Question

我正在下载文件并将更改的文件发送给最终用户在sharepoint 2010中抛出httphandler，但有时我收到错误＆＃34;该过程无法访问文件＆＃39; ...＆＃39;因为它被另一个进程使用了＃34;这是我的代码：

string myFile="MypdfFile.pdf";
string downloadFilePath = @"C:\Windows\Temp";
if (!Directory.Exists(downloadFilePath))
{
    Directory.CreateDirectory(downloadFilePath);
}

string downloadFilePathAndName = downloadFilePath + "\\" + myFile.Name;
newFile = downloadFilePathAndName;
content = myFile.OpenBinary();                                                     

using (PdfReader pdfReader = new PdfReader(content))
{                                                                                                  
    var fileStream = new FileStream(newFile, FileMode.Create, FileAccess.Write,FileShare.ReadWrite);
    var document = new Document(pdfReader.GetPageSizeWithRotation(1));
    var writer = PdfWriter.GetInstance(document, fileStream);
    document.Open();                                                        

    for (var i = 1; i <= pdfReader.NumberOfPages; i++)
    {
        document.NewPage();
        var baseFont = BaseFont.CreateFont(BaseFont.HELVETICA_BOLD, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
        var importedPage = writer.GetImportedPage(pdfReader, i);
        var contentByte = writer.DirectContent;
        contentByte.BeginText();
        contentByte.SetFontAndSize(baseFont, 12);
        string mytext = " ";                                                          

        contentByte.ShowTextAligned(2, mytext, 100, 200, 0);
        contentByte.EndText();
        contentByte.AddTemplate(importedPage, 0, 0);
    }

    document.Close();
    writer.Close();
    fileStream.Dispose();
    fileStream.Close();
    pdfReader.Dispose();
    pdfReader.Close();  

}

我已将FileStream保留在using语句中，但这也无法解决问题。

Answer 1

将FileStream保留在另一个using内并不足够 - 您还需要在using()语句中包含 it 。您也不需要Dispose() using {/ 1}}。

试试这个（未经测试）：

using (var pdfReader = new PdfReader(content))
using (var fileStream = new FileStream(newFile, FileMode.Create, FileAccess.Write,FileShare.ReadWrite))
using (var document = new Document(pdfReader.GetPageSizeWithRotation(1)))
using (var writer = PdfWriter.GetInstance(document, fileStream))
{
  document.Open();                                                        
  for (var i = 1; i <= pdfReader.NumberOfPages; i++)
  {
    document.NewPage();
    var baseFont = BaseFont.CreateFont(BaseFont.HELVETICA_BOLD, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
    var importedPage = writer.GetImportedPage(pdfReader, i);
    var contentByte = writer.DirectContent;
    contentByte.BeginText();
    contentByte.SetFontAndSize(baseFont, 12);
    string mytext = " ";                                                          

    contentByte.ShowTextAligned(2, mytext, 100, 200, 0);
    contentByte.EndText();
    contentByte.AddTemplate(importedPage, 0, 0);
  }
  // These lines may be unnecessary.
  writer.Close();
  document.Close();
  fileStream.Close();
  pdfReader.Close();
}

错误：进程无法访问文件“...”，因为它正由另一个进程使用

1 个答案: