PDF properties are metadata that provide additional information about a PDF file. Typically, these properties include, but are not limited to, the title of the document, the author, keywords, subject and the application that created the document. When there are a large number of PDF files, adding properties is essential as it can make the files easily retrievable. In this article, you will learn how to programmatically set or get PDF properties using Spire.PDF for .NET.
Install Spire.PDF for .NET
To begin with, you need to add the DLL files included in the Spire.PDF for.NET package as references in your .NET project. The DLL files can be either downloaded from this link or installed via NuGet.
PM> Install-Package Spire.PDF
Set the Properties of a PDF File in C# and VB.NET
Basic PDF document properties such as title, author, subject and keywords make it easier for users to search or retrieve specific documents later on. The following are the detailed steps on how to set these properties using Spire.PDF for .NET.
- Create a PdfDocument instance.
- Load a PDF file using PdfDocument.LoadFromFile() method.
- Get PDF properties using PdfDocument.DocumentInformation property, and then set values for specific document properties such as title, subject and author through Title, Subject and Author properties of PdfDocumentInformation class.
- Save the result PDF file using PdfDocument.SaveToFile () method.
- C#
- VB.NET
using Spire.Pdf;
namespace PDFProperties
{
class Properties
{
static void Main(string[] args)
{
//Create a PdfDocument instance
PdfDocument pdf = new PdfDocument();
//Load a sample PDF document
pdf.LoadFromFile("input.pdf");
//Set the title
pdf.DocumentInformation.Title = "PDF (Portable Document Format)";
//Set the author
pdf.DocumentInformation.Author = "E-iceblue";
//Set the subject
pdf.DocumentInformation.Subject = "Set PDF Properties";
//Set the keywords
pdf.DocumentInformation.Keywords = "NET PDF, Properties, Document";
//Set the producer name
pdf.DocumentInformation.Producer = "Spire.PDF";
//Save the result document
pdf.SaveToFile("PdfProperties.pdf");
}
}
}
Get the Properties of a PDF File in C# and VB.NET
To get specific PDF properties, you can use the corresponding properties under the PdfDocumentInformation class. The following are the detailed steps.
- Create a PdfDocument instance.
- Load a PDF file using PdfDocument.LoadFromFile() method.
- Create a StringBuilder instance.
- Get PDF properties using PdfDocument.DocumentInformation property, and then get specific document properties such as title, author, keyword using properties under PdfDocumentInformation class.
- Append the extracted properties to the StringBuilder instance using StringBuilder.Append() method.
- Write the StringBuilder to a TXT file using File.WriteAllText() method.
- C#
- VB.NET
using Spire.Pdf;
using System.IO;
using System.Text;
namespace GetPdfProperties
{
class Program
{
static void Main(string[] args)
{
//Create a PdfDocument instance
PdfDocument pdf = new PdfDocument();
//Load a sample PDF document
pdf.LoadFromFile("PdfProperties.pdf");
//Create a StringBuilder instance
StringBuilder content = new StringBuilder();
//Get the PDF document properties and append them in the StringBuilder
content.Append("Title: " + pdf.DocumentInformation.Title + "\r\n");
content.Append("Author: " + pdf.DocumentInformation.Author + "\r\n");
content.Append("Subject: " + pdf.DocumentInformation.Subject + "\r\n");
content.Append("Keywords: " + pdf.DocumentInformation.Keywords + "\r\n");
content.Append("PDF Producer: " + pdf.DocumentInformation.Producer + "\r\n");
//Write the StringBuilder to a TXT file
File.WriteAllText("GetPDFProperties.txt", content.ToString());
}
}
}
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