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我现在更新了代码，最后几行是:
reader.Close();
f++;
if (f >= orderedList.Count) continue;
reader = new PdfReader(targetFolder + orderedList[f]);
// we retrieve the total number of pages
n = reader.NumberOfPages;
pdfNewPageFlag = true;
reader.Close();
}
}
并且文档已成功完成，但最终的 PDF 已损坏(我假设是因为它没有正确关闭)
作为 Word 到 PDF 转换和合并过程的一部分，我正在运行以下方法将所有 PDF 合并为 1 个 super PDF(使用 iTextSharp.text.pdf):
public void Pdfs(string targetPdf, List<string> orderedList, string targetFolder, string spSite)
{
var f = 0;
// we create a reader for a certain document
var reader = new PdfReader(targetFolder + orderedList[f]);
// we retrieve the total number of pages
var n = reader.NumberOfPages;
// step 1: creation of a document-object
var document = new iTextSharp.text.Document(reader.GetPageSizeWithRotation(1));
// step 2: we create a writer that listens to the document
var writer = PdfWriter.GetInstance(document, new FileStream(targetPdf, FileMode.Create));
// step 3: we open the document
document.Open();
var cb = writer.DirectContent;
PdfImportedPage page;
int rotation;
// step 4: we add content
var pdfPageName = 0;
var pdfNewPageFlag = true;
while (f < orderedList.Count)
{
var i = 0;
while (i < n)
{
i++;
document.SetPageSize(reader.GetPageSizeWithRotation(i));
document.NewPage();
if (pdfNewPageFlag)
{
var chapter = new iTextSharp.text.Chapter(orderedList[pdfPageName], pdfPageName + 1);
document.Add(chapter);
pdfNewPageFlag = false;
pdfPageName++;
}
page = writer.GetImportedPage(reader, i);
rotation = reader.GetPageRotation(i);
if (rotation == 90 || rotation == 270)
{
cb.AddTemplate(page, 0, -1f, 1f, 0, 0, reader.GetPageSizeWithRotation(i).Height);
}
else
{
cb.AddTemplate(page, 1f, 0, 0, 1f, 0, 0);
}
}
f++;
if (f >= orderedList.Count) continue;
reader = new PdfReader(targetFolder + orderedList[f]);
// we retrieve the total number of pages
n = reader.NumberOfPages;
pdfNewPageFlag = true;
}
// step 5: we close the document
document.Close();
}
此方法还会在每个原始文档的开头创建一个书签。文件全部合并后，我将调用此方法删除文件:
private static void DeletePdfs()
{
// Delete the files
foreach (var file in orderedListPdfFileNames)
{
var newFileName = tempfolder + file;
File.Delete(newFileName);
}
}
但是当尝试实际删除文件时，我看到了这个异常:
An unhandled exception of type 'System.IO.IOException' occurred in mscorlib.dll
Additional information: The process cannot access the file '\file\IT\SK\test\HrDocs\Cover.pdf' because it is being used by another process.
在 PDFs 方法中，我尝试在 之前和之后调用 ，但随后我收到消息 writer.Close() 和 reader.Close() >document.Close()Cannot close a document which is already closed。
有人能帮我解决这个问题或给我指明正确的方向吗？我似乎无法弄清楚合并过程的哪一部分正在锁定文件!
请您参考如下方法:
这只是没有在正确的地方关闭读者的情况。
正如 mkl 在评论中提到的，如果 document.Close() 在关闭阅读器后失败，那么我需要在之后关闭阅读器。
在下面的修改中，我在创建后将每个读者添加到列表中，最后它们都关闭了:
public void Pdfs(string targetPdf, List<string> orderedList, string targetFolder, string spSite)
{
var readerlist = new List<PdfReader>();
var f = 0;
// we create a reader for a certain document
var reader = new PdfReader(targetFolder + orderedList[f]);
readerlist.Add(reader);
// we retrieve the total number of pages
var n = reader.NumberOfPages;
// step 1: creation of a document-object
var document = new iTextSharp.text.Document(reader.GetPageSizeWithRotation(1));
// step 2: we create a writer that listens to the document
var writer = PdfWriter.GetInstance(document, new FileStream(targetPdf, FileMode.Create));
// step 3: we open the document
document.Open();
var cb = writer.DirectContent;
PdfImportedPage page;
int rotation;
// step 4: we add content
var pdfPageName = 0;
var pdfNewPageFlag = true;
while (f < orderedList.Count)
{
var i = 0;
while (i < n)
{
i++;
document.SetPageSize(reader.GetPageSizeWithRotation(i));
document.NewPage();
if (pdfNewPageFlag)
{
var chapter = new iTextSharp.text.Chapter(orderedList[pdfPageName], pdfPageName + 1);
document.Add(chapter);
pdfNewPageFlag = false;
pdfPageName++;
}
page = writer.GetImportedPage(reader, i);
rotation = reader.GetPageRotation(i);
if (rotation == 90 || rotation == 270)
{
cb.AddTemplate(page, 0, -1f, 1f, 0, 0, reader.GetPageSizeWithRotation(i).Height);
}
else
{
cb.AddTemplate(page, 1f, 0, 0, 1f, 0, 0);
}
}
f++;
if (f >= orderedList.Count) continue;
reader = new PdfReader(targetFolder + orderedList[f]);
readerlist.Add(reader);
// we retrieve the total number of pages
n = reader.NumberOfPages;
pdfNewPageFlag = true;
}
// step 5: we close the document
document.Close();
foreach (var rdr in readerlist)
{
rdr.Close();
}
}
