如何从 wpf 中的样式绑定到标签？
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How can I bind to tag from style in wpf?
提问by Siarhei Kuchuk
I'm implementing a search textbox; could you please help me with binding to TextBox.Tag?
我正在实现一个搜索文本框；你能帮我绑定到 TextBox.Tag 吗？
Style
风格
<Style x:Key="SearchTextBox" TargetType="{x:Type TextBox}">
<Style.Resources>
<VisualBrush x:Key="CueBannerBrush" AlignmentX="Left" AlignmentY="Center" Stretch="None">
<VisualBrush.Visual>
<Label Content="{Binding RelativeSource={RelativeSource Mode=Self}, Path=Tag}" Foreground="{StaticResource SearchTextBox.Foreground}" FontSize="{StaticResource SearchTextBox.FontSize}"/>
</VisualBrush.Visual>
</VisualBrush>
</Style.Resources>
<Setter Property="FontSize" Value="{StaticResource SearchTextBox.FontSize}" />
<Setter Property="Foreground" Value="{StaticResource SearchTextBox.TextForeground}" />
<Setter Property="MinWidth" Value="200" />
<Style.Triggers>
<Trigger Property="Text" Value="{x:Static sys:String.Empty}">
<Setter Property="Background" Value="{StaticResource CueBannerBrush}" />
</Trigger>
<Trigger Property="Text" Value="{x:Null}">
<Setter Property="Background" Value="{StaticResource CueBannerBrush}" />
</Trigger>
<Trigger Property="IsKeyboardFocused" Value="True">
<Setter Property="Background" Value="White" />
</Trigger>
</Style.Triggers>
</Style>
Usage
用法
<TextBox Style="{StaticResource SearchTextBox}" Tag="Search templates" />
How can I get the binding to work?
我怎样才能让绑定工作？
采纳答案by Bill Tarbell
This article here is extremely similar to yours: WPF Bind to parent property from within nested element using style
此处的这篇文章与您的非常相似：WPF 使用样式从嵌套元素内绑定到父属性
Though, it doesn't really give a code sample, so here's some xaml you can use as an alternative to your current approach.
不过，它并没有真正提供代码示例，因此这里有一些 xaml，您可以将其用作当前方法的替代方法。
<Style x:Key="SearchTextBox" BasedOn="{StaticResource {x:Type TextBox}}" TargetType="{x:Type TextBox}">
<Style.Setters>
<Setter Property="Tag" Value=""/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TextBox}">
<Grid>
<ScrollViewer x:Name="PART_ContentHost" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
<TextBlock x:Name="textBlock" Opacity="0.345" Text="{TemplateBinding Tag}" TextWrapping="Wrap" Visibility="Hidden" />
</Grid>
<ControlTemplate.Triggers>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsFocused" Value="False" />
<Condition Property="Text" Value="" />
</MultiTrigger.Conditions>
<Setter Property="Visibility" TargetName="textBlock" Value="Visible" />
</MultiTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style.Setters>
</Style>
And you'll still write your textbox code the same way you already had it:
你仍然会像你已经拥有的一样编写你的文本框代码：
<TextBox Style="{StaticResource SearchTextBox}" Tag="Search templates" />
