Change RichTextBox highlight BackColor and ForeColor

Question

I'm making a syntax analizer, so what I do is to change the colors and fonts of some words in a RichTextBox, but sometimes, when the text is too long, my richtextbox shows some highlighting. I want to change these to the same BackColor and ForeColor as the current word properties, so user can't notice this highlighting. How can I change the RichTextBox highlighted word Back and Fore colors ?

See [How to append text to RichTextBox without scrolling and losing selection?](http://stackoverflow.com/a/6550415/719186) — LarsTech, Sep 04 '15 at 23:48
@LarsTech Thanks! That's what I was asking for :)) Working fine :P — RAS, Sep 05 '15 at 00:02

score 1 · Answer 1 · answered Sep 04 '15 at 23:46

1

If you want to change color and back color of selected text, try this (If I understood your question correctly)

this.richTextBox1.SelectionColor = Color.Red;
this.richTextBox1.SelectionBackColor = Color.Blue;

answered Sep 04 '15 at 23:46

Reza Aghaei

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score 1 · Answer 2 · answered Sep 05 '15 at 08:41

If you want to set all of the text in the richtextbox then type

this.richtextbox.SelectAll();

And then follow up with

this.richTextBox1.SelectionColor = Color.Red;
this.richTextBox1.SelectionBackColor = Color.Blue;

As Reza Aghaei said.

If you want it do this automatically then double click the richtextbox to create the text changed event and put the code inside this.

 private void richTextBox1_TextChanged(object sender, EventArgs e)
 {
      //Remember the cursor position & length
      int SelectionStart = richTextBox1.SelectionStart;
      int SelectionLength = richTextBox1.SelectionLength;

      //Select all text and change color
      richtextbox1.SelectAll();
      richTextBox1.SelectionColor = Color.Red;
      richTextBox1.SelectionBackColor = Color.Blue;

      //Select original text
      richTextBox1.Select(SelectionStart, SelectionLength);
 }

Change RichTextBox highlight BackColor and ForeColor

2 Answers2