启用或禁用按钮时，如何更改自定义按钮中标签的前景色？答案

【问题标题】：How do I change the Foreground color of a label in a custom button when the button is enabled or disabled?启用或禁用按钮时，如何更改自定义按钮中标签的前景色？
【发布时间】：2014-05-01 21:09:28
【问题描述】：

鉴于以下具有自定义内容的 WPF 按钮，我如何使用触发器将其标签的前景色在启用按钮时更改为蓝色，在禁用时更改为红色？

<Window x:Class="CustomButtonTriggerExample.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <StackPanel VerticalAlignment="Center" HorizontalAlignment="Center">
            <Button IsEnabled="{Binding ElementName=chkEnabled, Path=IsChecked}">
                <StackPanel Orientation="Horizontal">
                    <Label VerticalContentAlignment="Center">This is a label control inside a button</Label>
                    <Image Height="50" Width="50" Source="/CustomButtonTriggerExample;component/Images/Some Image.png" Stretch="Fill" />
                </StackPanel>
            </Button>
            <CheckBox x:Name="chkEnabled">Button Enabled</CheckBox>
        </StackPanel>
    </Grid>
</Window>

【问题讨论】：

标签： wpf button triggers styles isenabled

【解决方案1】：

<Window x:Class="CustomButtonTriggerExample.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <StackPanel VerticalAlignment="Center" HorizontalAlignment="Center">
            <Button IsEnabled="{Binding ElementName=chkEnabled, Path=IsChecked}">
                <Button.Resources>
                    <Style TargetType="Label">
                        <Style.Triggers>
                            <DataTrigger Binding="{Binding RelativeSource={RelativeSource AncestorType={x:Type Button}}, Path=IsEnabled}" Value="False">
                                <Setter Property="Foreground" Value="Red" />
                            </DataTrigger>
                            <DataTrigger Binding="{Binding RelativeSource={RelativeSource AncestorType={x:Type Button}}, Path=IsEnabled}" Value="True">
                                <Setter Property="Foreground" Value="Blue"/>
                            </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </Button.Resources>

                <StackPanel Orientation="Horizontal">
                    <Label VerticalContentAlignment="Center">This is a label control inside a button</Label>
                    <Image Height="50" Width="50" Source="/CustomButtonTriggerExample;component/Images/Some Image.png" Stretch="Fill" />
                </StackPanel>
            </Button>
            <CheckBox x:Name="chkEnabled">Button Enabled</CheckBox>
        </StackPanel>
    </Grid>
</Window>

【讨论】：

这两个州都不需要DataTrigger。您可以使用Setter 将Foreground 设置为蓝色，然后触发 Button.IsEnabed == false 并将其设置为红色。