WPF中的用法DataTrigger [英] Usage DataTrigger in WPF

问题描述

我在XAML中定义了TextBox控件，并且我想根据其IsReadOnly或IsEnabled属性将不同的背景色应用于TextBox.我使用dataTriggers实际上在颜色之间进行切换，如下所示:

I have a TextBox control defined in XAML and I want to apply different background colors to the TextBox based on its IsReadOnly or IsEnabled properties. I used dataTriggers to actually switch between the colors as shown below:

<Style x:Key="TextBoxStyle" TargetType="TextBox">
    <Style.Triggers>
        <DataTrigger Binding="{Binding IsEnabled}" Value="True">
            <Setter Property="TextBox.Background" Value="Yellow"/>
        </DataTrigger>
        <DataTrigger Binding="{Binding IsReadOnly}" Value="True">
            <Setter Property="TextBox.Background" Value="Red"/>
        </DataTrigger>
        <MultiDataTrigger>
            <MultiDataTrigger.Conditions>
                <Condition Binding="{Binding IsReadOnly}" Value="True"/>
                <Condition Binding="{Binding IsEnabled}" Value="True"/>
            </MultiDataTrigger.Conditions>
            <Setter Property="Background" Value="Green"/>
        </MultiDataTrigger>
    </Style.Triggers>
</Style>

文本框的定义如下所示:

And the TextBox is defined as shown below:

  <TextBox Name="sourceTextBox"  Margin="5,3,5,3" IsReadOnly="True" Style="{StaticResource TextBoxStyle}" />

但是问题是，颜色没有正确应用.

But the problem is, the colors are not being applied properly.

上述方法是否有问题?

推荐答案

我认为您只需要在绑定中添加RelativeSource={RelativeSource Self}:

I think you need just need to add RelativeSource={RelativeSource Self} to your bindings:

<Style x:Key="TextBoxStyle" TargetType="{x:Type TextBox}">
    <Style.Triggers>
        <DataTrigger Binding="{Binding IsEnabled, RelativeSource={RelativeSource Self}}" Value="True">
            <Setter Property="Background" Value="Yellow" />
        </DataTrigger>
        <DataTrigger Binding="{Binding IsReadOnly, RelativeSource={RelativeSource Self}}" Value="True">
            <Setter Property="Background" Value="Red" />
        </DataTrigger>
        <MultiDataTrigger>
            <MultiDataTrigger.Conditions>
                <Condition Binding="{Binding IsReadOnly, RelativeSource={RelativeSource Self}}" Value="True"/>
                <Condition Binding="{Binding IsEnabled, RelativeSource={RelativeSource Self}}" Value="True"/>
            </MultiDataTrigger.Conditions>
            <Setter Property="Background" Value="Green"/>
        </MultiDataTrigger>
    </Style.Triggers>
</Style>

但是仍然存在一个问题，我不相信您会看到红色背景，因为具有IsEnabled属性设置为False的TextBox在其控件模板中具有内置背景色，它将优先于样式触发器的触发器设置器.

There is still one problem however, I don't believe you will ever see a Red background because a TextBox with its IsEnabled property set to False has a built in background color into its control template that will take priority over your style's trigger's setter.

我认为您必须重新定义其控件模板才能在禁用TextBox时更改背景颜色.

I think you'd have to redefine its control template to change the background color when the TextBox is disabled.

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