使用 iTextSharp 创建多页 pdf

Creating a multiple pages pdf with iTextSharp

我正在尝试使用 iTextSharp 创建一个多页 pdf,但我在创建一个包含多个页面的循环时遇到了一些问题。

我下面的代码在一页上运行良好;但是,我的内容无法放在一个页面中。谢谢

我如何编写一个循环来在第一个 pdf 页面上写入内容,并将剩余的内容写入第二个、第三个等...到目前为止,我只看到一个页面。谢谢。

        int height = 600;
        int totalPage = 1;
        int oldPage = 1;
        bool cons = false;
        bool st = false;
        foreach (string al in combo)

foreach (string al in combo) //my loop to write on the pdf but "combo" has 100 lines, which would fit into a single page.
{
                string[] word = al.Split(',');

                int strIndex = combo.IndexOf(al);


                if (al.Length != 0)
                {
                    if (word[0].ToString().ToUpper().Contains("(REV")==true && cons == false)
                    {
                        cb.SetFontAndSize(BaseFont.CreateFont(BaseFont.HELVETICA_BOLD, BaseFont.CP1252, BaseFont.NOT_EMBEDDED), 11);

                        cb.BeginText();
                        // put the alignment and coordinates here
                        cb.ShowTextAligned(PdfContentByte.ALIGN_LEFT, "CONSTRUCTION PRINTS", 80, height, 0);

                        cb.EndText();
                        height = height - 20;
                        cons = true;
                    }
                    if (word[0].ToString().ToUpper().Contains("(REV")==false && st == false)
                    {
                        cb.SetFontAndSize(BaseFont.CreateFont(BaseFont.HELVETICA_BOLD, BaseFont.CP1252, BaseFont.NOT_EMBEDDED), 11);

                        cb.BeginText();

                        // put the alignment and coordinates here
                        cb.ShowTextAligned(PdfContentByte.ALIGN_LEFT, "SAG & TENSION CHARTS", 80, height, 0);

                        cb.EndText();
                        height = height - 20;
                        st = true;
                    }
                    cb.SetFontAndSize(BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED), 11);

                    totalPage = totalPage + oldPage;
                    // write the text in the pdf content
                    cb.BeginText();
                    // put the alignment and coordinates here
                    cb.ShowTextAligned(PdfContentByte.ALIGN_LEFT, word[0].ToString().ToUpper(), 80, height, 0);

                    cb.EndText();

                    // write the text in the pdf content
                    cb.BeginText();
                    // put the alignment and coordinates here
                    cb.ShowTextAligned(PdfContentByte.ALIGN_CENTER, "......................................................................................", 335, height, 0);

                    cb.EndText();

                    // write the text in the pdf content
                    cb.BeginText();
                    // put the alignment and coordinates here
                    cb.ShowTextAligned(PdfContentByte.ALIGN_RIGHT, totalPage.ToString(), 500, height, 0);

                    cb.EndText();
                    oldPage = Convert.ToInt32(word[1]);

                }

                height = height - 20;

            }

            //// create the new page and add it to the pdf
            //  reader = new PdfReader(oldFile);//old file
            PdfImportedPage page = writer.GetImportedPage(reader, 1);
            cb.AddTemplate(page, 0, 0);
            //// close the streams and voilá the file should be changed :)

            document.Close();
            reader.Close();
            fs.Close();
            writer.Close();

请转到 official documentation and click Q&A to go to the most frequently asked questions. Pick the Getting started 类别。您首先会看到最流行的 iText 示例(为方便起见,我将其移植到 C#):

// step 1
Document document = new Document();
// step 2
FileStream fs = new FileStream("hello.pdf", FileMode.Create);
PdfWriter.GetInstance(document, fs);
// step 3
document.Open();
// step 4
document.Add(new Paragraph("Hello World!"));
// step 5
document.Close();

在您的代码中,您通过引入 PDF 语法在绝对位置添加文本,例如 BeginText() (BT) / EndText() (ET) / SetFontAndSize() (Tf)。这是创建 PDF 的艰难方式。如果很容易出错,如本题所示:What is causing syntax errors in a page created with iText?

如果您不记得 PDF 参考 (ISO 32000-1),您应该避免使用这样的代码。相反,您可以使用 ParagraphListPdfPTable 等对象...使用 Add() 方法将这些对象添加到 Document 的美妙之处在于一旦页面已满,就会自动触发新页面。您也可以使用以下方式自行触发新页面:

document.NewPage();

如果你想在绝对位置添加文本,iText 提供了方便的方法和对象,例如ColumnText。请参阅我对

的回答

你可以定义一个Rectangle,然后添加ParagraphListPdfPTable等对象……看看问题的答案How to continue an ordered list on a second page? 灵感:

ColumnText ct = new ColumnText(cb);
ct.AddElement(list);
Rectangle rect = new Rectangle(36, 36, 559, 806);
ct.SetSimpleColumn(rect);
int status = ct.Go();
while (ColumnText.HasMoreText(status)) {
    document.NewPage();
    ct.SetSimpleColumn(rect);
    ct.Go();
}

while 循环就是您要查找的循环。