WPF TextBox 触发器以清除文本
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WPF TextBox trigger to clear Text
提问by PaN1C_Showt1Me
I have many TextBoxcontrols and I'm trying to write a style that clears the Textproperty whenthe Control is disabled.
I don't want to have Event Handlers in code behind.
我有很多TextBox控件，我正在尝试编写一种样式，在禁用控件时清除 Text属性。我不想在后面的代码中使用事件处理程序。
I wrote this:
我写了这个：
<Style TargetType="{x:Type TextBox}">
<Style.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Text" Value="{x:Null}" />
</Trigger>
</Style.Triggers>
</Style>
The problem is that if the TextBox is defined like:
问题是，如果 TextBox 被定义为：
<TextBox Text={Binding Whatever} />
then the trigger does not work (probably because it's bound) How to overcome this problem?
那么触发器不起作用（可能是因为它被绑定了）如何克服这个问题？
回答by Matt Hamilton
Because you're explicitly setting the Text in the TextBox, the style's trigger can't overwrite it. Try this:
因为您在 TextBox 中显式设置了 Text，所以样式的触发器不能覆盖它。尝试这个：
<TextBox>
<TextBox.Style>
<Style TargetType="{x:Type TextBox}">
<Setter Property="Text" Value="{Binding Whatever}" />
<Style.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Text" Value="{x:Null}" />
</Trigger>
</Style.Triggers>
</Style>
</TextBox.Style>
</TextBox>
