How to convert lower case to upper case in WPF by XAML?

Question

I tried to convert upper case to lower case by XAML in WPF like below:

<TextBox Height="86" CharacterCasing="Upper"/>

I want to achieve the same scenario with TextBlock, Label and Button.

How can I do it?

This is not directly available for a number of controls, You will have create your custom converter and use it. — Ravi Y, Dec 21 '12 at 12:47
ryadavilli, I don't know to create custom converter.Please give me your stuff. — CHANDRA, Dec 21 '12 at 13:01
Why does the question not match its title? lower case ↔ upper case? — Pang, Aug 12 '14 at 01:14

score 9 · Answer 1 · edited Jun 27 '17 at 10:06

9

You should use a value converter:

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;
    }
}

edited Jun 27 '17 at 10:06

Igor Popov

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answered Aug 08 '13 at 10:53

David Blurton

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9

1

would be nice to add how to use it in xaml, especially when binding resources as text. https://stackoverflow.com/a/1762678/2901207 – CularBytes Oct 03 '19 at 15:33

score 3 · Answer 2 · edited Jul 19 '13 at 15:41

3

One way is to do this is to use NotifyOnTargetUpdated and handle TextChanged event.

XAML

<TextBlock Name="TB" Text="{Binding Path=YourProperty, NotifyOnTargetUpdated=True}"
               TargetUpdated="TB_TargetUpdated" />

Code behind

private void TB_TargetUpdated(object sender, DataTransferEventArgs e)
{
   TB.Text = TB.Text.ToUpper();
}

edited Jul 19 '13 at 15:41

Anatoliy Nikolaev

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answered Dec 21 '12 at 15:23

Ramin

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You could do that but its quite case-specific - you would need to do that for every control. Much better to use _value converters_ as **David Button** mentions on this page. Not only are they re-usable but it is the WPF-way of doing things. – Jan 16 '14 at 02:43

score 0 · Answer 3 · edited May 23 '17 at 11:48

0

Just take a look at that: How to make all text upper case / capital?.

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).

You can find additional documentation on converters here: http://wpftutorial.net/ValueConverters.html.

edited May 23 '17 at 11:48

Community

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answered Dec 21 '12 at 13:08

Qortex

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How to convert lower case to upper case in WPF by XAML?

3 Answers3