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How to get displayed text in RichTextBox?
I mean if RichTextBox is scrolled to the end, I’d like to receive only those lines, which are visible for me.
P.S.It’ll be enough to get fisrt displayed string
You want to use RichTextBox.GetCharIndexFromPosition(). To get the index of the first visible character, pass new Point(0, 0), the upper left corner of the RTB client area. To get the index of the last visible character, pass new Point(rtb.ClientSize.Width, rtb.ClientSize.Height). RichTextBox.Text.Substring() then gets you all visible text.
If necessary, you can use RichTextBox.GetLineFromCharIndex() to translate the character indexes to line numbers.