MSDN列出了TextBox类
here的样式和模板.我可以通过在App.xaml中创建一个ResourceDictionary来覆盖这些主题资源,如下所示：
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.ThemeDictionaries>
<ResourceDictionary x:Key="Default">
<SolidColorBrush x:Key="TextBoxPlaceholderTextThemeBrush" Color="Yellow"/>
</ResourceDictionary>
</ResourceDictionary.ThemeDictionaries>
</ResourceDictionary>
</Application.Resources>
但这会影响我的应用中的每个TextBox.如何仅为特定元素设置此主题？
我已经尝试将这个字典放在Page.Resources甚至TextBox.Resources中,用于我想要应用它的TextBox,但它不起作用.
我真的不想重新定义模板只是为了改变这个属性.
编辑Heena的答案很接近,但我还想为明暗主题设置不同的颜色,因为我的文本框具有透明的背景颜色.
我设法通过将Foreground =“{ThemeResource TextBoxPlaceholderTextThemeBrush}”作为模板的一部分来实现这一目标(因此,换句话说,模板完全是MSDN的默认模板),然后在页面资源中指定：
<Page.Resources>
<ResourceDictionary.ThemeDictionaries>
<ResourceDictionary x:Key="Light">
<SolidColorBrush x:Key="TextBoxPlaceholderTextThemeBrush" Color="Blue"/>
</ResourceDictionary>
...
</ResourceDictionary.ThemeDictionaries>
</Page.Resources>
但这现在意味着我必须在我的页面资源中为文本框放置一个巨大的ControlTemplate样式设置器,这只是默认的完全重复！
这是否与在ControlTemplate中解析TextBoxPlaceholderTextThemeBrush的方式有关？即它发现我的自定义主题词典的原因是因为ControlTemplate是在同一资源字典中定义的？
应该怎么做？我应该只是将文本框子类化,以便将所有XAML移动到另一个文件(即使它仅用于一个文本框)？
假设您使用的是MSDN TextBox
Style
资源
从模板中的Contencontrol中删除前景属性< ContentControl Foreground =“{ThemeResource TextBoxPlaceholderTextThemeBrush}”/>
<Page.Resources>
<!--From MSDN : Default style for Windows.UI.Xaml.Controls.TextBox -->
<Style x:Key="MsdnTextBoxStyle" TargetType="TextBox">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="TextBox">
.....
.....
<ContentControl x:Name="PlaceholderTextContentPresenter"
Grid.Row="1"
Margin="{TemplateBinding BorderThickness}"
Padding="{TemplateBinding Padding}"
IsTabStop="False"
Grid.ColumnSpan="2"
Content="{TemplateBinding PlaceholderText}"
IsHitTestVisible="False"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Page.Resources>
XAML
<StackPanel Orientation="Horizontal">
<TextBox PlaceholderText="PlaceholderText here..." Style="{StaticResource MsdnTextBoxStyle}" Margin="20" Foreground="Red" Height="30" Width="120">
<TextBox.Resources>
<Style TargetType="ContentControl">
<Setter Property="Foreground" Value="Green"/>
</Style>
</TextBox.Resources>
</TextBox>
<TextBox PlaceholderText="PlaceholderText here..." Style="{StaticResource MsdnTextBoxStyle}" Margin="20" Foreground="Red" Height="30" Width="120">
<TextBox.Resources>
<Style TargetType="ContentControl">
<Setter Property="Foreground" Value="Red"/>
</Style>
</TextBox.Resources>
</TextBox>
<TextBox PlaceholderText="PlaceholderText here..." Style="{StaticResource MsdnTextBoxStyle}" Margin="20" Foreground="Red" Height="30" Width="120">
<TextBox.Resources>
<Style TargetType="ContentControl">
<Setter Property="Foreground" Value="Blue"/>
</Style>
</TextBox.Resources>
</TextBox>
</StackPanel>
更新
资源
从模板中的Contencontrol中删除前景属性< ContentControl Foreground =“{ThemeResource TextBoxPlaceholderTextThemeBrush}”/>
<Page.Resources>
<ResourceDictionary>
<ResourceDictionary.ThemeDictionaries>
<ResourceDictionary x:Key="Default">
<SolidColorBrush x:Key="ContentControlForeGround" Color="Red"></SolidColorBrush>
<SolidColorBrush x:Key="ContentControlForeGround1" Color="Yellow"></SolidColorBrush>
</ResourceDictionary>
<ResourceDictionary x:Key="Light">
<SolidColorBrush x:Key="ContentControlForeGround" Color="Blue"></SolidColorBrush>
<SolidColorBrush x:Key="ContentControlForeGround1" Color="SkyBlue"></SolidColorBrush>
</ResourceDictionary>
<ResourceDictionary x:Key="Dark">
<SolidColorBrush x:Key="ContentControlForeGround" Color="Green"></SolidColorBrush>
<SolidColorBrush x:Key="ContentControlForeGround1" Color="Chocolate"></SolidColorBrush>
</ResourceDictionary>
</ResourceDictionary.ThemeDictionaries>
<Style x:Key="TextBoxStyle1" TargetType="TextBox">
.....
<ContentControl x:Name="PlaceholderTextContentPresenter" Grid.ColumnSpan="2" Content="{TemplateBinding PlaceholderText}" IsHitTestVisible="False" IsTabStop="False" Margin="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}" Grid.Row="1"/>
......
</Style>
</ResourceDictionary>
</Page.Resources>
XAML
<StackPanel Orientation="Horizontal">
<TextBox Style="{StaticResource TextBoxStyle1}" PlaceholderText="PlaceholderText here..." Margin="20" Foreground="Red" Height="30" Width="170">
<TextBox.Resources>
<Style TargetType="ContentControl">
<Setter Property="Foreground" Value="{StaticResource ContentControlForeGround}"></Setter>
</Style>
</TextBox.Resources>
</TextBox>
<TextBox Style="{StaticResource TextBoxStyle1}" PlaceholderText="PlaceholderText here..." Margin="20" Foreground="Red" Height="30" Width="170">
<TextBox.Resources>
<Style TargetType="ContentControl">
<Setter Property="Foreground" Value="{StaticResource ContentControlForeGround1}"></Setter>
</Style>
</TextBox.Resources>
</TextBox>
</StackPanel>
