Convert index in line to index in richtextbox?

Question

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I can get content of a line using selectstart, when I want to know position of selected string. How to know string's position in richtextbox after I get its position in line?

Get content of line:

C#

string[] RichTextBoxLines = rtb.Lines;
foreach (string sline in RichTextBoxLines)
{
  label1.Text= sline;
  label2.Text=label1.Text.IndexOf("mk").ToString();
  int t = label1.Text.IndexOf("mk");
  //rtb.Select(string's postion in richtextbox, "mk".Length);
  //Substring or  do something

}

thanks

Posted 29-Jul-12 20:25pm

giatuan2011

Updated 31-Jul-12 4:26am

Malli_S

v2

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Comments

Sergey Alexandrovich Kryukov 30-Jul-12 2:49am

You need to tell us exact type of RichTextBox, as the solutions for different types are very different.
--SA

Kenneth Haugland 31-Jul-12 11:13am

I would guess this would involve the caret position anyway, so you'll have to do a search since you dont give us any information.

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obp42 · Answer 1 · 2012-07-31T05:20:00

You could try this:

C#

int charIndex = 0;

foreach (string sline in rtb.Lines)
{
  label1.Text= sline;
  label2.Text = label1.Text.IndexOf("mk").ToString();

  charIndex += sline.IndexOf("mk");

  rtb.Select(charIndex, "mk".Length);

  charIndex += sline.Length - sline.IndexOf("mk") + 1;
}