.net WPF：如何根据 XAML 中另一个文本框的文本属性更改文本框的前景色？
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WPF: How to change the Foreground color of a Textbox depending on the Text property of another in XAML?
提问by Dabblernl
I want to make the Foreground property of a WPF Textbox red as long as its Text property does not match the Text property of another Textbox on the form. I can accomplish this in the code behind and through a binding with a converter. But is there a way to do it in XAML only? (I was thinking of a Trigger of some kind).
我想让 WPF 文本框的 Foreground 属性变为红色，只要它的 Text 属性与表单上另一个文本框的 Text 属性不匹配。我可以在后面的代码中并通过与转换器的绑定来完成此操作。但是有没有办法只在 XAML 中做到这一点？（我在想某种触发器）。
回答by Kent Boogaart
No, you need code. That code could be in a converter:
不，你需要代码。该代码可能在转换器中：
<TextBox x:Name="_textBox1"/>
<TextBox Foreground="{Binding Text, ElementName=_textBox1, Converter={StaticResource ForegroundConverter}}"/>
Or in a view model:
或者在视图模型中：
public string FirstText
{
//get/set omitted
}
public string SecondText
{
get { return _secondText; }
set
{
if (_secondText != value)
{
_secondText = value;
OnPropertyChanged("SecondText");
OnPropertyChanged("SecondTextForeground");
}
}
}
public Brush SecondTextForeground
{
get { return FirstText == SecondText ? Brushes.Red : Brushes.Black; }
}
