带格式分离两个RichEditControl的文本

using( RichEditControl selector = new RichEditControl() {

RtfText = richTextFromHtml 

} ) {

DocumentRange rangeBlockOne = selector.Document.CreateRange( 0, 19 );

DocumentRange rangeBlockTwo = selector.Document.CreateRange( 19, 49 );

richTextBlockOne = selector.Document.GetRtfText( rangeBlockOne );

richTextBlockTwo = selector.Document.GetRtfText( rangeBlockTwo );

}