如何使用asp.net c#保存pdf生成的文件到项目文件夹?

Question

我已经从html生成了一个pdf文件，现在我需要将它保存到我的项目中的一个文件夹中。

我可以在本地下载生成的pdf文件，但是当我把它发送到文件夹时，它被损坏了，无法打开。

public void CreateHTML(ComplaintIntakeData cd)
{
string formHtml = "<table class="MsoNormal">";
string complaintTypeHtml = PCSUtilities.GetComplaintTypeHTML(cd);
string providerHtml = "";
if (cd.Providers != null && cd.Providers.Count > 0)
{
providerHtml = PCSUtilities.GetProviderHTML(cd);
}
string facilityHtml = PCSUtilities.GetFacilityHTML(cd);
string anonymousHtml = PCSUtilities.GetAnonymousHTML(cd);
string contactHtml = PCSUtilities.GetContactHTML(cd);
string patientHtml = PCSUtilities.GetPatientHTML(cd);
string detailsHtml = PCSUtilities.GetComplaintDetailsHTML(cd);
formHtml = formHtml + complaintTypeHtml + providerHtml + facilityHtml + anonymousHtml + contactHtml + patientHtml + detailsHtml + "</table>";
formHtml = formHtml.Replace("''", """);
// Load HTML template for letter and replace template fields with provider data
string htmlContent = File.ReadAllText(Server.MapPath("~/ComplaintIntakeForm.html"));
htmlContent = htmlContent.Replace("&lt;%ComplaintInformation%&gt;", formHtml);
string fileName = "ComplaintIntakeFile_" + cd.ComplaintGuid.ToString() +".pdf";
using (MemoryStream memStream = new MemoryStream())
{
try
{
// Load up a new PDF doc.
iTextSharp.text.Document pdfDoc = new iTextSharp.text.Document(PageSize.LETTER);
PdfWriter writer = PdfWriter.GetInstance(pdfDoc, memStream);
// writer.CompressionLevel = PdfStream.NO_COMPRESSION;
// Make document tagged PDFVERSION_1_7 
writer.SetPdfVersion(PdfWriter.PDF_VERSION_1_7);
writer.SetTagged();
// Set document metadata
writer.ViewerPreferences = PdfWriter.DisplayDocTitle;
pdfDoc.AddLanguage("en-US");
pdfDoc.AddTitle("Complaint Intake Form");
writer.CreateXmpMetadata();
pdfDoc.Open();
var tagProcessors = (DefaultTagProcessorFactory)Tags.GetHtmlTagProcessorFactory();
//tagProcessors.RemoveProcessor(HTML.Tag.IMG);
//tagProcessors.AddProcessor(HTML.Tag.IMG, new CustomImageTagProcessor());
var cssFiles = new CssFilesImpl();
cssFiles.Add(XMLWorkerHelper.GetInstance().GetDefaultCSS());
var cssResolver = new StyleAttrCSSResolver(cssFiles);
var charset = Encoding.UTF8;
var context = new HtmlPipelineContext(new CssAppliersImpl(new XMLWorkerFontProvider()));
context.SetAcceptUnknown(true).AutoBookmark(true).SetTagFactory(tagProcessors);
var htmlPipeline = new HtmlPipeline(context, new PdfWriterPipeline(pdfDoc, writer));
var cssPipeline = new CssResolverPipeline(cssResolver, htmlPipeline);
var worker = new XMLWorker(cssPipeline, true);
var xmlParser = new XMLParser(true, worker, charset);
try
{
using (var sr = new StringReader(htmlContent))
{
xmlParser.Parse(sr);
// xmlParser.Flush();
}
}
catch (Exception e)
{
Response.Write(e.Message);
}

pdfDoc.Close();
//writer.Close();
///this creates a pdf download.
Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "attachment; filename=" + fileName);
Response.OutputStream.Write(memStream.GetBuffer(), 0, memStream.GetBuffer().Length);
}
catch (Exception ex)
{
System.Windows.Forms.MessageBox.Show("The following error occurred:n" + ex.ToString());
}
}
}

，添加以下内容创建文件。文件已创建，但已损坏，无法以pdf格式打开

using (FileStream file = new FileStream(Server.MapPath("~/tempFiles/") + fileName, FileMode.CreateNew))
{
byte[] bytes = new byte[memStream.Length];
memStream.Read(bytes, 0, memStream.Length);
file.Write(bytes, 0, bytes.Length);
}

Answer 1

我认为这个答案是相关的:

将MemoryStream复制到FileStream并保存文件?

你的两个代码片段使用memStream和memString，没有看到上下文中的所有代码，我猜。假设memStream是一个包含PDF内容的流，您可以将其写入如下文件:

using (FileStream file = new FileStream(Server.MapPath("~/tempFiles/") + fileName, FileMode.CreateNew))
{
memStream.Position = 0;
memStream.CopyTo(file);
}

Answer 2

最后将新的FileStream调用移动到PdfWriter中。GetInstance方法代替memStream变量。并且能够摆脱使用文件流代码在一起。

PdfWriter writer = PdfWriter.GetInstance(pdfDoc, new FileStream(Server.MapPath(path)+"/" + fileName, FileMode.CreateNew));