Question

我写了一些代码，通过Itext7将tiff文件转换为pdf文件。但是，当我启动它时，它在方法Image.ImageDataFactory.CreateTiff上陷入了僵局。如果用foreach替换Parallel.Foreach，则所有工作正常。我做错了什么？


void Run(List<string> tiffsPaths)
{
   Parallel.ForEach(tiffsPaths, ConvertTiffToPdf)
}

void ConvertTiffToPdf(string tiffPath)
{
   var fileName = Path.GetFileNameWithoutExtension(tiffPath);
   var pdfPath = Path.Combine(this.outputPicPath, fileName + ".pdf");

   var pdfWriter = new PdfWriter(pdfPath);
   var document = new PdfDocument(pdfWriter);
   var workDir = Path.GetDirectoryName(SourceFile) ?? string.Empty;
   var pageNum = 1;

   var tiffImage = Image.ImageDataFactory.CreateTiff(new Uri(tiffPath), true, pageNum, true);
   var tiffPageSize = new Geom.Rectangle(tiffImage.GetWidth(), 
   tiffImage.GetHeight());
   var newPage = document.AddNewPage(new Geom.PageSize(tiffPageSize));
   var canvas = new PdfCanvas(newPage);
   canvas.AddImage(tiffImage, tiffPageSize, false);

   document.Close();
   pdfWriter.Close();
}

UPD 在类public IRandomAccessSource CreateSource(Uri url)的方法itext.io.source.RandomAccessSourceFactory中的 IText7 源代码中发现了发生死锁的位置。这段代码：

WebRequest wr = WebRequest.Create(url);
wr.Credentials = CredentialCache.DefaultCredentials;
Stream isp = wr.GetResponse().GetResponseStream();

Answer 1

将var tiffImage = Image.ImageDataFactory.CreateTiff(new Uri(tiffPath), true, pageNum, true);替换为var tiffImage = Image.ImageDataFactory.CreateTiff(File.ReadAllBytes(path), true, pageNum, true);，一切正常

如何在并行foreach循环中使用Itext7的CreateTiff方法？

1 个答案: