c# - 来自预定义温度的多页PDF文档

我需要使用一些预定义的公司模板以PDF格式生成发票报告。我可以使用iTextSharp创建/生成单页 PDF报告。

问题:当发票对帐单跨越 MULTIPLE PAGES 时，就会出现问题。我无法将报告(发票对帐单)扩展到下一页(第二页)。如果无法将所有数据容纳在一页上，则应在使用公司模板的同时将其写在第二页上。

该模板位于以下路径中:

HostingEnvironment.MapPath("~/Content/InvoiceTemplate/invoiceTemplate.pdf")

我正在使用iTextSharp库创建文档。以下是用于生成PDF的代码:

public class pdfStatementController : Controller {

        Models.DYNAMICS_EXTEntities _db = new Models.DYNAMICS_EXTEntities();

        //
        // GET: /pdfStatement/


        public ActionResult SendPdfStatement(string InvoiceNumber) {
            try {
                InvoiceNumber = InvoiceNumber.Trim();

                ObjectParameter[] parameters = new ObjectParameter[1];
                parameters[0] = new ObjectParameter("InvoiceNumber", InvoiceNumber);

                List<Models.Statement> statementList = new List<Models.Statement>();
                statementList = _db.ExecuteFunction<Models.Statement>("uspInvoiceStatement", parameters).ToList<Models.Statement>();
                pdfStatementController.WriteInTemplate(statementList);

                return RedirectToAction("Invoice", "Invoice", new { id = statementList.FirstOrDefault().Customer_ID.ToString().Trim() });
            } catch (Exception e) {
                return View("Error");
            }
        }

    public static void WriteInTemplate(List<Models.Statement> statementList) {
        string invoiceNumber = statementList.FirstOrDefault().Invoice.ToString().Trim();
        string month = null;
        string day = null;
        string year = null;

        PdfReader pdfReader = new PdfReader(
                                  HostingEnvironment.MapPath(
                                       "~/Content/InvoiceTemplate/invoiceTemplate.pdf"));
        FileStream fileStream = new FileStream(
                                   HostingEnvironment.MapPath(
                                      "~/Content/reports/" + invoiceNumber + ".pdf"),
                                      FileMode.Create);
        PdfStamper pdfStamper = new PdfStamper(pdfReader, fileStream);
        AcroFields pdfFields = pdfStamper.AcroFields;

        pdfFields.SetField("BillToCompany", statementList.FirstOrDefault().BillToCompany.ToString().Trim().ToUpper());
        pdfFields.SetField("BillToContact", statementList.FirstOrDefault().BillToContact.ToString().Trim().ToUpper());
        pdfFields.SetField("CustomerId", statementList.FirstOrDefault().Customer_ID);
        pdfFields.SetField("InvoiceNumber", statementList.FirstOrDefault().Invoice.ToString().Trim());
        pdfFields.SetField("JobNumber", statementList.FirstOrDefault().JobNumber.ToString().Trim());
        pdfFields.SetField("Caller", statementList.FirstOrDefault().Caller.ToString().Trim());

        pdfStamper.FormFlattening = true; // generate a flat PDF
        pdfStamper.Close();
        pdfReader.Close();
    }
}

最佳答案

您的代码看起来不错，只缺少几个中间步骤。

由于每个页面都使用相同的PDF模板(当需要生成两个或更多页面时)，因此可以使用PdfStamper或Document对象，而不是使用PdfSmartCopy将内容直接添加到PdfCopy中。

仍然需要PdfStamper。但是，在这种情况下，它用于在迭代Models.Statement集合时创建一个内存中(单个)页面，其中填充了数据。

换句话说，PdfSmartCopy/PdfCopy维护整个语句(总页数)，而PdfStamper用作缓冲区，可将单个语句逐页添加到PDF。这是一个简单的工作示例HTTP处理程序(.ashx):

<%@ WebHandler Language="C#" Class="copyFillTemplate" %>
using System;
using System.Collections.Generic;
using System.IO;
using System.Web;
using iTextSharp.text;
using iTextSharp.text.pdf;

public class copyFillTemplate : IHttpHandler {
  public void ProcessRequest (HttpContext context) {
    HttpServerUtility Server = context.Server;
    HttpResponse Response = context.Response;
    Response.ContentType = "application/pdf";
// template used to test __this__ example;
// replace with __your__ PDF template
    string pdfTemplatePath = Server.MapPath(
      "~/app_data/template.pdf"
    );
// this example's test data; replace with __your__ data collection
    List<Statement> statementList = Statement.GetStatements();

// COPY FROM HERE

    using (Document document = new Document()) {
// PdfSmartCopy reduces PDF file size by reusing parts
// of the PDF template, but uses more memory. you can
// replace PdfSmartCopy with PdfCopy if memory is an issue
      using (PdfSmartCopy copy = new PdfSmartCopy(
        document, Response.OutputStream)
      )
      {
        document.Open();
// used to test this example
        int counter = 0;
// generate one page per statement
        foreach (Statement statment in statementList) {
          ++counter;
// replace this with your PDF form template
          PdfReader reader = new PdfReader(pdfTemplatePath);
          using (var ms = new MemoryStream()) {
            using (PdfStamper stamper = new PdfStamper(reader, ms)) {
              AcroFields form = stamper.AcroFields;
// replace this with your field data for each page
              form.SetField("title", counter.ToString());
              stamper.FormFlattening = true;
            }
            reader = new PdfReader(ms.ToArray());
// add one page at a time; assumes your template is only one page.
// if your template is more than one page you will need to
// call GetImportedPage() for each page in your template
            copy.AddPage(copy.GetImportedPage(reader, 1));
          }
        }
      }

// COPY TO HERE

    }
  }
  public bool IsReusable { get { return false; } }

  public class Statement {
    public string FieldName, FieldValue;
    public static List<Statement> GetStatements() {
      List<Statement> s = new List<Statement>();
      for (int i = 0; i < 5; ++i) {s.Add(new Statement());}
      return s;
    }
  }
}

希望内嵌评论有所帮助。而且您显然需要删除替换一些我用来测试示例代码的部分。