Question

我有一个帮助程序类，可从生成的html片段创建pdf文档。当html很长但我得到

时

Object reference not set to an instance of an object.

这是帮助程序类：

public static void CreatePdf(ContractPdf model, string htmlPath, string cssPath, string savePath)
{
    using (var document = new Document())
        {
            // Create the pdf
            var pdfWriter = PdfWriter.GetInstance(document, new FileStream(savePath, FileMode.OpenOrCreate));
            //pdfWriter.Open();
            document.Open();

            // CSS
            var cssResolver = new StyleAttrCSSResolver();
            var cssStream = new FileStream(cssPath, FileMode.Open);
            var cssFile = XMLWorkerHelper.GetCSS(cssStream);
            cssResolver.AddCss(cssFile);

            // HTMLStringBuilder
            var cssApplier = new CssAppliersImpl();
            var htmlPipelineContext = new HtmlPipelineContext(cssApplier);
            htmlPipelineContext.SetTagFactory(Tags.GetHtmlTagProcessorFactory());

            // PIPELINES
            var pdfWriterPipeline = new PdfWriterPipeline(document, pdfWriter);
            var htmlPipeline = new HtmlPipeline(htmlPipelineContext, pdfWriterPipeline);
            var cssResolverPipeline = new CssResolverPipeline(cssResolver, htmlPipeline);
            var xmlWorker = new XMLWorker(cssResolverPipeline, true);
            var xmlParser = new XMLParser(xmlWorker);
            var html = File.ReadAllText(htmlPath);

            var st = new StringTemplate(html);
            st.SetAttribute("Dto", model);
            html = st.ToString();

            var textReader = new StringReader(html);

            xmlParser.Parse(textReader);
        }

这是引发错误的最后一行。很抱歉含糊，但这是我继承的代码。总体来说还可以，但是当有很多html时，我会得到上面的错误。

这是堆栈跟踪：

at iTextSharp.text.pdf.ColumnText.SetSimpleVars(ColumnText org)   
at iTextSharp.text.pdf.ColumnText.SetACopy(ColumnText org)
at iTextSharp.text.pdf.PdfPCell.GetMaxHeight()   
at iTextSharp.text.pdf.PdfPRow.CalculateHeights()   
at iTextSharp.text.pdf.PdfPRow.get_MaxHeights()   
at iTextSharp.text.pdf.PdfPTable.GetRowHeight(Int32 idx, Boolean firsttime)
at iTextSharp.text.pdf.ColumnText.GoComposite(Boolean simulate)
at iTextSharp.text.pdf.ColumnText.Go(Boolean simulate, IElement elementToGo)   
at iTextSharp.text.pdf.PdfPRow.SplitRow(PdfPTable table, Int32 rowIndex, Single new_height)   
at iTextSharp.text.pdf.ColumnText.GoComposite(Boolean simulate)   
at iTextSharp.text.pdf.ColumnText.Go(Boolean simulate, IElement elementToGo)   
at iTextSharp.text.pdf.PdfDocument.AddPTable(PdfPTable ptable)   
at iTextSharp.text.pdf.PdfDocument.Add(IElement element)   
at iTextSharp.text.Document.Add(IElement element)   
at iTextSharp.tool.xml.pipeline.end.PdfWriterPipeline.Write(IWorkerContext context, ProcessObject po)   
at iTextSharp.tool.xml.pipeline.end.PdfWriterPipeline.Close(IWorkerContext context, Tag t, ProcessObject po)   
at iTextSharp.tool.xml.XMLWorker.EndElement(String tag, String ns)   
at iTextSharp.tool.xml.parser.XMLParser.EndElement()  
at iTextSharp.tool.xml.parser.state.ClosingTagState.Process(Char character)   
at iTextSharp.tool.xml.parser.XMLParser.ParseWithReader(TextReader reader)   
at Domain.Utils.PdfHelper.CreatePdf(ContractPdf model, String htmlPath, String cssPath, String savePath) in D:\\Projects\\Zest4\\Domain\\Utils\\PDFHelper.cs:line 87   
at Zest4.Helpers.OrderHelper.Print(ContractPdf model, String templateDir, String pdfPath) in D:\\Projects\\Zest4\\Zest4\\Helpers\\OrderHelper.cs:line 120  
at Zest4.Helpers.OrderHelper.Print(Controller controller, HttpServerUtilityBase server, Order order, IOrderRepository _orderRep, ICustomerRepository _customerRep, IMobileConnectionRepository _mobileRep, IContactRepository _contactRep, IAddressRepository _addressRep, IPartnerRepository _partnerRep, IUserRepository _userRep) in D:\\Projects\\Zest4\\Zest4\\Helpers\\OrderHelper.cs:line 101   
at Zest4.Controllers.OrderController.Print(OrderPrintModel model) in D:\\Projects\\Zest4\\Zest4\\Controllers\\OrderController.cs:line 429"

使用ITextSharp 5.5.0生成Pdf时出错

0 个答案: