How to make all text upper case / capital?

Question

I want all texts in TextBlock, Label, MenuItem.Header to be displayed in upper case. The strings are taken from a ResourceDictio

Answer 1

I created an attached property and converter for this. You probably already have the converter, so replace my reference to CaseConverter to whatever implementation you have.

The attached property is just a boolean that you set if you want it to be uppercase (you could obviously extend this to instead be an enumerable for a selection of styles). When the property changes, it rebinds the TextBlock's Text property as needed, adding in the converter.

A little more work might need to be done when the property is already bound - my solution assumes it's a simple Path binding. But it may need to also duplicate the source, etc. However I felt this example is enough to get my point across.

Here's the attached property:

public static bool GetUppercase(DependencyObject obj)
    {
        return (bool)obj.GetValue(UppercaseProperty);
    }

    public static void SetUppercase(DependencyObject obj, bool value)
    {
        obj.SetValue(UppercaseProperty, value);
    }

    // Using a DependencyProperty as the backing store for Uppercase.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty UppercaseProperty =
        DependencyProperty.RegisterAttached("Uppercase", typeof(bool), typeof(TextHelper), new PropertyMetadata(false, OnUppercaseChanged));

    private static void OnUppercaseChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        TextBlock txt = d as TextBlock;

        if (txt == null) return;

        var val = (bool)e.NewValue;

        if (val)
        {
            // rebind the text using converter
            // if already bound, use it as source

            var original = txt.GetBindingExpression(TextBlock.TextProperty);

            var b = new Binding();

            if (original != null)
            {
                b.Path = original.ParentBinding.Path;
            }
            else
            {
                b.Source = txt.Text;
            }

            b.Converter = new CaseConverter() { Case = CharacterCasing.Upper };


            txt.SetBinding(TextBlock.TextProperty, b);
        }
    }