在Itextsharp中找不到MultiColumnText错误

Question

我正在尝试使用C＃和iTextSharp将pdf页面分成两部分。

执行此操作后，我想首先将值添加到第一部分，然后添加到第二部分。

我用Google搜索并了解MultiColumnText但是在使用它时却给出了错误。我使用的是版本5.5.0。

以下是代码：

MultiColumnText columns = new MultiColumnText();

//float left, float right, float gutterwidth, int numcolumns
columns.AddRegularColumns(36f, doc.PageSize.Width - 36f, 24f, 2);

Paragraph para = new Paragraph(text, new Font(Font.NORMAL, 8f));
para.SpacingAfter = 9f;
para.Alignment = Element.ALIGN_JUSTIFIED;

for (int i = 0; i < 8; i++)
{
    columns.AddElement(para);
}

doc.Add(columns);

我在第一行遇到错误：MultiColumnText columns = new MultiColumnText();

如何在此dll中使用此代码？请帮帮我！

更新了代码..

        public static void paraPDF(){

        //string pdfpath = "D:\\hello\\12.pdf";
        string imagepath = "D:\\Bill\\Hello.pdf";
        Document doc = new Document();


        try
          {
               string TEXT = "This is some long paragraph that will be added over and over again to prove a point.";
               Rectangle[] COLUMNS = {
                new Rectangle(36, 36, 290, 806),
                new Rectangle(305, 36, 559, 806)
              };


        PdfWriter writer2= PdfWriter.GetInstance(doc, new FileStream(imagepath, FileMode.Create));
        doc.Open();
        PdfContentByte canvas = writer2.DirectContent;
        ColumnText ct = new ColumnText(canvas);
        int side_of_the_page = 0;
        ct.SetSimpleColumn(COLUMNS[side_of_the_page]);
         int paragraphs = 0;
              while (paragraphs < 30)
          {
           ct.AddElement(new Paragraph(String.Format("Paragraph %s: %s", ++paragraphs, TEXT)));
               while (ColumnText.HasMoreText(ct.Go()))
            {
        if (side_of_the_page == 0)
        {
            side_of_the_page = 1;
            canvas.MoveTo(297.5f, 36);
            canvas.LineTo(297.5f, 806);
            canvas.Stroke();
        }
        else
        {
            side_of_the_page = 0;
            doc.NewPage();
        }
        ct.SetSimpleColumn(COLUMNS[side_of_the_page]);
        doc.Close();
    }
}