从代码隐藏更改位于 Window.Resources 中的控件属性

Question

我有一个 WPF window，自定义样式如下：

<Window x:Class="WpfApplication1.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" AllowsTransparency="True" WindowStyle="None" Width="525" Style="{DynamicResource CustomWindowStyle}">
<Window.Resources>
    <Style x:Key="CustomWindowStyle" TargetType="{x:Type Window}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Window}">
                    <Border BorderBrush="Black" BorderThickness="7" Background="{x:Null}" MouseMove="WindowMouseMove" MouseDown="WindowMouseDown">
                            <Grid Background="Transparent" DockPanel.Dock="Top">

                            <!--WPF Control of interest-->
                            <Border x:Name="BORDERCONTROL" HorizontalAlignment="Left" Margin="10,10,0,0" Width="20" Height="20" Background="Black" />
                            <AdornerDecorator>
                            <ContentPresenter/>
                        </AdornerDecorator>
                        </Grid>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</Window.Resources>
<Grid>

</Grid>

我想像这样以编程方式更改 BORDERCONTROL 背景：

private void ChangeBackground()
{
     BORDERCONTROL.Background = Brushes.Yellow;
}

但我无法使用此方法访问此控件。

是否有一种简单的方法可以从代码隐藏更改位于控件模板中的控件属性？

感谢您的帮助。

Answer 1

试试这个：

var bor = (Border)Template.FindName("BORDERCONTROL", this);
bor.Background = Brushes.Yellow;

Answer 2

如果您使用 TemplateBinding，您可以绑定到 Window 的 Background 属性并更改它：

<Style x:Key="CustomWindowStyle" TargetType="{x:Type Window}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Window}">
                    <Border BorderBrush="Black" BorderThickness="7" Background="{x:Null}" 
                            MouseMove="WindowMouseMove" MouseDown="WindowMouseDown">
                            <Grid Background="Transparent" DockPanel.Dock="Top">

                            <!--WPF Control of interest-->
                            <Border x:Name="BORDERCONTROL" HorizontalAlignment="Left" 
                                    Margin="10,10,0,0" Width="20" Height="20" 
                                    Background="{TemplateBinding Background}" />
                            <AdornerDecorator>
                            <ContentPresenter/>
                        </AdornerDecorator>
                        </Grid>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

private void ChangeBackground()
{
     myWindow.Background = Brushes.Yellow;
}

Answer 3

private void Button_Click(object sender, RoutedEventArgs e)
    {
        Border b = (Border)this.Template.FindName("BORDERCONTROL", this);
        b.Background = new SolidColorBrush(Colors.Yellow);
    }

这将为您提供所需的边框控件，并更改其颜色。但是不要尝试在 Window 构造函数中访问 Border，因为它始终为 null。

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