I'm using itextsharp, but i don't know how to get a thumbnail of the PDF page and then display it in a picturebox. After searching on the Internet, I find that there are hundreds of reference samples on the Internet, but almost no suitable solution.

// pdfFileName is the file Name
PdfReader reader = new PdfReader(pdfFileName);
for (int i = 1; i <= reader.NumberOfPages; i++)
{  
// I need something like PdfPage here
}

Does anyone have experience in this area? Please help. I looked up their document, but still didn't know where to start and get PDF page thumbnail. I don't know whether I need PdfImageObject, but what's next?

This article on XsPDF.com is what you looking for, check out: Get thumbnail of PDF page using csharp

Answers

iTextSharp is really not the exact solution, because they do not support PDF rendering. As Bruce Lowagie, the founder of iText, mentioned in his blog, they have no plans on PDF rendering recently.

I've tried a tool that can get thumbnails of PDF pages, but it's currently only available in alpha. Let me know if you're interested in it.

XsPDF's pdf to image converter can help you. As we see, what your need is to get a small pdf thumbnail, perhaps only 10% of the original size, or 80*120 pixel. It can be defined as required. That’s to see, you can customize the conversion to get PDF thumbnail image.

// Create a PDF converter instance by loading a local file 
PdfImageConverter pdfConverter = new PdfImageConverter("sample.pdf");

for (int i = 0; i < pdfConverter.PageCount; i++)
{  
    // Convert pdf to jpg in customized image size
    Image pageImage = pdfConverter.PageToImage(i, 80, 120);

    // Save converted image to jpeg format
    pageImage.Save("Page " + i + ".jpg", ImageFormat.Jpeg);
}

The PdfImageObject object is used to create "image-like" objects, but it cannot create raster images such as JPG and BMP.