wpf 如何从触发器绑定到另一个控件的属性？
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How do I bind to another control's property from a trigger?
提问by rrhartjr
In my particular case, I want to bind to the IsReadOnly property of a TextBox to set the Content property of a Button? They are both part of the same StackPanel.
在我的特定情况下，我想绑定到 TextBox 的 IsReadOnly 属性来设置 Button 的 Content 属性？它们都是同一个 StackPanel 的一部分。
I've tried doing it with a DataTrigger with a Binding to the ElementName of the TextBox and a Trigger using the TextBox name as the SourceName.
我已经尝试使用 DataTrigger 与 TextBox 的 ElementName 绑定和使用 TextBox 名称作为 SourceName 的触发器。
Any thoughts?
有什么想法吗？
回答by itowlson
You need to specify the trigger as part of a style -- the Triggers collection on the Button itself can only contain event triggers. With that in mind, a DataTrigger works fine. However, there is a wrinkle: the value from the Trigger Setter won't overwrite a local Content property. So you have to set the default Content in the Style as well. Here's how it looks:
您需要将触发器指定为样式的一部分——Button 本身的 Triggers 集合只能包含事件触发器。考虑到这一点，DataTrigger 工作正常。但是，有一个问题：来自 Trigger Setter 的值不会覆盖本地 Content 属性。因此，您还必须在样式中设置默认内容。这是它的外观：
<Button> <!-- Note no content set directly on button -->
<Button.Style>
<Style TargetType="Button">
<Setter Property="Content" Value="You may write!!!" /> <!-- Here is the 'normal' content -->
<Style.Triggers>
<!-- Here is how we bind to another control's property -->
<DataTrigger Binding="{Binding IsReadOnly, ElementName=textBox}" Value="True">
<Setter Property="Content" Value="NO NO NO" /> <!-- Here is the 'override' content -->
</DataTrigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
回答by Mark
Have you tried this:
你有没有试过这个：
<StackPanel x:Name="LayoutRoot">
<Button Width="75" Content="{Binding IsReadOnly, ElementName=textBox, Mode=Default}" />
<TextBox x:Name="textBox" VerticalAlignment="Top" Text="TextBox" />
</StackPanel>
??
??
