RichTextBox bold, italic and underline functions

Question

Hi peeps.

Here's my problem:

I'm creating a text processing app using a RichTextBox for the editing area. I can easily apply the bold, italic or underline style (or a combination) to sections of text.

Woot!

The problem is that it does not work when I try to, say, bold a section of text that comprises two different fonts. I can make it so that it will work, but it changes all selected text to the same font type. This is not what a user would want, and it is not what I want. I can also make it work on sections of text as long as the same font is being used for each character. This is very limited and strange behavior.

I want Word-like behaviour. I.e. I want to apply bold, italic, whatever, to a selection of text and retain its font, size, color, etc.

I know for a fact there is a way to do this, as I had it working a year or two ago. Unfortunately I lost the code because I forgot to back it up before a format / reinstall. /me cries. lol. It worked perfectly using a solution I found on the Net. It was only a few lines and it used arithmetic operators, is all I remember. There were a lot of replies banging on about not using arithmetic operators, etc, etc. But it worked perfectly in every case. I just can't for the life of me remember what I entered into Google to come up with it.

Anyway, like I said, I know there is a way to do this and it doesn't involve looping through characters. If anyone can tell me how to do this, I would be most grateful. I don't mind using Windows APIs, whatever it takes. This is a common requirement, and I'm surprised it's so damned difficult to figure out!

I would prefer any code examples to be in C#, as I am not as adept with VB .NET. Thanks in advance for your time.

Pratik Patani · Answer

It helped me. Thanks

veeramani narayanasamy · Answer

Try this, RichTextBox1.SelectionFont = New Font(RichTextBox1.SelectionFont, RichTextBox1.SelectionFont.Style Xor FontStyle.Bold)

Andrew Murn · Answer

Huh? That's cute. One line of code has been split into two, and moved to the bottom of the screen. Hope you can figure out what was intended.

Andrew Murn · Answer

Try this: rtb1.SelectionFont = This will toggle the BOLD attribute for the selected text as a function of the attribute of the first character of the text. If the BOLD-ness of each character differs, and you want to toggle each character individually, then write the function to step through each character one by one. Tedious, but not particularly difficult. And computers don't complain much. This is VB, but the principle should still work in C#. If it doesn't then experiment. And please don't respond with "Please read my question properly." It won't get you any favours. Andrew New Font(rtb1.SelectionFont, rtb1.SelectionFont.Style Xor FontStyle.Bold)

Venkatgiri Sridharan · Answer

Pls give me code...

James Finch · Answer

I know how to do all those things quite easily. Please read my question properly.

Kirtan Patel · Answer

hi, here is What you want . You Just Need to Change Font In Font Dialog opened When you Click Font Button in below Example . For Opening Font Dialog I have Provided the Code Below . // to Make The Selected Text Font Bold private void btnChangeToRed_Click(object sender, EventArgs e) { richTextBox1.SelectionFont = new Font(richTextBox1.SelectionFont, FontStyle.Bold); } // to Change the Color of Selected Text private void btnChangeToRed_Click(object sender, EventArgs e) { richTextBox1.SelectionColor = Color.Red; } //to change the Font of Selected Text //Make Sure you Select True Type Font only for Rich Text Box private void btnFont_Click(object sender, EventArgs e) { FontDialog fd = new FontDialog(); if (fd.ShowDialog() == DialogResult.OK) { richTextBox1.SelectionFont = new Font(fd.Font.FontFamily, fd.Font.Size); } } Happy Coding :)