Class DocumentVisitor

public abstract class DocumentVisitor
   {
      public abstract void Visit(Document document);
      public void Visit(Table table)
      {
      }
      public void Visit(Cell cell)
      {
      }
      public void Visit(Row row)
      {
      }
      public void Visit(Section section)
      {
      }
      public void Visit(Paragraph paragraph)
      {
      }
      public void Visit(Run run)
      {
      }
   }

public static void Run()
{
    string dataDir = RunExamples.GetDataDir_LoadingAndSaving();
    Document doc = new Document(dataDir + "Aspose.one");
    MyOneNoteToTxtWriter myConverter = new MyOneNoteToTxtWriter();
    doc.Accept(myConverter);
    Console.WriteLine(myConverter.GetText());
    Console.WriteLine(myConverter.NodeCount);
}
public class MyOneNoteToTxtWriter : DocumentVisitor
{
    public MyOneNoteToTxtWriter()
    {
        nodecount = 0;
        mIsSkipText = false;
        mBuilder = new StringBuilder();
    }
    public string GetText()
    {
        return mBuilder.ToString();
    }
    private void AppendText(string text)
    {
        if (!mIsSkipText)
        {
            mBuilder.AppendLine(text);
        }
    }
    public override void VisitRichTextStart(RichText run)
    {
        ++nodecount;
        AppendText(run.Text);
    }
    public override void VisitDocumentStart(Document document)
    {
        ++nodecount;
    }
    public override void VisitPageStart(Page page)
    {
        ++nodecount;
        AppendText($"*** Page '{page.Title?.TitleText?.Text ?? "(no title)"}' ***");
    }
    public override void VisitPageEnd(Page page)
    {
        AppendText(string.Empty);
    }
    public override void VisitTitleStart(Title title)
    {
        ++nodecount;
    }
    public override void VisitImageStart(Image image)
    {
        ++nodecount;
    }
    public override void VisitOutlineGroupStart(OutlineGroup outlineGroup)
    {
        ++nodecount;
    }
    public override void VisitOutlineStart(Outline outline)
    {
        ++nodecount;
    }
    public override void VisitOutlineElementStart(OutlineElement outlineElement)
    {
        ++nodecount;
    }
    public Int32 NodeCount
    {
        get { return this.nodecount; }
    }
    private readonly StringBuilder mBuilder;
    private bool mIsSkipText;
    private int nodecount;
}

protected DocumentVisitor()
   {
   }

public virtual void VisitAttachedFileEnd(Aspose.Words.AttachedFile attachedFile)
   {
   }

public virtual void VisitAttachedFileStart(Aspose.Words.AttachedFile attachedFile)
   {
   }

public virtual void VisitDocumentEnd(Aspose.Words.Document document)
   {
   }

public override void VisitDocumentStart(Document document)
   {
   }

public virtual void VisitImageEnd(Aspose.Words.Image image)
   {
   }

public virtual void VisitImageStart(Aspose.Words.CheckBox image)
   {
   }

public virtual void VisitInkDrawingEnd(InkDrawing inkDrawing)
   {
   }

public virtual void VisitInkDrawingStart(Aspose.Words.CheckBox inkDrawing)
   {
   }

public virtual void VisitInkParagraphEnd(InkParagraph inkParagraph)
   {
   }

public virtual void VisitInkParagraphStart(InkParagraph inkParagraph)
   {
   }

public virtual void VisitInkWordEnd(InkWord inkWord)
   {
   }

public virtual void VisitInkWordStart(InkWord inkWord)
   {
   }

public virtual void VisitLoopEnd(Loop loop)
   {
   }

public virtual void VisitLoopStart(Loop loop)
   {
   }

public virtual void VisitOutlineElementEnd(OutlineElement outlineElement)
   {
   }

public virtual void VisitOutlineElementStart(Aspose.Words.OutlineElement outlineElement)
   {
   }

public virtual void VisitOutlineEnd(Aspose.Words.Outline outline)
   {
   }

public virtual void VisitOutlineGroupEnd(Aspose.Words.OutlineGroup outlineGroup)
   {
   }

public virtual void VisitOutlineGroupStart(Aspose.Words.OutlineGroup outlineGroup)
   {
   }

public virtual void VisitOutlineStart(Aspose.Words.CheckBox outline)
   {
   }

public override void VisitPageEnd(Aspose.Words.DocumentObject o, Aspose.Words.Page page)
   {
   }

public virtual void VisitPageStart(Page page)
   {
   }

public virtual void VisitRichTextEnd(Aspose.Words.RichText richText)
   {
   }

public virtual void VisitRichTextStart(Aspose.Words.RichText richText)
   {
   }

public virtual void VisitTableCellEnd(TableCell tableCell)
   {
   }

public virtual void VisitTableCellStart(TableCell tableCell)
   {
   }

public virtual void VisitTableEnd(Table table)
   {
   }

public virtual void VisitTableRowEnd(TableRow tableRow)
   {
   }

public virtual void VisitTableRowStart(TableRow tableRow)
   {
   }

public virtual void VisitTableStart(Table table)
   {
   }

public virtual void VisitTitleEnd(Aspose.Words.Title title)
   {
   }

public virtual void VisitTitleStart(Title title)
   {
   }