使用 WPF 中的动态资源设置控件背景颜色? [英] Set control Background color using Dynamic Resource in WPF?

问题描述

这是我的 XAML

<Grid.Resources>
            <SolidColorBrush x:Key="DynamicBG"/>
</Grid.Resources>
<Label name="MyLabel" Content="Hello" Background="{DynamicResource DynamicBG} />

所以我有两个问题:

问题 1: 我现在如何将代码中的 DynamicBG 键值设置为 Red?(当窗口加载时，我想将其设置为红色)

Q1: How do I go about setting the DynamicBG key value to Red in my code now? (When the window loads, I'd like to set it to red)

问题 2:动态资源应该这样使用吗?

Q2: Is this how dynamic resources are supposed to be used?

谢谢

推荐答案

要访问代码的 Resource，必须在文件 App.xaml 中标识它们:

To gain access to the Resource of the code must identify them in the file App.xaml:

<Application.Resources>
    <SolidColorBrush x:Key="DynamicBG" />
</Application.Resources>

XAML 示例

<Grid>       
    <Label Name="MyLabel" 
           Content="Hello" 
           Background="{DynamicResource DynamicBG}" />

    <Button Content="Change color"
            Width="100" 
            Height="30" 
            Click="Button_Click" />
</Grid>

Resource 可以在以下形式的代码行中更改:

The Resource can be changed in code line of the form:

Application.Current.Resources["MyResource"] = MyNewValue;

示例:

背后的代码

// using ContentRendered event
private void Window_ContentRendered(object sender, EventArgs e)
{
    SolidColorBrush MyBrush = Brushes.Aquamarine;

    // Set the value
    Application.Current.Resources["DynamicBG"] = MyBrush;         
}

private void Button_Click(object sender, RoutedEventArgs e)
{
    SolidColorBrush MyBrush = Brushes.CadetBlue;

    // Set the value
    Application.Current.Resources["DynamicBG"] = MyBrush;
}

原则，DynamicResources 是设计的，所以它们是可以改变的.在哪里更改 - 这是开发人员的任务.对于Color，它是最常用的方法之一.有关详细信息，请参阅 MSDN.

Principle, DynamicResources were designed, so they can be changed. Where to change - it is the task of the developer. In the case of Color, it is one of the most common methods. See the MSDN, for more information.

P.S.我推荐使用App.xaml，因为曾经有过一个StaticResource被成功使用的情况，但不是DynamicResource(资源放在在 Window.Resources 中).但是在 App.xaml 中移动资源后，一切都开始工作了.

P. S. I recommend using App.xaml, because there have been cases where a StaticResource has been used successfully, but not DynamicResource (resources are placed in the Window.Resources). But after moving the resource in App.xaml, everything started to work.

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