如何在Expander中动态更改矩形颜色? [英] how to dynamically change rectangle color in Expander?

问题描述

我有一个扩展器，其中的矩形带有颜色.我想在某些功能后进行动态更改.如何在运行时更改它?

I have an Expander in which i have Rectangle with color. i want to change dynamically after some functionality. how to change it on run time ?

 <Windows.Resources>

    <ControlTemplate x:Key="SimpleExpanderButtonTemp" 
         TargetType="{x:Type ToggleButton}">
    <Border x:Name="ExpanderButtonBorder"
        Background="{TemplateBinding Background}"
        BorderBrush="{TemplateBinding BorderBrush}"
        BorderThickness="{TemplateBinding BorderThickness}"
        Padding="{TemplateBinding Padding}"
        >
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>

        <Rectangle x:Name="ExpandRect" Fill="Transparent"
                   Grid.ColumnSpan="2"/>

        <Ellipse Name="Circle"
             Grid.Column="0"
             Stroke="DarkGray"
             Width="20"
             Height="20"
             HorizontalAlignment="Center"
             VerticalAlignment="Center"
             />

    </Grid>
</Border>
</>
</Windows.Resources>

任何人的帮助:

推荐答案

如果要在后面的代码中进行更改，我将使用{DynamicResource key}绑定绑定到画笔资源.然后，您后面的代码可以将该资源更新为所需的任何位置.

If you want to change this in code behind, I would bind to a brush resource using {DynamicResource key} binding. Your code behind can then update that resource to whatever you want where ever you need it to.

this.Resource["RectangleBrush"] = new SolidColorBrush(Colors.Red);

如果要通过视图模型中的数据控制它，请使用数据触发器.

If you want to control it via data in a view model, use a datatrigger. Link to similar answer

如果您基于多个绑定-您可以在转换器中使用多重绑定:

If you're basing it on multiple bindings - you can use a multibinding with a converter : Tutorial here

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