/// <summary>
    /// 生成Pdf
    /// </summary>
    /// <param name="filePath"></param>
    /// <param name="bo"></param>
    /// <returns></returns>
    public bool GeneratePdf(string filePath, PdfBo bo) {
      int margin_left_right = 30;//左右邊距
      int margin_top_bottom = 30;//上下邊距
      //1. 定義文檔對象
      PdfDocument document = new PdfDocument();
      //2. 新增一頁
      PdfPage page = document.AddPage();
      // 設置紙張大小
      page.Size = PageSize.A4;
      //3. 創(chuàng)建一個繪圖對象
      XGraphics gfx = XGraphics.FromPdfPage(page);
      XFont font = new XFont("華文宋體", 40, XFontStyle.Bold);
      //定制化內容開始
      int cur_x = 0 + margin_left_right;
      int cur_y = 0 + margin_top_bottom;
      //標題1
      gfx.DrawString(bo.Head1, font, XBrushes.Red, new XRect(cur_x, cur_y, page.Width-2*cur_x, 80), XStringFormats.Center);
      //序號
      font = new XFont("華文宋體", 12, XFontStyle.Regular);
      cur_y = cur_y + 80;
      gfx.DrawString(bo.No, font, XBrushes.Black, new XRect(cur_x, cur_y, 100, 20), XStringFormats.CenterLeft);
      //密級
      cur_x = cur_x + 200;
      gfx.DrawString(string.Format("密級[{0}]",bo.Private), font, XBrushes.Black, new XRect(cur_x, cur_y, 100, 20), XStringFormats.CenterLeft);
      //緩級
      cur_x = cur_x + 100;
      gfx.DrawString(string.Format("緩級[{0}]", bo.Speed), font, XBrushes.Black, new XRect(cur_x, cur_y, 100, 20), XStringFormats.CenterLeft);
      //簽發(fā)人
      cur_x = cur_x + 100;
      gfx.DrawString(string.Format("簽發(fā)人：{0}", bo.Person), font, XBrushes.Black, new XRect(cur_x, cur_y, 100, 20), XStringFormats.CenterLeft);
      //一條橫線
      cur_x = 0 + margin_left_right;
      cur_y = cur_y + 20;
      XPen pen = new XPen(XColor.FromKnownColor(XKnownColor.Black), 1);
      gfx.DrawLine(pen, cur_x, cur_y, page.Width-cur_x, cur_y+2);
      //標題2
      font = new XFont("華文宋體", 20, XFontStyle.Regular);
      cur_y = cur_y + 10;
      gfx.DrawString(bo.Head2, font, XBrushes.Black, new XRect(cur_x, cur_y, page.Width-2*cur_x, 40), XStringFormats.Center);
      //抬頭
      font = new XFont("華文宋體", 15, XFontStyle.Bold);
      cur_y = cur_y + 40;
      gfx.DrawString(bo.Title, font, XBrushes.Black, new XRect(cur_x, cur_y, page.Width, 40), XStringFormats.CenterLeft);
      //正文 ，自動換行
      cur_y = cur_y + 40;
      XTextFormatter tf = new XTextFormatter(gfx);
      font = new XFont("華文宋體", 12, XFontStyle.Regular);

      //測量當前內容下，一行可以多少個漢字
      int cnt = 0;
      int height = 0;
      for (int i = 0; i < bo.Content.Length; i++) {
        XSize xsize=gfx.MeasureString(bo.Content.Substring(0,i+1), font, XStringFormats.TopLeft);
        double width = xsize.Width;
        if (width >= page.Width - 2 * cur_x) {
          cnt = i; //表示一行可以放多少個漢字。
          height =(int) xsize.Height;
          break;
        }
      }
      cnt = cnt > 0 ? cnt : bo.Content.Length;//每一行多少漢字
      string[] arrContent = bo.Content.Split('\n');
      string new_content = "";
      int total_lines = 0;
      foreach (string content in arrContent) {
        if (content.Length <= cnt)
        {
          new_content+=string.Format("{0}\n",content);
          total_lines++;
        }
        else {
          string tmpContent = content;
          int lines = content.Length / cnt + 1;
          for (int j = 0; j < lines; j++) {
            tmpContent = tmpContent.Insert(j * cnt, "\n");
            total_lines++;
          }
          new_content += string.Format("{0}\n", tmpContent);
        }
      }
      int num = new_content.Length - new_content.Replace("\r", "").Length;
      //計算矩形
      XRect rect = new XRect(cur_x, cur_y, page.Width - 2 * cur_x, (total_lines+num)*(height+2));
      tf.DrawString(new_content, font, XBrushes.Black, rect, XStringFormats.TopLeft);
      //主題詞
      cur_y = cur_y + (total_lines + num) * (height + 2) + 20;
      font = new XFont("華文宋體", 12, XFontStyle.Bold);
      gfx.DrawString(string.Format("主題詞：{0}",bo.Keyword), font, XBrushes.Black, new XRect(cur_x, cur_y, page.Width, 40), XStringFormats.CenterLeft);
      //再加一條橫線
      cur_y = cur_y + 40;
      gfx.DrawLine(pen, cur_x, cur_y, page.Width - cur_x, cur_y + 2);
      cur_y = cur_y + 2;
      font = new XFont("華文宋體", 10, XFontStyle.Regular);
      gfx.DrawString(string.Format("{0}{1}",bo.Company, bo.Dept), font, XBrushes.Black, new XRect(cur_x, cur_y, page.Width-2*cur_x, 40), XStringFormats.CenterLeft);
      gfx.DrawString(DateTime.Now.ToString("yyyy 年 MM 月 dd 日 印發(fā)"), font, XBrushes.Black, new XRect(cur_x, cur_y, page.Width-2*cur_x, 40), XStringFormats.CenterRight);
      //水印開始
      font = new XFont("華文宋體", 20, XFontStyle.BoldItalic);
      // 計算長度
      var size = gfx.MeasureString(bo.Watermark, font);

      // 定義旋轉中心
      gfx.TranslateTransform(page.Width / 2, page.Height / 2);
      gfx.RotateTransform(-Math.Atan(page.Height / page.Width) * 180 / Math.PI);
      gfx.TranslateTransform(-page.Width / 2, -page.Height / 2);

      // 字符樣式
      var format = new XStringFormat();
      format.Alignment = XStringAlignment.Near;
      format.LineAlignment = XLineAlignment.Near;

      //畫刷
      XBrush brush = new XSolidBrush(XColor.FromArgb(128, 255, 0, 0));
      for (int i = 0; i < 3; i++) {
        gfx.DrawString(bo.Watermark, font, brush,
        new XPoint((page.Width - size.Width) / (1.5+i*0.5), (page.Height - size.Height) / (1.5 + i * 0.5)),
        format);
      }
      //水印結束
      //6. 保存文檔
      document.Save(filePath);
      return true;
    }