如何通过 XAML 在 WPF 中将小写转换为大写？
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How to convert lower case to upper case in WPF by XAML?
提问by Chandru A
I tried to convert upper case to lower case by XAML in WPF like below:
我尝试在 WPF 中通过 XAML 将大写转换为小写，如下所示：
<TextBox Height="86" CharacterCasing="Upper"/>
I want to achieve the same scenario with TextBlock, Labeland Button.
我想用TextBlock,Label和实现相同的场景Button。
How can I do it?
我该怎么做？
回答by David Blurton
You should use a value converter:
您应该使用值转换器：
public class ToUpperValueConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
var str = value as string;
return string.IsNullOrEmpty(str) ? string.Empty : str.ToUpper();
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
return null;
}
}
回答by Ramin
One way is to do this is to use NotifyOnTargetUpdatedand handle TextChangedevent.
一种方法是使用NotifyOnTargetUpdated和处理TextChanged事件。
XAML
XAML
<TextBlock Name="TB" Text="{Binding Path=YourProperty, NotifyOnTargetUpdated=True}"
TargetUpdated="TB_TargetUpdated" />
Code behind
背后的代码
private void TB_TargetUpdated(object sender, DataTransferEventArgs e)
{
TB.Text = TB.Text.ToUpper();
}
回答by Qortex
Just take a look at that: How to make all text upper case / capital?.
看看那个：如何使所有文本大写/大写？.
More generally, each time you want to transform a value to go into a control, think of a converter and write it yourself (or use it if it already exists).
更一般地说，每次你想把一个值转换成一个控件时，考虑一个转换器并自己编写它（或者如果它已经存在就使用它）。
You can find additional documentation on converters here: http://wpftutorial.net/ValueConverters.html.
您可以在此处找到有关转换器的其他文档：http: //wpftutorial.net/ValueConverters.html。
