C# PDF NuGet（開發者的工作原理）

using IronPdf;

// Instantiate Renderer
var renderer = new ChromePdfRenderer();

// Create a PDF from an HTML string using C#
var pdf = renderer.RenderHtmlAsPdf("Hello World");

// Export to a file or Stream
pdf.SaveAs("output.pdf");

Imports IronPdf

' Instantiate Renderer
Private renderer = New ChromePdfRenderer()

' Create a PDF from an HTML string using C#
Private pdf = renderer.RenderHtmlAsPdf("Hello World")

' Export to a file or Stream
pdf.SaveAs("output.pdf")

using IronPdf;

// Define multi-page HTML content
const string html = @"Hello Iron
                      This is 1st Page

                      This is 2nd Page

                      This is 3rd Page";

var renderer = new ChromePdfRenderer();
var pdf = renderer.RenderHtmlAsPdf(html);

// Take the first page
var page1doc = pdf.CopyPage(0);
page1doc.SaveAs("Split1.pdf");

// Take the pages 2 & 3
var page23doc = pdf.CopyPages(1, 2);
page23doc.SaveAs("Split2.pdf");

Imports IronPdf

' Define multi-page HTML content
Private Const html As String = "Hello Iron
                      This is 1st Page

                      This is 2nd Page

                      This is 3rd Page"

Private renderer = New ChromePdfRenderer()
Private pdf = renderer.RenderHtmlAsPdf(html)

' Take the first page
Private page1doc = pdf.CopyPage(0)
page1doc.SaveAs("Split1.pdf")

' Take the pages 2 & 3
Dim page23doc = pdf.CopyPages(1, 2)
page23doc.SaveAs("Split2.pdf")

using IronPdf;

// Load an existing PDF document
var pdf = PdfDocument.FromFile("input.pdf");

// Set encryption and password protection
pdf.Encrypt(PdfDocument.EncryptionAlgorithm.AES, 256, "ownerPassword", "userPassword");

// Save the encrypted PDF document
pdf.SaveAs("encrypted_output.pdf");

Imports IronPdf

' Load an existing PDF document
Private pdf = PdfDocument.FromFile("input.pdf")

' Set encryption and password protection
pdf.Encrypt(PdfDocument.EncryptionAlgorithm.AES, 256, "ownerPassword", "userPassword")

' Save the encrypted PDF document
pdf.SaveAs("encrypted_output.pdf")

using IronPdf;

// Open an Encrypted File, alternatively create a new PDF from HTML
var pdf = PdfDocument.FromFile("encrypted.pdf", "password");

// Edit file metadata
pdf.MetaData.Author = "Satoshi Nakamoto";
pdf.MetaData.Keywords = "SEO, Friendly";
pdf.MetaData.ModifiedDate = System.DateTime.Now;

Imports System
Imports IronPdf

' Open an Encrypted File, alternatively create a new PDF from HTML
Private pdf = PdfDocument.FromFile("encrypted.pdf", "password")

' Edit file metadata
pdf.MetaData.Author = "Satoshi Nakamoto"
pdf.MetaData.Keywords = "SEO, Friendly"
pdf.MetaData.ModifiedDate = DateTime.Now

using IronPdf;

// Stamps a Watermark onto a new or existing PDF
var renderer = new ChromePdfRenderer();

var pdf = renderer.RenderUrlAsPdf("https://www.nuget.org/packages/IronPdf");
pdf.ApplyWatermark("SAMPLE", 30, IronPdf.Editing.VerticalAlignment.Middle, IronPdf.Editing.HorizontalAlignment.Center);
pdf.SaveAs(@"C:\Path\To\Watermarked.pdf");

Imports IronPdf

' Stamps a Watermark onto a new or existing PDF
Private renderer = New ChromePdfRenderer()

Private pdf = renderer.RenderUrlAsPdf("https://www.nuget.org/packages/IronPdf")
pdf.ApplyWatermark("SAMPLE", 30, IronPdf.Editing.VerticalAlignment.Middle, IronPdf.Editing.HorizontalAlignment.Center)
pdf.SaveAs("C:\Path\To\Watermarked.pdf")