I have a RichTextBox that I write a string to every time I click a Form button. Each string begins with the string "Long" or "Short" and ends with a newline. Each time I add a string, it appends to the bottom of the RichTextBox. I'd like to color each line red if it beings with "Long" and blue if it begins with "Short". How can I do this?
Richtextbox font colorForeColor = Color. FromArgb(255, 108, 105, 105);
SelectionFont = new Font(textBox. Font, FontStyle. Bold);
The RichTextBox control enables you to display or edit flow content including paragraphs, images, tables, and more. This topic introduces the TextBox class and provides examples of how to use it in both Extensible Application Markup Language (XAML) and C#.
The RichTextBox is similar to the TextBox, but it has additional formatting capabilities. Whereas the TextBox control allows the Font property to be set for the entire control, the RichTextBox allows you to set the Font, as well as other formatting properties, for selections within the text displayed in the control.
Sure, so what you can do is use the SelectionStart, SelectionLength and SelectionColor properties to accomplish this. It works quite well.
Check out this page for info on these properties.
You can know the length of the RichTextBox text and color this as you go by setting the SelectionStart property to the current length, get the Length of the string you are going to append, set the SelectionLength and then set the SelectionColor as appropriate. Rinse and repeat for each string added.
int length = richTextBox.TextLength; // at end of text richTextBox.AppendText(mystring); richTextBox.SelectionStart = length; richTextBox.SelectionLength = mystring.Length; richTextBox.SelectionColor = Color.Red;
Something like that. That's how I remember it working.
I was just doing this in a program I was writing. I was doing something like @itsmatt but I feel a bit simpler. You are able to just set the Selectioncolor
and from that point on the RichTextBox
will be that color until you change it to something else. If you are testing every line this seems to work out well and is easy.
if(myString == "Long") { richTextBox.SelectionColor = Color.Red; } else { richTextBox.SelectionColor = Color.Green } richTextBox.AppendText(myString);
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