C# 尝试使用iTextSharp v4合并PDF会引发异常
我尝试了两个不同的代码示例,它们都抛出了相同的异常:C# 尝试使用iTextSharp v4合并PDF会引发异常,c#,pdf,pdf-generation,itextsharp,C#,Pdf,Pdf Generation,Itextsharp,我尝试了两个不同的代码示例,它们都抛出了相同的异常: System.InvalidCastException was unhandled by user code Message=Unable to cast object of type 'iTextSharp.text.pdf.PdfArray' to type 'iTextSharp.text.pdf.PRIndirectReference'. Source=itextsharp StackTrace: at iT
System.InvalidCastException was unhandled by user code
Message=Unable to cast object of type 'iTextSharp.text.pdf.PdfArray' to type 'iTextSharp.text.pdf.PRIndirectReference'.
Source=itextsharp
StackTrace:
at iTextSharp.text.pdf.PdfCopy.CopyObject(PdfObject inp)
at iTextSharp.text.pdf.PdfCopy.CopyDictionary(PdfDictionary inp)
at iTextSharp.text.pdf.PdfCopy.AddPage(PdfImportedPage iPage)
本例使用PdfCopy。我还用PdfWriter试用过:
public MemoryStream Merge(MemoryStream outputStream,List<PdfReader> documents)
{
if (outputStream == null || !outputStream.CanWrite)
throw new Exception("OutputStream is null or you can't write to it.");
Document newDocument = null;
try
{
newDocument = new Document(documents[0].GetPageSizeWithRotation(1));
PdfCopy pdfWriter = new PdfCopy(newDocument, outputStream);
newDocument.Open();
//PdfContentByte pdfContentByte = pdfWriter.DirectContent;
foreach (PdfReader pdfReader in documents)
{
for (int page = 1; page <= pdfReader.NumberOfPages; page++)
{
//newDocument.NewPage();
PdfImportedPage importedPage = pdfWriter.GetImportedPage(pdfReader, page);
pdfWriter.AddPage(importedPage);
}
}
}
finally
{
outputStream.Flush();
if (newDocument != null)
newDocument.Close();
outputStream.Close();
}
return outputStream;
}
公共内存流合并(内存流输出流,列表文档)
{
if(outputStream==null | |!outputStream.CanWrite)
抛出新异常(“OutputStream为null或无法写入它”);
Document newDocument=null;
尝试
{
newDocument=新文档(文档[0]。GetPageSizeWithRotation(1));
PdfCopy pdfWriter=新的PdfCopy(newDocument,outputStream);
newDocument.Open();
//PdfContentByte PdfContentByte=pdfWriter.DirectContent;
foreach(文档中的PdfReader PdfReader)
{
对于(int page=1;page),我怀疑您的PDF文件不好。我们可以看看吗?