public ITextPatternRange FindText(string txt, bool backward, bool ignoreCase)
{
string contents = text.GetText();
StringComparison cmp = ignoreCase ? StringComparison.CurrentCultureIgnoreCase
: StringComparison.CurrentCulture;
if (String.IsNullOrEmpty(txt) || String.IsNullOrEmpty(contents))
{
return(null);
}
int index = -1;
if (backward)
{
index = contents.LastIndexOf(txt, endOffset - 1,
endOffset - startOffset, cmp);
}
else
{
index = contents.IndexOf(txt, startOffset,
endOffset - startOffset, cmp);
}
return((index >= 0) ? new TextRangePattern(accessible,
index, index + txt.Length)
: null);
}