WPF

Question

我在 ResourceDictionary 文件中有以下样式

<Color x:Key="LightCyan">LightCyan</Color>
<SolidColorBrush x:Key="LightCyanBrush" Color="{StaticResource LightCyan}" />

<Style x:Key="TextBoxStyle" TargetType="TextBox">
    <Setter Property="Width" Value="150" />
    <Setter Property="Margin" Value="0,0,0,3" />
</Style>

<Style TargetType="TextBox" BasedOn="{StaticResource TextBoxStyle}">
    <Style.Triggers>
        <Trigger Property="IsReadOnly" Value="False">
            <!-- Change brush color at run time -->
            <Setter Property="Background" Value="{StaticResource LightCyanBrush}" />
        </Trigger>
    </Style.Triggers>
</Style>

我需要在 IsReadOnly = False 和运行时从颜色十六进制代码更改文本框背景颜色。

Answer 1

最简单的方法是使用 DynamicResource 而不是 StaticResource，例如：

<Window.Resources>
    <SolidColorBrush x:Key="TextBoxEditableBackgroundBrush"
                     Color="LightCyan" />
    <Style x:Key="TextBoxStyle"
           TargetType="TextBox">
        <Setter Property="Width"
                Value="150" />
        <Setter Property="Margin"
                Value="0,0,0,3" />
    </Style>
    <Style TargetType="TextBox"
           BasedOn="{StaticResource TextBoxStyle}">
        <Style.Triggers>
            <Trigger Property="IsReadOnly"
                     Value="False">
                <!-- Change brush color at run time -->
                <Setter Property="Background"
                        Value="{DynamicResource TextBoxEditableBackgroundBrush}" /> <!-- note here -->
            </Trigger>
        </Style.Triggers>
    </Style>
</Window.Resources>

然后在代码中你只需更改画笔：

var brush = new SolidColorBrush(Colors.Red);
brush.Freeze();
this.Resources["TextBoxEditableBackgroundBrush"] = brush;

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c#

resourcedictionary