Highlight basing on indexes

[Naga]

We have huge text being displayed inside a rich text box. We have implemented our custom Regular expression for advanced searches like Date > 1/1/200 which will look inside the text and will return say index of word for ex 1/12/2011, we represent it as word range which is essentially starting index and end index of the hit. Now I want to mix the above logic with highlighting infrastructure of the rich text box.


I m using the below code

ITextBasedDocumentFormatProvider

 

 

exporter = new TxtFormatProvider();

 

var documentTextMap = new DocumentTextMap(radRichTextBox.Document);

 

string text = exporter.Export((documentTextMap).Document);

 

WordHitEvaluator.WordRange[] wordRanges = wordHitEvaluator.Evaluate(text, fieldNames);

if (wordRanges != null)

 

foreach (WordHitEvaluator.WordRange wordRange in wordRanges)

{

 

TextRange textRange = documentTextMap.MapFromIndexInText(wordRange.Start,

wordRange.End - wordRange.Start);

radRichTextBox.Document.Selection.SetSelectionStart(textRange.StartPosition);

radRichTextBox.Document.Selection.AddSelectionEnd(textRange.EndPosition);

}

radRichTextBox.ChangeTextHighlightColor(

 

Colors.Red);

radRichTextBox.Document.Selection.Clear();

But for some reason it fails.Can you please let me know if this hybrid highlight is possible?

Thanks,
Naga.

[Boby]

Hello Naga,
SetSelectionStart will clear the current selection, you can use AddSelectionStart method instead.

Don't hesitate to contact us if you have other questions.

All the best,
Boby
the Telerik team