是否可以将参数（绑定）传递给 WPF 样式
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Is it possible to pass a parameter (a Binding) to a WPF Style
提问by Joe W
I have a WPF style that I am applying to list box items. Currently, each item is bound to a KeyValuePair. I display the Key in a TextBlock inside the ListBoxItem:
我有一个 WPF 样式，可用于列表框项目。目前，每个项目都绑定到一个 KeyValuePair。我在 ListBoxItem 内的 TextBlock 中显示 Key：
<TextBlock Name="Label" Text="{Binding Key}" />
What I want to do is make the Style generic so that if the data is not a KeyValuePair, (maybe just a string), I can bind the data correctly to the TextBlock.
我想要做的是使 Style 通用，以便如果数据不是 KeyValuePair（可能只是一个字符串），我可以将数据正确绑定到 TextBlock。
Is there a way to pass a parameter to a Style or DataTemplate or make the data binding generic?
有没有办法将参数传递给 Style 或 DataTemplate 或使数据绑定通用？
My style:
我的风格：
<Style x:Key="ListBoxItemStyle" TargetType="ListBoxItem">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListBoxItem">
<Border x:Name="Border" Padding="2" SnapsToDevicePixels="true" CornerRadius="4" BorderThickness="1">
<TextBlock Name="Label" Text="{Binding Key}" />
</Border>
<ControlTemplate.Triggers>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected" Value="True"/>
</MultiTrigger.Conditions>
<Setter TargetName="Border" Property="Background" Value="{StaticResource SelectionGradient}" />
</MultiTrigger>
<ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
采纳答案by Damascus
Let me give you a quick example. Let's say your TextBoxcontains a number, and you want it to be with a red Background if the number is negative, or with a green background if >= 0
让我举一个简单的例子。假设您TextBox包含一个数字，如果数字为负，您希望它带有红色背景，如果 >= 0，则带有绿色背景
Here is the style you'd write:
这是您要编写的样式：
<TextBlock Text="{Binding Key}" >
<TextBlock.Style>
<Style TargetType="TextBox">
<Setter Property="Background" Value="{Binding Key, Converter={StaticResource MyConverterResource}" />
</Style>
</TextBlock.Style>
</TextBlock>
Here is the converter you'd write:
这是您要编写的转换器：
public class MyConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
double source = (double)value;
return source < 0 ? Brushes.Red : Brushes.Green;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
// We don't care about this one here
throw new NotImplementedException();
}
}
And, to access the converter in your xaml, you just have to do the following, assuming your converter is in the namespace MyNamespace:
而且，要访问您的 xaml 中的转换器，您只需执行以下操作，假设您的转换器位于命名空间中MyNamespace：
<Window xmlns:my="clr-namespace:MyNamespace">
<Window.Resources>
<my:MyConverter x:Key="MyConverterResource">
</Window.Resources?
<!-- Your XAML here -->
</Window>
(of course you can put this in any Resources, may it be a UserControlor whatever )
This will allow you to call your converter by writing {StaticResource MyConverterResource}
（当然你可以把它放在 any 中Resources，可以是 aUserControl或其他）这将允许你通过写来调用你的转换器{StaticResource MyConverterResource}
And here, you'd have a conditional style, the converter deciding which color to set as a background according to one parameter, in my case, the value itself (but it can be whatever you want)
在这里，你有一个条件样式，转换器根据一个参数决定将哪种颜色设置为背景，在我的情况下，值本身（但它可以是任何你想要的）
