itext7從PDF中提取文字vs廢鐵pdf（代碼示例教程）

using PdfSharp.Pdf;
using PdfSharp.Drawing;

// Create a new PDF document
var document = new PdfDocument();
document.Info.Title = "Created with PDFsharp";

// Create an empty page
PdfPage page = document.AddPage();

// Get an XGraphics object for drawing
XGraphics gfx = XGraphics.FromPdfPage(page);

// Create a font
XFont font = new XFont("Verdana", 20, XFontStyle.Bold);

// Draw the text
gfx.DrawString("Hello, PDFsharp!", font, XBrushes.Black,
    new XRect(0, 0, page.Width, page.Height), XStringFormats.Center);

// Save the document
document.Save("HelloWorld.pdf");

Imports PdfSharp.Pdf
Imports PdfSharp.Drawing

' Create a new PDF document
Private document = New PdfDocument()
document.Info.Title = "Created with PDFsharp"

' Create an empty page
Dim page As PdfPage = document.AddPage()

' Get an XGraphics object for drawing
Dim gfx As XGraphics = XGraphics.FromPdfPage(page)

' Create a font
Dim font As New XFont("Verdana", 20, XFontStyle.Bold)

' Draw the text
gfx.DrawString("Hello, PDFsharp!", font, XBrushes.Black, New XRect(0, 0, page.Width, page.Height), XStringFormats.Center)

' Save the document
document.Save("HelloWorld.pdf")

using iText.Kernel.Pdf;
using iText.Layout;
using iText.Layout.Element;

// Create a writer and initiates a PDF document
PdfWriter writer = new PdfWriter("iTextHello.pdf");
var pdf = new PdfDocument(writer);
Document document = new Document(pdf);

// Add a paragraph to the document
document.Add(new Paragraph("Hello, iTextSharp!"));

// Closing the document
document.Close();

Imports iText.Kernel.Pdf
Imports iText.Layout
Imports iText.Layout.Element

' Create a writer and initiates a PDF document
Private writer As New PdfWriter("iTextHello.pdf")
Private pdf = New PdfDocument(writer)
Private document As New Document(pdf)

' Add a paragraph to the document
document.Add(New Paragraph("Hello, iTextSharp!"))

' Closing the document
document.Close()

using IronPdf;

var Renderer = new ChromePdfRenderer();
// Render a simple HTML string as a PDF document
var pdf = Renderer.RenderHtmlAsPdf("<h1>Hello from IronPDF!</h1><p>This was rendered using Chrome.</p>");
// Save the PDF document as a file
pdf.SaveAs("IronPdfHello.pdf");

Imports IronPdf

Private Renderer = New ChromePdfRenderer()
' Render a simple HTML string as a PDF document
Private pdf = Renderer.RenderHtmlAsPdf("<h1>Hello from IronPDF!</h1><p>This was rendered using Chrome.</p>")
' Save the PDF document as a file
pdf.SaveAs("IronPdfHello.pdf")