在 iText7 (.NET) 中为现有 PDF 的每一页添加页脚

Question

我正在使用模板文件在运行时在 itext7.pdfHTML 中构建 PDF。 我想为生成的 PDF 的每一页添加一个页脚，它有两页，但由于某种原因，页脚只出现在第二页上。

我正在尝试从 iText 网站构建这个示例。 该示例处理页码，但由于我只是将 static 文本添加到我的文档中，因此原理是相同的。 这是我的代码：

string footer = "This is the footer".
string body = "<span>This is raw HTML</span>";

//create a temporary PDF with the raw HTML, made from my template and given data
private void createPDF()
{
    destination = System.IO.Path.Combine(HttpContext.Current.Server.MapPath("~/pdf_repo"), "tempFile.pdf");

    ConverterProperties properties = new ConverterProperties();
    properties.SetBaseUri(HttpContext.Current.Server.MapPath("~/templates/"));

    HtmlConverter.ConvertToPdf(body, new FileStream(destination, FileMode.Create), properties);

    addFooter(id);
}

//modify the PDF file created above by adding the footer
private void addFooter(string id)
{
    string newFile = System.IO.Path.Combine(HttpContext.Current.Server.MapPath("pdf_repo", "finalFile.pdf");

    PdfDocument pdfDoc = new PdfDocument(new PdfReader(destination), new PdfWriter(newFile));
    Document doc = new Document(pdfDoc);

    Paragraph foot = new Paragraph(footer);
    foot.SetFontSize(8);

    float x = 300; //559
    float y = 0; //806

    int numberOfPages = pdfDoc.GetNumberOfPages();
    for (int i = 1; i <= numberOfPages; i++)
    {
        doc.ShowTextAligned(foot, x, y, TextAlignment.CENTER, VerticalAlignment.BOTTOM);
    }

    doc.Close();

    //delete temporary PDF
    File.Delete(destination);
}

我尝试在 addFooter() "for" 循环中将 i 设置为 0，但这并不能解决问题。 如何让页脚出现在每一页上？

Answer 1

是的，您没有指定将页脚添加到哪个页面，因此它仅将其添加到整个文档的底部。 尝试这个：

注意，唯一的变化是： doc.ShowTextAligned(foot, x, y, i, TextAlignment.CENTER, VerticalAlignment.BOTTOM);

string footer = "This is the footer".
string body = "<span>This is raw HTML</span>";

//create a temporary PDF with the raw HTML, made from my template and given data
private void createPDF()
{
    destination = System.IO.Path.Combine(HttpContext.Current.Server.MapPath("~/pdf_repo"), "tempFile.pdf");

    ConverterProperties properties = new ConverterProperties();
    properties.SetBaseUri(HttpContext.Current.Server.MapPath("~/templates/"));

    HtmlConverter.ConvertToPdf(body, new FileStream(destination, FileMode.Create), properties);

    addFooter(id);
}

//modify the PDF file created above by adding the footer
private void addFooter(string id)
{
    string newFile = System.IO.Path.Combine(HttpContext.Current.Server.MapPath("pdf_repo", "finalFile.pdf");

    PdfDocument pdfDoc = new PdfDocument(new PdfReader(destination), new PdfWriter(newFile));
    Document doc = new Document(pdfDoc);

    Paragraph foot = new Paragraph(footer);
    foot.SetFontSize(8);

    float x = 300; //559
    float y = 0; //806

    int numberOfPages = pdfDoc.GetNumberOfPages();
    for (int i = 1; i <= numberOfPages; i++)
    {
        doc.ShowTextAligned(foot, x, y, i, TextAlignment.CENTER, VerticalAlignment.BOTTOM);
    }

    doc.Close();

    //delete temporary PDF
    File.Delete(destination);
}