WPF 用户控件属性绑定 [英] WPF UserControl property binding

问题描述

我正在尝试创建一个包含 2 个按钮的 WPF UserControl.我在一个窗口中使用这个 UserControl 并应用一个 Window.Resource 值来设置用户控件内一个按钮的背景.

I'm trying to create a WPF UserControl which contains 2 buttons. I use this UserControl in a Window and apply a Window.Resource value to set the background of one button inside the user control.

目前我有:

• window.xaml

• window.xaml

<Window.Resources>
    <SolidColorBrush Color="Brown" x:Key="theBG"></SolidColorBrush>
</Window.Resources>
<theControl:TheControl  
    x:Name="TheControl" 
    buttonBG="{Binding Source={StaticResource theBG}}" />

usercontrol.xaml.cs

usercontrol.xaml.cs

public SolidColorBrush buttonBG
{
    get { return base.GetValue(buttonBGProperty) as SolidColorBrush; }
    set { base.SetValue(buttonBGProperty, value); }
}
public static readonly DependencyProperty buttonBGProperty = DependencyProperty.Register("buttonBG", typeof(SolidColorBrush), typeof(DataPanel), null);

usercontrol.xaml

usercontrol.xaml

<Button ... Background="{Binding buttonBG}">

我原以为这会起作用，但背景不是我在窗口资源中设置的背景.

I was expecting this to work but the background is not the one I set in the window resource.

我做错了什么?

推荐答案

Background="{Binding buttonBG}"

暗示您更改了 UserControl 的 DataContext，您永远不应该.或者绑定错误.

Implies either that you changed the DataContext of the UserControl, which you should never do. Or that the binding is just wrong.

使用

Background="{Binding buttonBG, ElementName=control}"

命名您的 UserControl 根元素 control.RelativeSource 也能正常工作.

Naming your UserControl root element control. RelativeSource works as well.

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