XMLWorkerHelper 不包含在 c# 中采用 0 arguments 的构造函数

Question

i am trying to pdf generate using html template in mvc4 and i have adding xmlworker packages and write a following code. i will build my solution then show in following error. XMLWorkerHelper does not contain a constructor that takes 0 arguments Please suggest me... Controller:-

 public void abcd()
            {
                try
                {
                    string UniqueNumber = Request.QueryString["UniqueNumber"];
                    string strFileName = UniqueNumber;
                    string strFileExtension = ".pdf";
                    string strContentType = FileManager.FileContentType_application_pdf;
                    string strExportData = string.Empty;
                    Document pdfDoc = new Document(PageSize.A4, 43f, 50f, 5f, 50f);
                    HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
                    var output = new MemoryStream();
                    StringWriter sw = new StringWriter();
                    XMLWorkerHelper htw = new XMLWorkerHelper();
                    StringReader sr;
                    sr = new StringReader(Convert.ToString(ExportData.UserDetails(UniqueNumber)));
                    PdfWriter.GetInstance(pdfDoc, output);
                    pdfDoc.Open();
                    htmlparser.Parse(sr);
                    pdfDoc.Close();
                    strFileName = strFileName.Replace(" - ", "-").Replace(" ", "-").Replace("--", "-");
                    Response.ClearContent();
                    Response.Buffer = true;
                    Response.AddHeader("content-disposition", string.Format("attachment; filename={0}{1}",                 strFileName, strFileExtension));
                    Response.ContentType = strContentType;
                    Response.Charset = "";
                    Response.BinaryWrite(output.ToArray());
                    Response.Flush();
                    Response.End();

                }
                catch (Exception ex)
                {
                    //

                }
            }

Answer 1

It looks like the Singleton pattern is used within this assembly Dip.

Please replace your current code, XMLWorkerHelper htw = new XMLWorkerHelper(); with this XMLWorkerHelper htw = XMLWorkerHelper.GetInstance(); and give it a shot.

As a side note, you may want to look into the IDisposable interface. Check if any of the objects your are "newing" up implement it and dispose of them.