WPF TextBox 触发器以清除文本

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>