Edit Metadata of PDF File with C# [closed]

Answer 1

For PDFSharp: If you would like to change/add the metadata on the Custom Properties of a PDF you can use the PdfDocument.Info.Elements object.

    String filename = @"d:\temp\Hugo-input.pdf";
    String outputfile = @"d:\temp\Hugo-output.pdf";
    PdfDocument document = PdfReader.Open(filename);
    document.Info.Elements.Add(new KeyValuePair("/MyKey",new PdfString("MyValue")));
    document.Save(outputfile);

Always start a custom key with a slash!

You can find the key and value when you open this document in Adobe Acrobat Reader -> File -> Properties -> Custom.

This works with PDFSharp 1.32