WPF TextBox 触发器以清除文本 [英] WPF TextBox trigger to clear Text
本文介绍了WPF TextBox 触发器以清除文本的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有许多 TextBox
控件,我正在尝试编写一种样式,该样式清除 Text 属性当控件为 禁用.我不想在代码中包含事件处理程序.
I have many TextBox
controls and I'm trying to write a style that clears the Text property when the Control is disabled.
I don't want to have Event Handlers in code behind.
这是我写的:
<Style TargetType="{x:Type TextBox}">
<Style.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Text" Value="{x:Null}" />
</Trigger>
</Style.Triggers>
</Style>
问题是,如果 TextBox 的定义如下:
The problem is that if the TextBox is defined like:
<TextBox Text={Binding Whatever} />
然后触发器不起作用(可能是因为它被绑定了)如何克服这个问题?
then the trigger does not work (probably because it's bound) How to overcome this problem?
推荐答案
因为您在 TextBox 中显式设置了 Text,所以样式的触发器无法覆盖它.试试这个:
Because you're explicitly setting the Text in the TextBox, the style's trigger can't overwrite it. Try this:
<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>
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