How to insert a new paragraph into an existing PDF using C# and .NET

  1. Add SautinSoft.Document from Nuget.
  2. Load a document.
  3. Find all centered paragraphs.
  4. Set its background to yellow.
  5. Save the document.

Input file:

Insert Paragraph input

Output result:

Insert Paragraph output

Complete code

using System;
using System.IO;
using System.Linq;
using SautinSoft.Document;

namespace Example
{
    class Program
    {
        static void Main(string[] args)
        {
            // Get your free trial key here:   
            // https://sautinsoft.com/start-for-free/

            InsertParagraph();
        }
        /// <summary>
        /// Inserts a new paragraph into an existing PDF document.
        /// </summary>
        /// <remarks>
        /// Details: https://sautinsoft.com/products/document/help/net/developer-guide/insert-paragraphs-to-pdf-document-net-csharp-vb.php
        /// </remarks>
        static void InsertParagraph()
        {
            string inpFile = @"..\..\..\example.pdf";
            string outFile = @"Result.pdf";

            DocumentCore dc = DocumentCore.Load(inpFile);
            Paragraph p = new Paragraph(dc);
            p.Content.Start.Insert("William Shakespeare is an English poet " +
                "and playwright, recognized as the greatest English-language writer, " +
                "the national poet of England and one of the outstanding playwrights of the world.",
                new CharacterFormat() { Size = 20, FontName = "Verdana", FontColor = new Color(53, 140, 203) });
            p.ParagraphFormat.Alignment = HorizontalAlignment.Justify;

            // Insert the paragraph as 1st element in the 1st section.
            dc.Sections[0].Blocks.Insert(0, p);

            dc.Save(outFile);
            System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(outFile) { UseShellExecute = true });

        }
    }
}

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Imports System
Imports System.IO
Imports System.Linq
Imports SautinSoft.Document

Namespace Example
	Friend Class Program
		Shared Sub Main(ByVal args() As String)
			' Get your free trial key here:   
			' https://sautinsoft.com/start-for-free/

			InsertParagraph()
		End Sub
		''' <summary>
		''' Inserts a new paragraph into an existing PDF document.
		''' </summary>
		''' <remarks>
		''' Details: https://sautinsoft.com/products/document/help/net/developer-guide/insert-paragraphs-to-pdf-document-net-csharp-vb.php
		''' </remarks>
		Private Shared Sub InsertParagraph()
			Dim inpFile As String = "..\..\..\example.pdf"
			Dim outFile As String = "Result.pdf"

			Dim dc As DocumentCore = DocumentCore.Load(inpFile)
			Dim p As New Paragraph(dc)
			p.Content.Start.Insert("William Shakespeare is an English poet " & "and playwright, recognized as the greatest English-language writer, " & "the national poet of England and one of the outstanding playwrights of the world.", New CharacterFormat() With {
				.Size = 20,
				.FontName = "Verdana",
				.FontColor = New Color("#358CCB")
			})
			p.ParagraphFormat.Alignment = HorizontalAlignment.Justify

			' Insert the paragraph as 1st element in the 1st section.
			dc.Sections(0).Blocks.Insert(0, p)

			dc.Save(outFile)
			System.Diagnostics.Process.Start(New System.Diagnostics.ProcessStartInfo(outFile) With {.UseShellExecute = True})

		End Sub
	End Class
End Namespace

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