iTextSharp文件操作并显示到FileStreamResults

Question

我正在尝试使用iTextSharp打开PDF文件,向文件中添加数据集以预填充数据,然后将其保存到流中,以便我可以将其显示给用户.我不想将它本地保存到文件中.我一直收到错误"无法访问已关闭的流".我无法弄清楚哪个流是错误的.

这是我的代码:

public FileStreamResult PushDataIntoPDFStream(string filename)
{     
     var reader = new PdfReader(Path.Combine(Server.MapPath(path), filename));
     var xml = @"<?xml version=""1.0"" encoding=""UTF-8""?>
          <form1>  
             <firstName>test</firstName>
             <lastName>user</lastName>
             <driveCar>0</driveCar>
             <gender>1</gender>
             <birthdate>2011-08-12</birthdate>
             <numPets>4</numPets>
          </form1>";

     using (var outstream = new MemoryStream())
     { 
          using (var stamper = new PdfStamper(reader, outstream))
          {
               var bytes = System.Text.Encoding.UTF8.GetBytes(xml);
               using (var ms = new MemoryStream(bytes))
               {
                    stamper.AcroFields.Xfa.FillXfaForm(ms);
               }
          }

          return new FileStreamResult(outstream, "application/pdf")
          {
                FileDownloadName = "file.pdf";
          };
     }      
  }

Answer 1

在PdfStamper具有.CloseStream在其内的输出流属性; 尝试将其设置为false:

using (var stamper = new PdfStamper(reader, outstream))
{
    stamper.Writer.CloseStream = false;