How to convert pressed key into upper case letter in WPF, rich text box?

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Hi I am working on a computer application. I want to provide user to select upper case from combobox and when he type, the font in rich text box convert into uppercase. The final typed document will consist mixture of few lines in uppercase and few lines in lower case.

I am new to wpf, c#. In text box there is option for character casing but could not able to get a solution for richtextbox wpf.

What I have tried:

C#

I have tried with in textbox. There is charactercasing. But no such thing in wpf rich text box.

Posted 7-Nov-16 16:00pm

Member 12837938

Updated 8-Nov-16 9:32am

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[no name] 8-Nov-16 6:54am

ToUpper()

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Henrik Jonsson · Accepted Answer · 2016-11-08T09:32:00

It is not easy but by registering the following TextChanged event handler I got the code below to convert every input to uppercase. If you add code to check your combobox selection you might get it to work.

C#

private void RichTextBox_TextChanged(object sender, TextChangedEventArgs e)
{
    var textBox = (RichTextBox)sender;

    var docStart = textBox.Document.ContentStart.DocumentStart;
    foreach ( var change in e.Changes )
    {
        if( change.AddedLength > 0 )
        {
            var changeStart = docStart.GetPositionAtOffset(change.Offset, LogicalDirection.Forward);
            var changeEnd =   docStart.GetPositionAtOffset(change.Offset+change.AddedLength, LogicalDirection.Forward);
            var changedRange = new TextRange(changeStart, changeEnd);
            var currentText = changedRange.Text;
            var upperText = currentText.ToUpper();
            if( upperText != currentText )
            {
                changedRange.Text = upperText;
                Debug.Print("Replaced " + currentText);
            }
            textBox.Selection.Select(changeEnd, changeEnd);
        }
    }

}