wpf 如何在代码隐藏中访问在 XAML 中创建的 DataContext 类实例？
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How to access DataContext class instance created in XAML in codebehind?
提问by iAteABug_And_iLiked_it
MyDatais a class simply storing a ColorNameproperty.
MyData是一个简单地存储ColorName属性的类。
In XAML I can create an instance for my XAML datacontext by
在 XAML 中，我可以通过以下方式为我的 XAML 数据上下文创建一个实例
<c:MyData x:Key="myDataSource">
Now,
现在，
How do I access and change the ColorName stored in this instance of MyData (which was created in XAML with "myDataSource" key) in my code behind?
如何在后面的代码中访问和更改存储在此 MyData 实例（使用“myDataSource”键在 XAML 中创建）中存储的 ColorName？
I hope the question is clear. I 'd like to change the color programmatically. How do I get hold of the MyData class instance ? Thank you
我希望这个问题很清楚。我想以编程方式更改颜色。如何获取 MyData 类实例？谢谢
<DockPanel
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:c="clr-namespace:SDKSample">
<DockPanel.Resources>
<c:MyData x:Key="myDataSource"/>
</DockPanel.Resources>
<DockPanel.DataContext>
<Binding Source="{StaticResource myDataSource}"/>
</DockPanel.DataContext>
<Button Background="{Binding Path=ColorName}"
Width="150" Height="30">I am bound to be RED!</Button>
</DockPanel>
回答by PoweredByOrange
To access a resource from code-behind, give the DockPanela name and then:
要从代码隐藏访问资源，请提供DockPanel名称，然后：
var resource = dockPanel.Resources["myDataSource"];
Alternatively, you can get its DataContext:
或者，您可以获取其 DataContext：
var dataContext = dockPanel.DataContext as MyData
