在iTextSharp的使用区块内打开第二个PdfReader

Question

我有以下代码可以打开PDF并添加一些文本和图像。有一次，我打开第二个PDF文件，将它封装在一个Image中并将其添加到PDF中。操作成功完成后，我想删除第二个PDF（我包装在图像中的一个）。问题是该文件现在被锁定，直到我重置我的ASP.NET应用程序。

在GetImageFromPdf方法中，您可以看到我正在创建第二个PdfReader实例。问题是，如果我关闭这个阅读器，我的Create方法中的阅读器也会关闭！难道我做错了什么？有另一种方法来实现我的目标吗？

下面是相关代码：

public void Create(string outputFilePath, bool preview = false) 
{ 
    using (PdfReader reader = new PdfReader(FilePath)) 
    { 
     using (PdfStamper stamper = new PdfStamper(reader, new FileStream(outputFilePath, FileMode.Create))) 
     { 
      PdfContentByte canvas = stamper.GetOverContent(1); 

      ... 

      AddMap(canvas, stamper); 
     } 
    } 
} 

... 

private void AddMap(PdfContentByte Canvas, PdfStamper stamper) 
{ 
    Image ImageWrapper = GetImageFromPdf(stamper.Writer, _MapFilePath); 

    //set the position and scale the image 
    ImageWrapper.ScaleAbsolute(152.5f, 152.5f); 
    ImageWrapper.SetAbsolutePosition(58.5f, 197.5f); 

    Canvas.AddImage(ImageWrapper); 
} 

... 

public Image GetImageFromPdf(PdfWriter Writer, string MapFilePath) 
{ 
    //since vector images are not supported natively by iTextSharp 
    //we have saved the location maps as PDF (originally in eps format) 
    //we use GetImportedPage to import the file, and wrap it in an Image object so we can scale it 

    //If I close this reader, the reader in the Create method is closed as well 
    PdfReader reader = new PdfReader(MapFilePath); 
    PdfImportedPage ImportedPage = Writer.GetImportedPage(reader, 1); 

    return Image.GetInstance(ImportedPage); 
} 

Answer 1

试试这个

using (PdfReader reader = new PdfReader(FilePath),PdfReader reader1 = new PdfReader(MapFilePath)) 
{ 
pass that reader1 object to AddMap method. 
}