当内容较长时，itextsharp 不会创建新页面

Question

我从 3 天开始尝试找到制作一个 pdf 文档的方法，如果有任何帮助，我将不胜感激。

我的表单域很少，可以毫无问题地访问和填写。在此字段下方，我想放置动态创建的表。此表可能足够长，可以放在多页上。这是我的问题。我不能在同一页面上添加此表格，表格字段就在它们下方。我找到了合并 pdf 文件的示例。现在我有了这个场景。

1. 制作一份包含填写表单字段的 pdf
2. 用pdfTable制作pdf，总是只有一页，但内容更长
3. 制作从前两个合并的 pdf。第一页是填写的表单字段，第二页是我的 pdfTable。

我只想拥有从第一页开始并在下一页继续的表单字段和表格。

我发布的代码有点乱，但是……

string pdfTemplate = Server.MapPath("~/PDF/") + "invoiceTest.pdf";
        string newFile = Server.MapPath("~/PDF/") + "invoice" + 1 + ".pdf";

        using (FileStream ms = new FileStream(Server.MapPath("~/PDF/") + "invoice" + 1 + ".pdf", FileMode.Create))
        using (FileStream formFile = new FileStream(Server.MapPath("~/PDF/") + "invoiceTest.pdf", FileMode.Open))
        {
            PdfReader reader = new PdfReader(formFile);
            using (Document document = new Document(reader.GetPageSizeWithRotation(1)))
            {
                PdfStamper outStamper = new PdfStamper(reader, ms);
                PdfContentByte body = outStamper.GetOverContent(reader.NumberOfPages);

                document.Open(); //Open document to work with

                AcroFields fields = outStamper.AcroFields;

                BaseFont bfComic = BaseFont.CreateFont(Server.MapPath("~/PDF/") + "trebuc.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
                Font font = new Font(bfComic, 12);

                // UPDATE THE FORM FIELDS
                fields.SetFieldProperty("txtContragentName", "textfont", bfComic, null);
                fields.SetField("txtContragentName", "Фрея");
                fields.SetFieldProperty("txtContragentCode", "textfont", bfComic, null);
                fields.SetField("txtContragentCode", "DGB34TT");
                fields.SetFieldProperty("txtDateCreated", "textfont", bfComic, null);
                fields.SetField("txtDateCreated", "03.06.2013");

                outStamper.Close();
            }
        }

        using (FileStream ms = new FileStream(Server.MapPath("~/PDF/") + "invoice" + 2 + ".pdf", FileMode.Create))
        using (FileStream formFile = new FileStream(Server.MapPath("~/PDF/") + "invoice" + 1 + ".pdf", FileMode.Open))
        {
            PdfReader reader = new PdfReader(formFile);
            using (Document document = new Document(reader.GetPageSizeWithRotation(1)))
            {
                PdfWriter writer = PdfWriter.GetInstance(document, ms);
                document.Open();
                //Paragraph heading = new Paragraph("Page Heading", new Font(Font.FontFamily.HELVETICA, 10f, Font.BOLD));
                //heading.SpacingAfter = 8f;
                //doc.Add(heading);
                string text = @"Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Suspendisse blandit blandit turpis. Nam in lectus ut dolor consectetuer bibendum. Morbi neque ipsum, laoreet id; dignissim et, viverra id, mauris. Nulla mauris elit, consectetuer sit amet, accumsan eget, congue ac, libero. Vivamus suscipit. Nunc dignissim consectetuer lectus. Fusce elit nisi; commodo non, facilisis quis, hendrerit eu, dolor? Suspendisse eleifend nisi ut magna. Phasellus id lectus! Vivamus laoreet enim et dolor. Integer arcu mauris, ultricies vel, porta quis, venenatis at, libero. Donec nibh est, adipiscing et, ullamcorper vitae, placerat at, diam. Integer ac turpis vel ligula rutrum auctor! Morbi egestas erat sit amet diam. Ut ut ipsum? Aliquam non sem. Nulla risus eros, mollis quis, blandit ut; luctus eget, urna. Vestibulum vestibulum dapibus erat. Proin egestas leo a metus?";
                PdfContentByte cb = writer.DirectContent;
                ColumnText columns = new ColumnText(cb);
                //float left, float right, float gutterwidth, int numcolumns
                columns.SetSimpleColumn(40, 20, document.PageSize.Width - 40, document.PageSize.Height - 20);
                //Paragraph para = new Paragraph(text, new Font(Font.FontFamily.HELVETICA, 8f));
                ////para.SpacingAfter = 9f;
                //para.Alignment = Element.ALIGN_JUSTIFIED;
                //for (int i = 0; i < 28; i++)
                //{
                //    columns.AddElement(para);
                //}

                //columns.Go();

                BaseFont bfComic = BaseFont.CreateFont(Server.MapPath("~/PDF/") + "trebuc.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
                Font font = new Font(bfComic, 12);
                PdfPTable table = new PdfPTable(10);
                table.HorizontalAlignment = Element.ALIGN_LEFT;
                table.DefaultCell.HorizontalAlignment = Element.ALIGN_RIGHT;
                table.WidthPercentage = 100;
                PdfPCell cell1 = new PdfPCell(new Phrase("ДАТА", new Font(bfComic, 10f, Font.NORMAL, BaseColor.WHITE))) { HorizontalAlignment = 1, VerticalAlignment = 2 };
                cell1.BackgroundColor = new iTextSharp.text.BaseColor(System.Drawing.ColorTranslator.FromHtml("#808080"));

                PdfPCell cell2 = new PdfPCell(new Phrase("Header spanning 3 columns", new Font(Font.NORMAL, 10f, Font.NORMAL, BaseColor.WHITE))) { HorizontalAlignment = 1 };
                cell2.BackgroundColor = new iTextSharp.text.BaseColor(System.Drawing.ColorTranslator.FromHtml("#808080"));

                table.AddCell(cell1);
                table.AddCell(cell2);
                //dump data to be set
                #region dump data
                for (int i = 0; i < 100; i++)
                {
                    table.AddCell("Col 1 Row 1");
                }

                #endregion

                float[] widths = new float[] { 200f, 200f, 200f, 200f, 100f, 100f, 100f, 100f, 100f, 100f };
                table.SetWidths(widths);
                table.CompleteRow(); //Added - table won't add the final row if its cells are incomplete - safe to have it ending a table
                columns.AddElement(table);
                columns.Go();
            }
        }

        using (FileStream ms = new FileStream(Server.MapPath("~/PDF/") + "invoice" + 3 + ".pdf", FileMode.Create))
        using (FileStream stampedfile = new FileStream(Server.MapPath("~/PDF/") + "invoice" + 1 + ".pdf", FileMode.Open))
        using (FileStream appendfile = new FileStream(Server.MapPath("~/PDF/") + "invoice" + 2 + ".pdf", FileMode.Open))
        {
            PdfReader stampedContentReader = new PdfReader(stampedfile);
            PdfReader appendContentReader = new PdfReader(appendfile);

            using (Document document = new Document(stampedContentReader.GetPageSizeWithRotation(1)))
            {
                PdfCopy pdfCopy = new PdfCopy(document, ms);

                document.Open();

                for (int i = 1; i <= stampedContentReader.NumberOfPages; i++)
                    pdfCopy.AddPage(pdfCopy.GetImportedPage(stampedContentReader, i));

                for (int i = 1; i <= appendContentReader.NumberOfPages; i++)
                    pdfCopy.AddPage(pdfCopy.GetImportedPage(appendContentReader, i));
            }
        }

Answer 1

您的代码确实是一团糟。我将复制/粘贴它，但请理解我不是 C# 开发人员。我只知道 Java，我对 iText 了如指掌（我是它的原始开发者）。

string pdfTemplate = Server.MapPath("~/PDF/") + "invoiceTest.pdf";
string newFile = Server.MapPath("~/PDF/") + "invoice" + 1 + ".pdf";

using (FileStream ms = new FileStream(Server.MapPath("~/PDF/") + "invoice" + 1 + ".pdf", FileMode.Create))
using (FileStream formFile = new FileStream(Server.MapPath("~/PDF/") + "invoiceTest.pdf", FileMode.Open))
{
    PdfReader reader = new PdfReader(formFile);
    // YOU DON'T NEED A DOCUMENT OBJECT HERE!
    // READ THE DOCUMENTATION!!!
    PdfStamper outStamper = new PdfStamper(reader, ms);
    AcroFields fields = outStamper.AcroFields;
    BaseFont bfComic = BaseFont.CreateFont(Server.MapPath("~/PDF/") + "trebuc.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
    // UPDATE THE FORM FIELDS
    fields.SetFieldProperty("txtContragentName", "textfont", bfComic, null);
    fields.SetField("txtContragentName", "Фрея");
    fields.SetFieldProperty("txtContragentCode", "textfont", bfComic, null);
    fields.SetField("txtContragentCode", "DGB34TT");
    fields.SetFieldProperty("txtDateCreated", "textfont", bfComic, null);
    fields.SetField("txtDateCreated", "03.06.2013");
    outStamper.Close();
}

using (FileStream ms = new FileStream(Server.MapPath("~/PDF/") + "invoice" + 2 + ".pdf", FileMode.Create))
using (FileStream formFile = new FileStream(Server.MapPath("~/PDF/") + "invoice" + 1 + ".pdf", FileMode.Open))
{
    PdfReader reader = new PdfReader(formFile);
    // I'm adding extra parameters to change the margins so that they match what you had when you defined your ColumnText object
    using (Document document = new Document(reader.GetPageSizeWithRotation(1), 40, 40, 20, 20))
    {
        PdfWriter writer = PdfWriter.GetInstance(document, ms);
        document.Open();
        // HEADERS ARE ADDED WITH PAGE EVENTS!!!
        // PLEASE READ ABOUT PAGE EVENTS IF YOU NEED PAGE HEADERS
        string text = @"Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Suspendisse blandit blandit turpis. Nam in lectus ut dolor consectetuer bibendum. Morbi neque ipsum, laoreet id; dignissim et, viverra id, mauris. Nulla mauris elit, consectetuer sit amet, accumsan eget, congue ac, libero. Vivamus suscipit. Nunc dignissim consectetuer lectus. Fusce elit nisi; commodo non, facilisis quis, hendrerit eu, dolor? Suspendisse eleifend nisi ut magna. Phasellus id lectus! Vivamus laoreet enim et dolor. Integer arcu mauris, ultricies vel, porta quis, venenatis at, libero. Donec nibh est, adipiscing et, ullamcorper vitae, placerat at, diam. Integer ac turpis vel ligula rutrum auctor! Morbi egestas erat sit amet diam. Ut ut ipsum? Aliquam non sem. Nulla risus eros, mollis quis, blandit ut; luctus eget, urna. Vestibulum vestibulum dapibus erat. Proin egestas leo a metus?";
        BaseFont bfComic = BaseFont.CreateFont(Server.MapPath("~/PDF/") + "trebuc.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
        Font font = new Font(bfComic, 12);
        PdfPTable table = new PdfPTable(10);
        // The next line doesn't make sense if the width percentage is 100%
        // table.HorizontalAlignment = Element.ALIGN_LEFT;
        table.DefaultCell.HorizontalAlignment = Element.ALIGN_RIGHT;
        table.WidthPercentage = 100;
        PdfPCell cell1 = new PdfPCell(new Phrase("ДАТА", new Font(bfComic, 10f, Font.NORMAL, BaseColor.WHITE))) { HorizontalAlignment = 1, VerticalAlignment = 2 };
        cell1.BackgroundColor = new iTextSharp.text.BaseColor(System.Drawing.ColorTranslator.FromHtml("#808080"));
        PdfPCell cell2 = new PdfPCell(new Phrase("Header spanning 3 columns", new Font(Font.NORMAL, 10f, Font.NORMAL, BaseColor.WHITE))) { HorizontalAlignment = 1 };
        cell2.BackgroundColor = new iTextSharp.text.BaseColor(System.Drawing.ColorTranslator.FromHtml("#808080"));
        table.AddCell(cell1);
        table.AddCell(cell2);
        //dump data to be set
        #region dump data
        for (int i = 0; i < 100; i++)
        {
            table.AddCell("Col 1 Row 1");
        }
        #endregion
        float[] widths = new float[] { 200f, 200f, 200f, 200f, 100f, 100f, 100f, 100f, 100f, 100f };
        table.SetWidths(widths);
        table.CompleteRow(); //Added - table won't add the final row if its cells are incomplete - safe to have it ending a table
        document.Add(table);
    }
}

您在代码的第一部分中犯的主要错误是引入了Document。没有必要这样做。请阅读我的书chapter 6 并查看C# examples。

您在第二部分中犯的主要错误是使用ColumnText，这意味着您想控制布局，但不知道如何处理该控制。如果您使用ColumnText，则需要询问列是否所有内容都被消费了。如果没有，您需要自己创建一个新页面。这一切都在我的书的chapter 3 中进行了解释。

第三部分看起来不错（据我了解 C#）。

我写书是为了让人们从一开始就编写正确的代码来节省时间。我没有写我的书，所以我必须在 * 上复制/粘贴它们；-)