使用itextsharp将多个图像转换为多页PDF

Question

我需要使用模板将图像转换为PDF。我可以使用itextsharp创建一页PDF。假设1页PDF有1张图片。当我有多个图像时，问题就出现了。如何使用预定义模板创建多页PDF。以下是我的代码：

public static string CreatePDFDocument(string docname, string imagePath, string mediaField)
    {
        PdfReader pdfReader = null;
        string pdfPortrait = ConfigurationManager.AppSettings["PdfPortraitTemplate"];
        string pdfLandscape = ConfigurationManager.AppSettings["PdfLandscapeTemplate"];
        iTextSharp.text.Image instanceImg = iTextSharp.text.Image.GetInstance(imagePath);
        string filename = ConfigurationManager.AppSettings["LocalFolder"] + docname + ".pdf";
        FileStream pdfOutputFile = new FileStream(filename, FileMode.Create);
        if (instanceImg.ScaledHeight >= instanceImg.ScaledWidth)
        {
            pdfReader = new PdfReader(pdfPortrait);
        }
        else
        {
            pdfReader = new PdfReader(pdfLandscape);
        }
        PdfStamper pdfStamper = null;
        pdfStamper = new PdfStamper(pdfReader, pdfOutputFile);
        AcroFields testForm = pdfStamper.AcroFields;
        testForm.SetField("MediaField", mediaField);
        PdfContentByte overContent = pdfStamper.GetOverContent(1);
        IList<AcroFields.FieldPosition> fieldPositions = testForm.GetFieldPositions("ImageField");
        if (fieldPositions == null || fieldPositions.Count <= 0) throw new ApplicationException("Error locating field");
        AcroFields.FieldPosition fieldPosition = fieldPositions[0];
        iTextSharp.text.Rectangle imageRect = new Rectangle(fieldPosition.position.Top, fieldPosition.position.Left, fieldPosition.position.Bottom, fieldPosition.position.Right);
        instanceImg.ScaleToFit(imageRect.Height, -1 * imageRect.Width);
        instanceImg.SetAbsolutePosition(fieldPosition.position.Left, (fieldPosition.position.Top - (instanceImg.ScaledHeight)));
        overContent.AddImage(instanceImg);
        pdfStamper.FormFlattening = true;
        pdfStamper.Close();
        pdfReader.Close();
        return filename;
    }

提前感谢！

Answer 1

最后我找到了解决方案，

这是我的最终代码

        public static string MainStamping(string docname, List<string> imagePath, string mediaField)
        {
            string filename = ConfigurationManager.AppSettings["LocalFolder"] + docname + ".pdf";
            FileStream pdfOutputFile = new FileStream(filename, FileMode.Create);
            PdfConcatenate pdfConcatenate = new PdfConcatenate(pdfOutputFile);
            PdfReader result = null;
            for (int i = 0; i < imagePath.Count; i++)
            {
                result = CreatePDFDocument1(imagePath[i], mediaField);
                pdfConcatenate.AddPages(result);
            }
            pdfConcatenate.Close();
            return filename;
        }
        public static PdfReader CreatePDFDocument1(string imagePath, string mediaField)
        {
            PdfReader pdfReader = null;
            string pdfPortrait = ConfigurationManager.AppSettings["PdfPortraitTemplate"];
            string pdfLandscape = ConfigurationManager.AppSettings["PdfLandscapeTemplate"];
            iTextSharp.text.Image instanceImg = iTextSharp.text.Image.GetInstance(imagePath);
            if ((instanceImg.ScaledHeight >= instanceImg.ScaledWidth) || (instanceImg.ScaledWidth <= 714 ))
            {
                pdfReader = new PdfReader(pdfPortrait);
            }
            else
            {
                pdfReader = new PdfReader(pdfLandscape);
            }
            MemoryStream memoryStream = new MemoryStream();
            PdfStamper pdfStamper = new PdfStamper(pdfReader, memoryStream);
            AcroFields testForm = pdfStamper.AcroFields;
            testForm.SetField("MediaField", mediaField);
            PdfContentByte overContent = pdfStamper.GetOverContent(1);
            IList<AcroFields.FieldPosition> fieldPositions = testForm.GetFieldPositions("ImageField");
            if (fieldPositions == null || fieldPositions.Count <= 0) throw new ApplicationException("Error locating field");
            AcroFields.FieldPosition fieldPosition = fieldPositions[0];
            iTextSharp.text.Rectangle imageRect = new Rectangle(fieldPosition.position.Top, fieldPosition.position.Left, fieldPosition.position.Bottom, fieldPosition.position.Right);
            instanceImg.ScaleToFit(imageRect.Height, -1 * imageRect.Width);
            instanceImg.SetAbsolutePosition(fieldPosition.position.Left, (fieldPosition.position.Top - (instanceImg.ScaledHeight)));
            overContent.AddImage(instanceImg);
            pdfStamper.FormFlattening = true;
            pdfStamper.Close();
            PdfReader resultReader = new PdfReader(memoryStream.ToArray());
            pdfReader.Close();
            return resultReader;
        }

谢谢，