How to get line number

[Tommaso]

I'm using the following snippet to find text

private void HightlightText(string textToHighlight)
{
    DocumentTextSearch search = new DocumentTextSearch(this.radRichTextBox1.Document);
    foreach (var textRange in search.FindAll(textToHighlight))
    {
        this.radRichTextBox1.Document.Selection.AddSelectionStart(textRange.StartPosition);
        this.radRichTextBox1.Document.Selection.AddSelectionEnd(textRange.EndPosition);
        this.radRichTextBox1.ChangeTextHighlightColor(Color.Red);
    }
}

I'd like to know how to get the line number of the textRange found and the entire text of the line that contains textRange.

Tommaso

[Svett]

Hi Tommaso,

It is not possible to determine the line number in the whole document. You can get the line number in the context of paragraph only. This restriction is caused because RadRichTextBox supports complex and nested layouts which cannot produce the line number as well as a pure text editor. You can get the line index inside the paragraph by using the following code snippet:

textRange.StartPosition.GetCurrentInlineBox().LineInfo.Paragraph

I hope this helps.
 
Regards,
Svett
the Telerik team

[Tommaso]

What property or method of

 

textRange.StartPosition.GetCurrentInlineBox().LineInfo.Paragraph

I must use to get line index?

[Svett]

Hi Tommaso,

I posted the wrong code snippet. Please excuse me for the misunderstanding.

You can get the index in paragraph by using the following line:

textRange.StartPosition.GetCurrentInlineBox().LineInfo.IndexInParagraph

 Kind regards,
Svett
the Telerik team

[Tommaso]

Unfortunately the value I got is always 0.

The document I attach to the RichTextBox is a plain text document.

[Svett]

Hi Tommaso,

The IndexInParagraph property can return zero, if the paragraph contains only one line. You can calculate the line number of the word by using the following code snippet:

InlineLayoutBox box = textRange.StartPosition.GetCurrentInlineBox();
int index = box.LineInfo.IndexInParagraph;
int lineNumber = box.LineInfo.Paragraph.ChildIndex + index;

Note that the code above will work, if the document contains only paragraphs and text (excluding tables and images).
 
Regards,
Svett
the Telerik team

[Tommaso]

The snippet works if I add 1 to the lineNumber value.

Thanks for your support.