private void ImageToPdf(string ImagePath, string NPath)
        {
            string fileNameExt = ImagePath.Substring(ImagePath.LastIndexOf("\\") + 1);
            string ePath       = ImagePath.Remove(ImagePath.LastIndexOf("."));
            //新建PDF文档,添加一页
            PdfDocument doc  = new PdfDocument();
            PdfPageBase page = doc.Pages.Add();

            //加载图片到Image对象
            Image image = Image.FromFile(ImagePath);

            //调整图片大小
            int    width       = image.Width;
            int    height      = image.Height;
            float  scale       = page.Size.Width / width; //缩放比例
            Size   size        = new Size((int)(width * scale), (int)(height * scale));
            Bitmap scaledImage = new Bitmap(image, size);
            ////595
            //float pages = page.Size.Width;
            ////842
            //float pagess = page.Size.Height;
            //加载缩放后的图片到PdfImage对象
            PdfImage pdfImage = PdfImage.FromImage(scaledImage);

            //设置图片位置
            float x = 0f;
            float y = 0f;

            //在指定位置绘入图片
            page.Canvas.DrawImage(pdfImage, x, y);

            //保存文档
            doc.SaveToFile(NPath + "\\" + fileNameExt + ".pdf");
        }
        private static void DrawPage(PdfPageBase page, CFDIXML cfdi)
        {
            float pageWidth      = page.Canvas.ClientSize.Width;
            float y              = 0;
            float leftMargin     = 5;
            float midPage        = pageWidth / 2;
            float topWritingArea = 0;
            int   sectionSpacing = 15;
            float qrSize         = 100;

            //Fonts
            string          fontName    = "Arial Condensed";
            PdfTrueTypeFont font7Bold   = new PdfTrueTypeFont(new Font(fontName, 7f, System.Drawing.FontStyle.Bold));
            PdfTrueTypeFont font7       = new PdfTrueTypeFont(new Font(fontName, 7f, System.Drawing.FontStyle.Regular));
            PdfTrueTypeFont font6Italic = new PdfTrueTypeFont(new Font(fontName, 6f, System.Drawing.FontStyle.Italic));

            //Colors
            PdfRGBColor lightBlack = new PdfRGBColor(17, 17, 17);

            //Pen
            PdfPen penLightGray1p   = new PdfPen(System.Drawing.Color.LightGray, 1f);
            PdfPen penLightGray05p  = new PdfPen(System.Drawing.Color.LightGray, 0.5f);
            PdfPen penLightBlack10p = new PdfPen(lightBlack, 10f);

            //Brushes
            PdfBrush brushBlack     = new PdfSolidBrush(System.Drawing.Color.Black);
            PdfBrush brushLightGray = new PdfSolidBrush(System.Drawing.Color.LightGray);

            //Format Alignments
            PdfStringFormat formatRight  = new PdfStringFormat(PdfTextAlignment.Right);
            PdfStringFormat formatMiddle = new PdfStringFormat(PdfTextAlignment.Center, PdfVerticalAlignment.Middle);
            PdfStringFormat formatLeft   = new PdfStringFormat(PdfTextAlignment.Left)
            {
                CharacterSpacing = 0.4f
            };

            //Page header
            String text = "Factura version " + cfdi.Version;

            page.Canvas.DrawString(text, font6Italic, brushLightGray, pageWidth, y, formatRight);
            SizeF size = font6Italic.MeasureString(text, formatRight);

            y = y + size.Height + 1;
            page.Canvas.DrawLine(penLightGray1p, 0, y, pageWidth, y);

            y = y + 5;
            topWritingArea = y;

            //Issuerinfo
            //Name
            DrawToPage(page, cfdi.Emisor.Nombre, font7Bold, brushBlack, formatLeft, leftMargin, y, out y);
            //RFC
            DrawToPage(page, cfdi.Emisor.Rfc, font7Bold, brushBlack, formatLeft, leftMargin, y, out y);
            //Fiscal Regime
            DrawToPage(page, cfdi.Emisor.RegimenFiscal, font7, brushBlack, formatLeft, leftMargin, y, out y);
            //Address
            text = "Calle:" + cfdi.Emisor.Domicilio.Calle + " No:" + cfdi.Emisor.Domicilio.NoExterior;
            if (cfdi.Emisor.Domicilio.NoInterior != null)
            {
                text += "-" + cfdi.Emisor.Domicilio.NoInterior;
            }
            text += " Col:" + cfdi.Emisor.Domicilio.Colonia + ", Localidad:" + cfdi.Emisor.Domicilio.Localidad + ", Municipio:" + cfdi.Emisor.Domicilio.Municipio + ", Estado:" + cfdi.Emisor.Domicilio.Estado + ", CP:" + cfdi.Emisor.Domicilio.Cp;
            RectangleF area = new RectangleF(leftMargin, y, midPage - 10, 30);

            DrawToPage(page, text, font7, brushBlack, formatLeft, area, y, out y, false);
            DrawToPage(page, "Pais:" + cfdi.Emisor.Domicilio.Pais, font7, brushBlack, formatLeft, leftMargin, y, out y);

            //Invoice data
            y = topWritingArea;
            //Invoice header
            y += 5;
            page.Canvas.DrawLine(penLightBlack10p, midPage, y, pageWidth, y);
            text = "Factura";
            size = font7Bold.MeasureString(text, formatLeft);
            y   -= 4;
            DrawToPage(page, text, font7Bold, brushLightGray, formatLeft, pageWidth - size.Width - 10, y, out y);
            //Invoice number
            DrawToPageWithHeader(page, "Folio:", cfdi.Folio, font7Bold, font7, brushBlack, formatLeft, midPage, y, out y);
            DrawToPageWithHeader(page, "Serie:", cfdi.Serie ?? "", font7Bold, font7, brushBlack, formatLeft, midPage, y, out y);
            DrawToPageWithHeader(page, "Folio Fiscal:", cfdi.TimbreFiscal.UUID, font7Bold, font7, brushBlack, formatLeft, midPage, y, out y);
            DrawToPageWithHeader(page, "Serie CSD del SAT:", cfdi.TimbreFiscal.NoCertificadoSAT, font7Bold, font7, brushBlack, formatLeft, midPage, y, out y);
            DrawToPageWithHeader(page, "No. Certificado:", cfdi.NoCertificado, font7Bold, font7, brushBlack, formatLeft, midPage, y, out y);
            DrawToPageWithHeader(page, "Fecha emsión:", cfdi.Fecha, font7Bold, font7, brushBlack, formatLeft, midPage, y, out y);
            DrawToPageWithHeader(page, "Fecha certificación:", cfdi.TimbreFiscal.FechaTimbrado, font7Bold, font7, brushBlack, formatLeft, midPage, y, out y);

            //Issue place
            y += 5;
            DrawToPageWithHeader(page, "Lugar de expedición:", cfdi.LugarExpedicion, font7Bold, font7, brushBlack, formatLeft, leftMargin, y, out y);

            //Reciever data
            //Reciever header
            y += sectionSpacing;
            page.Canvas.DrawLine(penLightBlack10p, leftMargin, y, pageWidth, y);
            text = "Receptor";
            size = font7Bold.MeasureString(text, formatLeft);
            y   -= 4;
            DrawToPage(page, text, font7Bold, brushLightGray, formatLeft, midPage - (size.Width / 2), y, out y);
            //Reciever name
            DrawToPageWithHeader(page, "Receptor:  ", cfdi.Receptor.Nombre, font7Bold, font7, brushBlack, formatLeft, leftMargin, y, out y, true);
            //Reciever address
            text = "Calle:  " + cfdi.Receptor.Domicilio.Calle + " No:" + cfdi.Receptor.Domicilio.NoExterior;
            if (cfdi.Receptor.Domicilio.NoInterior != null)
            {
                text += "-" + cfdi.Receptor.Domicilio.NoInterior;
            }
            DrawToPageWithHeader(page, "Domicilio:   ", text, font7Bold, font7, brushBlack, formatLeft, midPage, y, out y);
            //RFC
            DrawToPageWithHeader(page, "R.F.C.:", cfdi.Receptor.Rfc, font7Bold, font7, brushBlack, formatLeft, leftMargin, y, out y, true);
            //Next line address
            text = " Col:" + cfdi.Receptor.Domicilio.Colonia + ", Localidad:" + cfdi.Receptor.Domicilio.Localidad + ", Municipio:" + cfdi.Receptor.Domicilio.Municipio;
            area = new RectangleF(midPage, y, midPage - 10, 20);
            DrawToPage(page, text, font7, brushBlack, formatLeft, area, y, out y, false);
            text = " Estado:" + cfdi.Receptor.Domicilio.Estado + ", CP:" + cfdi.Receptor.Domicilio.Cp;
            DrawToPage(page, text, font7, brushBlack, formatLeft, midPage, y, out y);
            DrawToPage(page, "Pais:" + cfdi.Receptor.Domicilio.Pais, font7, brushBlack, formatLeft, midPage, y, out y);

            //Products
            y += sectionSpacing;

            //Prepare data
            String[][] dataSource = new String[cfdi.Conceptos.Count + 1][];
            String     headers    = "Cant.;Unidad;Clave;Descripción;Valor unitario;Importe";
            int        i          = 0;

            dataSource[i] = headers.Split(';');
            foreach (Concepto product in cfdi.Conceptos)
            {
                i++;
                String[] content = new String[6];
                content[0]    = product.Cantidad.ToString();
                content[1]    = product.Unidad;
                content[2]    = product.NoIdentificacion;
                content[3]    = product.Descripcion;
                content[4]    = String.Format("{0:N1}", product.ValorUnitario);
                content[5]    = String.Format("{0:C2}", product.Importe);
                dataSource[i] = content;
            }

            //Generate table
            PdfTable      productsTable = new PdfTable();
            PdfTableStyle style         = new PdfTableStyle()
            {
                BorderPen      = new PdfPen(lightBlack, 0.5f),
                CellPadding    = 2,
                HeaderSource   = PdfHeaderSource.Rows,
                HeaderRowCount = 1,
                ShowHeader     = true,
                HeaderStyle    = new PdfCellStyle()
                {
                    BackgroundBrush = new PdfSolidBrush(System.Drawing.Color.Black),
                    TextBrush       = brushLightGray,
                    StringFormat    = formatMiddle
                }
            };

            productsTable.Style = style;

            productsTable.DataSource       = dataSource;
            productsTable.Columns[0].Width = 8;
            productsTable.Columns[3].Width = 30;
            foreach (PdfColumn column in productsTable.Columns)
            {
                column.StringFormat = formatLeft;
            }

            PdfLayoutResult result = productsTable.Draw(page, new PointF(leftMargin, y));

            y = y + result.Bounds.Height + 5;

            //Total in letter and number
            page.Canvas.DrawLine(penLightBlack10p, leftMargin, y, pageWidth, y);
            text = "Total con Letra";
            size = font7Bold.MeasureString(text, formatLeft);
            y   -= 4;
            DrawToPage(page, text, font7Bold, brushLightGray, formatLeft, leftMargin, y, out y);
            DrawToPage(page, Conv.Enletras(cfdi.Total.ToString()) + "M.N.", font7, brushBlack, formatLeft, leftMargin, y, out y, true);

            DrawToPageWithHeader(page, "Subtotal:", String.Format("       {0:C2}", cfdi.SubTotal), font7Bold, font7, brushBlack, formatLeft, midPage + (midPage / 2), y, out y);
            DrawToPageWithHeader(page, "Total:", String.Format("            {0:C2}", cfdi.Total), font7Bold, font7, brushBlack, formatLeft, midPage + (midPage / 2), y, out y);

            //QR Code with basic data
            QRCodeGenerator qrGenerator = new QRCodeGenerator();
            QRCodeData      qrCodeData  = qrGenerator.CreateQrCode(String.Format("?re={0}&rr={1}&tt={2:N1}&id={3}", cfdi.Emisor.Rfc, cfdi.Receptor.Rfc, cfdi.Total, cfdi.TimbreFiscal.UUID), QRCodeGenerator.ECCLevel.Q);
            QRCode          qrCode      = new QRCode(qrCodeData);
            Bitmap          qrCodeImage = qrCode.GetGraphic(20);

            float qrPosition = y;

            PdfImage image = PdfImage.FromImage(qrCodeImage);

            page.Canvas.DrawImage(image, leftMargin, y, qrSize, qrSize);

            //Payment info
            y = qrPosition + sectionSpacing;
            DrawToPageWithHeader(page, "Método de pago:  ", cfdi.MetodoDePago, font7Bold, font7, brushBlack, formatLeft, leftMargin + qrSize, y, out y);
            DrawToPageWithHeader(page, "Cuenta:  ", cfdi.NumCtaPago ?? "", font7Bold, font7, brushBlack, formatLeft, leftMargin + qrSize, y, out y);
            DrawToPageWithHeader(page, "Forma de pago:  ", cfdi.FormaDePago, font7Bold, font7, brushBlack, formatLeft, leftMargin + qrSize, y, out y);
            DrawToPageWithHeader(page, "Condiciones de pago:  ", cfdi.CondicionesDePago ?? "", font7Bold, font7, brushBlack, formatLeft, leftMargin + qrSize, y, out y);

            y = qrPosition + qrSize + sectionSpacing;
            page.Canvas.DrawLine(penLightBlack10p, leftMargin, y, pageWidth, y);
            text = "Cadena original del complemento de certificación del SAT";
            size = font7Bold.MeasureString(text, formatLeft);
            y   -= 4;
            DrawToPage(page, text, font7Bold, brushLightGray, formatLeft, leftMargin, y, out y);
            area = new RectangleF(leftMargin, y, pageWidth - 5, 100);
            DrawToPage(page, String.Format("||{0}|{1}|{2}|{3}|{4}", cfdi.TimbreFiscal.Version, cfdi.TimbreFiscal.UUID, cfdi.TimbreFiscal.FechaTimbrado, cfdi.Sello, cfdi.TimbreFiscal.NoCertificadoSAT), font7Bold, brushBlack, formatLeft, area, y, out y, false);

            y += sectionSpacing;
            page.Canvas.DrawLine(penLightBlack10p, leftMargin, y, pageWidth, y);
            text = "Sello digital del SAT";
            size = font7Bold.MeasureString(text, formatLeft);
            y   -= 4;
            DrawToPage(page, text, font7Bold, brushLightGray, formatLeft, leftMargin, y, out y);
            area = new RectangleF(leftMargin, y, pageWidth - 5, 100);
            DrawToPage(page, cfdi.TimbreFiscal.SelloSAT, font7Bold, brushBlack, formatLeft, area, y, out y, false);

            y += sectionSpacing;
            page.Canvas.DrawLine(penLightBlack10p, leftMargin, y, pageWidth, y);
            text = "Sello digital del contribuyente que lo expide";
            size = font7Bold.MeasureString(text, formatLeft);
            y   -= 4;
            DrawToPage(page, text, font7Bold, brushLightGray, formatLeft, leftMargin, y, out y);
            area = new RectangleF(leftMargin, y, pageWidth - 5, 100);
            DrawToPage(page, cfdi.Sello, font7Bold, brushBlack, formatLeft, area, y, out y, false);

            //Footer
            DrawToPage(page, "Este documento es una representación impresa de un CFDI", font7, brushBlack, formatLeft, midPage, page.Canvas.ClientSize.Height - 30, out y, false);
        }