WPF RichTextBox appending coloured text

Question

I\'m using the RichTextBox.AppendText function to add a string to my RichTextBox. I\'d like to set this with a particular colour. How can I do this?

Answer 1

Be Aware of TextRange's Overhead

I spent a lot of time tearing my hair out, because TextRange wasn't fast enough for my use-case. This method avoids the overhead. I ran some barebones tests, and its faster by a factor of ~10 (but don't take my word for it lol, run your own tests)

Paragraph paragraph = new Paragraph();
Run run = new Run("MyText");
paragraph.Inlines.Add(run);
myRichTextBox.Document.Blocks.Add(paragraph);

Credit

Note: I think most use cases should work fine with TextRange. My use-case involved hundreds of individual appends, and that overhead stacks up.