API .NET open source per l'elaborazione PDF

Comando NuGet

 Install-Package PdfSharp

Con Visual Studio puoi installare NuGet Package Manager per accedere facilmente ai pacchetti NuGet. Funziona con VS 2012 Express così come con le edizioni della community di VS 2013 e VS 2015. In Visual Studio vai su "Strumenti" => "Estensioni e aggiornamenti..." per installare NuGet Package Manager se non lo si dispone ancora. NuGet Package Manager scaricherà il pacchetto per te, lo installerà e aggiungerà un riferimento al tuo progetto.

Crea PDF usando C#

// Create a new PDF document
PdfDocument pdfDocument = new PdfDocument();
// Create an empty page
PdfPage pdfPage = pdfDocument.AddPage();
// Get an XGraphics object for drawing
XGraphics xGraphics = XGraphics.FromPdfPage(pdfPage);
// Create a font
XFont xFont = new XFont("Verdana", 20, XFontStyle.BoldItalic);
// Draw the text
xGraphics.DrawString("File Format Developer Guide", xFont, XBrushes.Black,
    new XRect(0, 0, pdfPage.Width, pdfPage.Height),
    XStringFormats.Center);
// Save the document...
pdfDocument.Save("fileformat.pdf");
    

Crea un'annotazione di testo PDF tramite C#

 // Create a PDF text annotation
PdfTextAnnotation textAnnot = new PdfTextAnnotation();
textAnnot.Title = "This is the title";
textAnnot.Subject = "This is the subject";
textAnnot.Contents = "This is the contents of the annotation.\rThis is the 2nd line.";
textAnnot.Icon = PdfTextAnnotationIcon.Note;
gfx.DrawString("The first text annotation", font, XBrushes.Black, 30, 50, XStringFormats.Default);
// Convert rectangle from world space to page space. This is necessary because the annotation is
// placed relative to the bottom left corner of the page with units measured in point.
XRect rect = gfx.Transformer.WorldToDefaultPage(new XRect(new XPoint(30, 60), new XSize(30, 30)));
textAnnot.Rectangle = new PdfRectangle(rect);
// Add the annotation to the page
page.Annotations.Add(textAnnot);

Combina documenti tramite Java

 // Open the input files
PdfDocument inputDocument1 = PdfReader.Open(filename1, PdfDocumentOpenMode.Import);
PdfDocument inputDocument2 = PdfReader.Open(filename2, PdfDocumentOpenMode.Import);
// Create the output document
PdfDocument outputDocument = new PdfDocument();
// Show consecutive pages facing. Requires Acrobat 5 or higher.
outputDocument.PageLayout = PdfPageLayout.TwoColumnLeft;
XFont font = new XFont("Verdana", 10, XFontStyle.Bold);
XStringFormat format = new XStringFormat();
format.Alignment = XStringAlignment.Center;
format.LineAlignment = XLineAlignment.Far;
XGraphics gfx;
XRect box;
int count = Math.Max(inputDocument1.PageCount, inputDocument2.PageCount);
for (int idx = 0; idx < count; idx++)
{
// Get page from 1st document
PdfPage page1 = inputDocument1.PageCount > idx ?
inputDocument1.Pages[idx] : new PdfPage();
// Get page from 2nd document
PdfPage page2 = inputDocument2.PageCount > idx ?
inputDocument2.Pages[idx] : new PdfPage();
// Add both pages to the output document
page1 = outputDocument.AddPage(page1);
page2 = outputDocument.AddPage(page2);
// Write document file name and page number on each page
gfx = XGraphics.FromPdfPage(page1);
box = page1.MediaBox.ToXRect();
box.Inflate(0, -10);
gfx.DrawString(String.Format("{0} • {1}", filename1, idx + 1),
font, XBrushes.Red, box, format);
gfx = XGraphics.FromPdfPage(page2);
box = page2.MediaBox.ToXRect();
box.Inflate(0, -10);
gfx.DrawString(String.Format("{0} • {1}", filename2, idx + 1),
font, XBrushes.Red, box, format);
}
// Save the document...
const string filename = "CompareDocument1_tempfile.pdf";
outputDocument.Save(filename);