How do I change the font of selected text or all text in a rich text box

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I'm working on a text editor and the one button i use is to change the font type and size of all the text in in a richtextbox and if you select something only that text should change with the fontDialog..The code i have at the moment i can select text and change the selected text's style and then continue typing with the original font type i started with..i just need help with the code i can you use to change all the text if nothing is selected/higlighted

What I have tried:

C#

if (fontDialog1.ShowDialog() == DialogResult.OK & !String.IsNullOrEmpty(rtbText.Text))
{
                
  rtbText.SelectionFont = fontDialog1.Font;
}

Posted 14-Aug-17 1:46am

DreyerVorster

Updated 14-Aug-17 3:51am

Leo Chapiro

v2

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2 solutions

Solution 1

You can select all the text before changing SelectedFont:

rtbText.SelectAll();
rtbText.SelectionFont = fontDialog1.Font;

Posted 14-Aug-17 2:03am

Leo Chapiro

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BillWoodruff · Accepted Answer · 2017-08-14T03:51:00

I've used this in the past; it handles the case of all-selected in the same way as none-selected. And, you can, optionally, reset the selection after the Font change.

private void SetFont(RichTextBox rtbx, bool restoreselection = false)
{
    int selStart = rtbx.SelectionStart;
    int selLength = rtbx.SelectionLength;

    if (fontDialog1.ShowDialog() == DialogResult.OK)
    {
        if (selLength == 0) rtbx.SelectAll();

        rtbx.SelectionFont = fontDialog1.Font;

        if (restoreselection)
        {
            rtbx.Focus();
            rtbx.SelectionStart = selStart;
            rtbx.SelectionLength = selLength;
        }
    }
}