Question

how can I get the lines which are have selected text in them?
For example:

The selected lines would be 1, 2,3 and 4 (0 being the first line)

How can I get to code like:

For Each line as string(or integer) in textbox1."SelectedLines"
  'Do something here for each line
Next

Thanks

Answer 1

Taking you literally, you need to find the line numbers, even though only parts of line 1 and 4 are selected. Do that as follows:

    If RichTextBox1.SelectionLength > 0 Then
        Dim firstLine As Integer = RichTextBox1.GetLineFromCharIndex(RichTextBox1.SelectionStart)
        Dim lastLine As Integer = RichTextBox1.GetLineFromCharIndex(RichTextBox1.SelectionStart + RichTextBox1.SelectionLength)
        For line As Integer = firstLine To lastLine
            Dim txt = RichTextBox1.Lines(line)
            ' do something...
        Next
    End If