wpf 按钮内容中的样式 DataTrigger Setter 无效
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Style DataTrigger Setter in Button Content is invalid
提问by JerryBaxia
<StackPanel>
<TextBox Text="" x:Name="input"/>
<Button Content="DataTrigger Before">
<Button.Style>
<Style TargetType="Button">
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=input, Path=Text}" Value="1">
<Setter Property="Content" Value="Changed"></Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
</StackPanel>
Style DataTrigger Setter in Button Content is invalid
按钮内容中的样式 DataTrigger Setter 无效
Thanks
谢谢
回答by stukselbax
Your DataTriggeris not change the value of the Contentproperty because you set it inside the Buttondeclaration. So, once setted, it will never changed. To allow changing, you have to set the value inside the Style.
您的DataTrigger不会更改该Content属性的值，因为您将其设置在Button声明中。所以，一旦设定，就永远不会改变。要允许更改，您必须在Style 中设置值。
This will works (I've tried):
这会起作用（我试过）：
<StackPanel>
<TextBox Name="input"/>
<Button>
<Button.Style>
<Style TargetType="Button">
<Setter Property="Content" Value="DataTrigger Before"></Setter>
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=input, Path=Text}" Value="1">
<Setter Property="Content" Value="Changed"></Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
</StackPanel>
