
<Grid>
<Ellipse
Width="{TemplateBinding ActualWidth}"
Height="{TemplateBinding ActualHeight}"
Stroke="{TemplateBinding Foreground}"
StrokeThickness="{TemplateBinding BorderThickness}" />
<ScrollViewer Margin="0" x:Name="PART_ContentHost" HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Grid>
</ControlTemplate>
</Window.Resources>
<Grid>
<TextBox
Template="{DynamicResource EllipseControlTemplate}"
Foreground="Green"
BorderThickness="15" />
</Grid>
TemplateBinding 到 Foreground 工作得很好，椭圆是绿色的。但对于 StrokeThickness 它似乎不起作用，为什么？
Looks like the following Ellipse in ControlTemplate does not get the BorderThickness, but why?
<Window.Resources>
<ControlTemplate x:Key="EllipseControlTemplate" TargetType="{x:Type TextBox}">
<Grid>
<Ellipse
Width="{TemplateBinding ActualWidth}"
Height="{TemplateBinding ActualHeight}"
Stroke="{TemplateBinding Foreground}"
StrokeThickness="{TemplateBinding BorderThickness}" />
<ScrollViewer Margin="0" x:Name="PART_ContentHost" HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Grid>
</ControlTemplate>
</Window.Resources>
<Grid>
<TextBox
Template="{DynamicResource EllipseControlTemplate}"
Foreground="Green"
BorderThickness="15" />
</Grid>
TemplateBinding to Foreground works just fine, the ellipse is green. But to StrokeThickness it doesn't seem to work, why?
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另一种可能的解决方案...（因为我喜欢只使用 IValueConverters 作为最后的手段，并且如果您需要将其设置为其他内容，则更改 Ellipse 的 DataContext 可能不起作用）：
这相当于最初的意图（到绑定到 TemplatedParent），但使用长手标记允许您指定路径而不仅仅是属性
Another possible solution ... (because i like to only use IValueConverters as a last resort, and changing the DataContext of the Ellipse might not work if you need it to be set to something else):
This is equivalent to the original intent (to bind to the TemplatedParent), but using the long-hand markup allows you to specify a Path rather than just a property
BorderThickness并不那么容易，它是一个Thickness类型的结构体（并且可以是复合的，如BorderThickness=".0,.0,2,2"），而StrokeThickness属性的类型为double。您需要
IValueConverter才能使此绑定起作用。BorderThicknessis not that easy, it is a struct of typeThickness(and can be composite, likeBorderThickness=".0,.0,2,2"), whileStrokeThicknessproperty is of typedouble.You need
IValueConverterto make this binding work.有一个命名陷阱：
BorderThickness是Thickness的类型，而StrokeThickness是double的类型。所以我们需要IValueConverter。There was naming gotcha:
BorderThicknessis type ofThickness, andStrokeThicknessis type ofdouble. So we needIValueConverter.您还可以使用椭圆的 DataContext 属性：
希望这有帮助！
You can also use the DataContext property of the Ellipse:
Hope this helps!