PDFsharp save to MemoryStream

问题:

I want to save a PdfSharp.Pdf.PdfDocument by its Save method to a Stream, but it doesn't attach the PDF header settings to it. So when I read back the Stream and return it to the user, he see that the PDF file is invalid. Is there a solution to attach the PDF header settings when PDFsharp saves to memory?

回答1:

If you think there is an issue with PdfDocument.Save, then please report this on the PDFsharp forum (but please be more specific with your error description). Your "solution" looks like a hack to me. "pdfRenderer.Save" calls "PdfDocument.Save" internally. Whatever the problem is - your "solution" still calls the same Save routine.

Edit: To get a byte[] containing a PDF file, you only have to call:

MemoryStream stream = new MemoryStream();
document.Save(stream, false);
byte[] bytes = stream.ToArray();

Early versions of PDFsharp do not reset the stream position.

So you have to call

ms.Seek(0, SeekOrigin.Begin); 

to reset the stream position before reading from the stream; this is no longer required for current versions.

Using ToArray can often be used instead of reading from the stream.

Edit 2: instead of stream.ToArray() it may be more efficient to use stream.GetBuffer(), but this buffer is usually larger than the PDF file and you only have to use stream.Length bytes from that buffer. Very useful for method that take a byte[] along with a length parameter.

回答2:

So the solution:

MigraDoc.DocumentObjectModel.Document doc = new MigraDoc.DocumentObjectModel.Document();
MigraDoc.Rendering.DocumentRenderer renderer = new DocumentRenderer(doc);
MigraDoc.Rendering.PdfDocumentRenderer pdfRenderer = new MigraDoc.Rendering.PdfDocumentRenderer();
pdfRenderer.PdfDocument = pDoc;
pdfRenderer.DocumentRenderer = renderer;
using (MemoryStream ms = new MemoryStream())
{
  pdfRenderer.Save(ms, false);
  byte[] buffer = new byte[ms.Length];
  ms.Seek(0, SeekOrigin.Begin);
  ms.Flush();
  ms.Read(buffer, 0, (int)ms.Length);
}

There is this MigraDoc stuff which comes with PdfSharp, but i hardly found any proper doc/faq for it. After hours of googling i've found a snippet which was something like this. Now it works.

回答3:

I found simpler solution:

byte[] fileContents = null; 
using(MemoryStream stream = new MemoryStream()) 
{ 
    pdfDoc.Save(stream, true); 
    fileContents = stream.ToArray(); 
}

Source: http://usefulaspandcsharp.wordpress.com/2010/03/09/save-a-pdf-to-a-byte-array-using-pdf-sharpmigradoc/

回答4:

For MigraDoc (ver 1.30) I could save it with

PdfDocumentRenderer renderer = new PdfDocumentRenderer(true, PdfSharp.Pdf.PdfFontEmbedding.Always);
renderer.Document = report.m_Document;

renderer.RenderDocument();


using (MemoryStream stream = new MemoryStream())
{
    renderer.PdfDocument.Save(stream, false);
    ... your code in here

}

回答5:

Thanks Misnyo Solution. But for me it works like this:

        Document document = new Document();
        PdfDocumentRenderer pdfRenderer = new PdfDocumentRenderer();   

        //Add to document here.......

        //render the document with pdf renderer
        pdfRenderer.Document = document;
        pdfRenderer.RenderDocument();

        //Save renderer result into stream   
        using(MemoryStream ms = new MemoryStream())
        {
            pdfRenderer.PdfDocument.Save(ms, false);
            byte[] buffer = new byte[ms.Length];
            ms.Seek(0, SeekOrigin.Begin);
            ms.Flush();
            ms.Read(buffer, 0, (int)ms.Length);
            ms.Position = 0;
        }