SpirePDF C# HTML转PDF教程及库对比

using IronPdf;

// Disable local disk access or cross-origin requests
Installation.EnableWebSecurity = true;

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

// Create a PDF from an HTML string using C#
var pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>");
pdf.SaveAs("output.pdf");

// Advanced Example with HTML Assets
// Load external html assets: images, CSS and JavaScript.
// An optional BasePath 'C:\site\assets\' is set as the file location to load assets from
var myAdvancedPdf = renderer.RenderHtmlAsPdf("<img src='icons/iron.png'>", @"C:\site\assets\");
myAdvancedPdf.SaveAs("html-with-assets.pdf");

Imports IronPdf

' Disable local disk access or cross-origin requests
Installation.EnableWebSecurity = True

' Instantiate Renderer
Dim renderer = New ChromePdfRenderer()

' Create a PDF from an HTML string using C#
Dim pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>")
pdf.SaveAs("output.pdf")

' Advanced Example with HTML Assets
' Load external html assets: images, CSS and JavaScript.
' An optional BasePath 'C:\site\assets\' is set as the file location to load assets from
Dim myAdvancedPdf = renderer.RenderHtmlAsPdf("<img src='icons/iron.png'>", "C:\site\assets\")
myAdvancedPdf.SaveAs("html-with-assets.pdf")

using Spire.Pdf;
using Spire.Pdf.HtmlConverter;
using System.IO;
using System.Threading;
using System.Drawing;

namespace ConvertHtmlStringToPdfWithoutPlugin
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a PdfDocument object
            PdfDocument doc = new PdfDocument();

            //Create a PdfPageSettings object
            PdfPageSettings setting = new PdfPageSettings();

            //Save page size and margins through the object
            setting.Size = new SizeF(1000, 1000);
            setting.Margins = new Spire.Pdf.Graphics.PdfMargins(20);

            //Create a PdfHtmlLayoutFormat object
            PdfHtmlLayoutFormat htmlLayoutFormat = new PdfHtmlLayoutFormat();

            //Set IsWaiting property to true
            htmlLayoutFormat.IsWaiting = true;

            //Read html string from a .html file
            string htmlString = File.ReadAllText(@"C:\Users\Administrator\Desktop\Document\Html\Sample.html");
            //Load HTML from html string using LoadFromHTML method
            Thread thread = new Thread(() =>
            { doc.LoadFromHTML(htmlString, true, setting, htmlLayoutFormat); });
            thread.SetApartmentState(ApartmentState.STA);
            thread.Start();
            thread.Join();

            //Save to a PDF file
            doc.SaveToFile("HtmlStringToPdf.pdf");
        }
    }
}

Imports Spire.Pdf
Imports Spire.Pdf.HtmlConverter
Imports System.IO
Imports System.Threading
Imports System.Drawing

Namespace ConvertHtmlStringToPdfWithoutPlugin
	Friend Class Program
		Shared Sub Main(ByVal args() As String)
			'Create a PdfDocument object
			Dim doc As New PdfDocument()

			'Create a PdfPageSettings object
			Dim setting As New PdfPageSettings()

			'Save page size and margins through the object
			setting.Size = New SizeF(1000, 1000)
			setting.Margins = New Spire.Pdf.Graphics.PdfMargins(20)

			'Create a PdfHtmlLayoutFormat object
			Dim htmlLayoutFormat As New PdfHtmlLayoutFormat()

			'Set IsWaiting property to true
			htmlLayoutFormat.IsWaiting = True

			'Read html string from a .html file
			Dim htmlString As String = File.ReadAllText("C:\Users\Administrator\Desktop\Document\Html\Sample.html")
			'Load HTML from html string using LoadFromHTML method
			Dim thread As New Thread(Sub()
				doc.LoadFromHTML(htmlString, True, setting, htmlLayoutFormat)
			End Sub)
			thread.SetApartmentState(ApartmentState.STA)
			thread.Start()
			thread.Join()

			'Save to a PDF file
			doc.SaveToFile("HtmlStringToPdf.pdf")
		End Sub
	End Class
End Namespace

using IronPdf;
using System;

// 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 = DateTime.Now;

// Edit file security settings
pdf.SecuritySettings.RemovePasswordsAndEncryption();
pdf.SecuritySettings.MakePdfDocumentReadOnly("secret-key");
pdf.SecuritySettings.AllowUserAnnotations = false;
pdf.SecuritySettings.AllowUserCopyPasteContent = false;
pdf.SecuritySettings.AllowUserFormData = false;
pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights;

// Change or set the document encryption password
pdf.Password = "my-password";
pdf.SaveAs("secured.pdf");

Imports IronPdf
Imports System

' 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

' Edit file security settings
pdf.SecuritySettings.RemovePasswordsAndEncryption()
pdf.SecuritySettings.MakePdfDocumentReadOnly("secret-key")
pdf.SecuritySettings.AllowUserAnnotations = False
pdf.SecuritySettings.AllowUserCopyPasteContent = False
pdf.SecuritySettings.AllowUserFormData = False
pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights

' Change or set the document encryption password
pdf.Password = "my-password"
pdf.SaveAs("secured.pdf")

using Spire.Pdf;
using Spire.Pdf.Security;

//Create a PdfDocument object
PdfDocument pdf = new PdfDocument();

//Load a sample PDF file
pdf.LoadFromFile(@"E:\Files\sample.pdf");

//Encrypt the PDF file with password
pdf.Security.Encrypt("open", "permission", PdfPermissionsFlags.Print 
 PdfPermissionsFlags.CopyContent, PdfEncryptionKeySize.Key128Bit);

//Save the result file
pdf.SaveToFile("Encrypt.pdf", FileFormat.PDF);

Imports Spire.Pdf
Imports Spire.Pdf.Security

'Create a PdfDocument object
Private pdf As New PdfDocument()

'Load a sample PDF file
pdf.LoadFromFile("E:\Files\sample.pdf")

'Encrypt the PDF file with password
pdf.Security.Encrypt("open", "permission", PdfPermissionsFlags.Print PdfPermissionsFlags.CopyContent, PdfEncryptionKeySize.Key128Bit)

'Save the result file
pdf.SaveToFile("Encrypt.pdf", FileFormat.PDF)

using IronPdf;

PdfDocument pdf = PdfDocument.FromFile("novel.pdf");

// Redact 'are' phrase from all pages
pdf.RedactTextOnAllPages("are");

pdf.SaveAs("redacted.pdf");

Imports IronPdf

Private pdf As PdfDocument = PdfDocument.FromFile("novel.pdf")

' Redact 'are' phrase from all pages
pdf.RedactTextOnAllPages("are")

pdf.SaveAs("redacted.pdf")

using Spire.Pdf;
using Spire.Pdf.Graphics;

// Specify the input PDF file path
        string inputPdfFilePath = "path/to/your/input.pdf";

        // Specify the output redacted PDF file path
        string outputPdfFilePath = "path/to/your/redacted_output.pdf";

        // Create a new PdfDocument object
        PdfDocument pdfDocument = new PdfDocument();

        // Load the existing PDF document
        pdfDocument.LoadFromFile(inputPdfFilePath);

        // Redact content on each page
        foreach (PdfPageBase page in pdfDocument.Pages)
        {
            // Define the area to redact (e.g., coordinates and size of the rectangle)
            RectangleF redactArea = new RectangleF(100, 100, 200, 50); // Example coordinates and size

            // Apply redaction
            page.Canvas.DrawRectangle(new PdfSolidBrush(Color.Black), redactArea);
        }      
        // Save the redacted PDF document
        pdfDocument.SaveToFile(outputPdfFilePath);

Imports Spire.Pdf
Imports Spire.Pdf.Graphics

' Specify the input PDF file path
		Private inputPdfFilePath As String = "path/to/your/input.pdf"

		' Specify the output redacted PDF file path
		Private outputPdfFilePath As String = "path/to/your/redacted_output.pdf"

		' Create a new PdfDocument object
		Private pdfDocument As New PdfDocument()

		' Load the existing PDF document
		pdfDocument.LoadFromFile(inputPdfFilePath)

		' Redact content on each page
		For Each page As PdfPageBase In pdfDocument.Pages
			' Define the area to redact (e.g., coordinates and size of the rectangle)
			Dim redactArea As New RectangleF(100, 100, 200, 50) ' Example coordinates and size

			' Apply redaction
			page.Canvas.DrawRectangle(New PdfSolidBrush(Color.Black), redactArea)
		Next page
		' Save the redacted PDF document
		pdfDocument.SaveToFile(outputPdfFilePath)

using IronPdf;
using IronPdf.Signing;
using System.Security.Cryptography.X509Certificates;

ChromePdfRenderer renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>foo</h1>");

// Create X509Certificate2 object with X509KeyStorageFlags set to Exportable
X509Certificate2 cert = new X509Certificate2("IronSoftware.pfx", "123456", X509KeyStorageFlags.Exportable);

// Create PDF digital signature with the PdfSignature object
var sig = new PdfSignature(cert);

// Sign PDF document
pdf.Sign(sig);
pdf.SaveAs("signed.pdf");

Imports IronPdf
Imports IronPdf.Signing
Imports System.Security.Cryptography.X509Certificates

Private renderer As New ChromePdfRenderer()
Private pdf As PdfDocument = renderer.RenderHtmlAsPdf("<h1>foo</h1>")

' Create X509Certificate2 object with X509KeyStorageFlags set to Exportable
Private cert As New X509Certificate2("IronSoftware.pfx", "123456", X509KeyStorageFlags.Exportable)

' Create PDF digital signature with the PdfSignature object
Private sig = New PdfSignature(cert)

' Sign PDF document
pdf.Sign(sig)
pdf.SaveAs("signed.pdf")

using system;
using System.Drawing;
using Spire.Pdf;
using Spire.Pdf.Security;
using Spire.Pdf.Graphics;

//Create a PdfDocument object
PdfDocument doc = new PdfDocument();

//Load a sample PDF file
doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");

//Load the certificate
PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");

//Create a PdfSignature object and specify its position and size
PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
24
RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 260 - 54 , 200, 260, 110);
signature.Bounds = rectangleF;
signature.Certificated = true;

//Set the graphics mode to ImageAndSignDetail
signature.GraphicsMode = GraphicMode.SignImageAndSignDetail;

//Set the signature content
signature.NameLabel = "Signer:";
signature.Name = "Gary";
signature.ContactInfoLabel = "Phone:";
signature.ContactInfo = "0123456";
signature.DateLabel = "Date:";
signature.Date = DateTime.Now;
signature.LocationInfoLabel = "Location:";
signature.LocationInfo = "USA";
signature.ReasonLabel = "Reason:";
signature.Reason = "I am the author";
signature.DistinguishedNameLabel = "DN:";
signature.DistinguishedName = signature.Certificate.IssuerName.Name;

//Set the signature image source
signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\handwrittingSignature.png");

//Set the signature font
signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS", 12f, FontStyle.Regular));

//Set the document permission to forbid changes but allow form fill
signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges 
 PdfCertificationFlags.AllowFormFill;

//Save to file
doc.SaveToFile("VisiableSignature.pdf");
doc.Close();

Imports system
Imports System.Drawing
Imports Spire.Pdf
Imports Spire.Pdf.Security
Imports Spire.Pdf.Graphics

'Create a PdfDocument object
Private doc As New PdfDocument()

'Load a sample PDF file
doc.LoadFromFile("C:\Users\Administrator\Desktop\sample.pdf")

'Load the certificate
Dim cert As New PdfCertificate("C:\Users\Administrator\Desktop\MyCertificate.pfx", "e-iceblue")

'Create a PdfSignature object and specify its position and size
Dim signature As New PdfSignature(doc, doc.Pages(doc.Pages.Count - 1), cert, "MySignature")
24 RectangleF rectangleF = New RectangleF(doc.Pages(0).ActualSize.Width - 260 - 54, 200, 260, 110)
signature.Bounds = rectangleF
signature.Certificated = True

'Set the graphics mode to ImageAndSignDetail
signature.GraphicsMode = GraphicMode.SignImageAndSignDetail

'Set the signature content
signature.NameLabel = "Signer:"
signature.Name = "Gary"
signature.ContactInfoLabel = "Phone:"
signature.ContactInfo = "0123456"
signature.DateLabel = "Date:"
signature.Date = DateTime.Now
signature.LocationInfoLabel = "Location:"
signature.LocationInfo = "USA"
signature.ReasonLabel = "Reason:"
signature.Reason = "I am the author"
signature.DistinguishedNameLabel = "DN:"
signature.DistinguishedName = signature.Certificate.IssuerName.Name

'Set the signature image source
signature.SignImageSource = PdfImage.FromFile("C:\Users\Administrator\Desktop\handwrittingSignature.png")

'Set the signature font
signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS", 12F, FontStyle.Regular))

'Set the document permission to forbid changes but allow form fill
signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges PdfCertificationFlags.AllowFormFill

'Save to file
doc.SaveToFile("VisiableSignature.pdf")
doc.Close()

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("<h2 style='color:red'>SAMPLE</h2>", 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("<h2 style='color:red'>SAMPLE</h2>", 30, IronPdf.Editing.VerticalAlignment.Middle, IronPdf.Editing.HorizontalAlignment.Center)
pdf.SaveAs("C:\Path\To\Watermarked.pdf")

using Spire.Pdf;
using Spire.Pdf.Graphics;
using System.Drawing;

//Create a PdfDocument object
PdfDocument pdf = new PdfDocument();

//Load a sample PDF document
pdf.LoadFromFile(@"C:\Users\Administrator\Desktop\sample.pdf");

//Create a PdfTrueTypeFont object
PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("Arial", 50f), true);

//Set the watermark text
string text = "CONFIDENTIAL";

//Measure the text size
SizeF textSize = font.MeasureString(text);

            //Calculate the values of two offset variables,
            //which will be used to calculate the translation amount of the coordinate system
float offset1 = (float)(textSize.Width * System.Math.Sqrt(2) / 4);
float offset2 = (float)(textSize.Height * System.Math.Sqrt(2) / 4);

        //Traverse all the pages in the document
    foreach (PdfPageBase page in pdf.Pages)
        {
    //Set the page transparency
    page.Canvas.SetTransparency(0.8f);

    //Translate the coordinate system by specified coordinates
    page.Canvas.TranslateTransform(page.Canvas.Size.Width / 2 - offset1 - offset2, page.Canvas.Size.Height / 2 + offset1 - offset2);

        //Rotate the coordinate system 45 degrees counterclockwise
        page.Canvas.RotateTransform(-45);

        //Draw watermark text on the page
        page.Canvas.DrawString(text, font, PdfBrushes.DarkGray, 0, 0);
            }

//Save the changes to another file
pdf.SaveToFile("TextWatermark.pdf");

Imports System
Imports Spire.Pdf
Imports Spire.Pdf.Graphics
Imports System.Drawing

'Create a PdfDocument object
Private pdf As New PdfDocument()

'Load a sample PDF document
pdf.LoadFromFile("C:\Users\Administrator\Desktop\sample.pdf")

'Create a PdfTrueTypeFont object
Dim font As New PdfTrueTypeFont(New Font("Arial", 50F), True)

'Set the watermark text
Dim text As String = "CONFIDENTIAL"

'Measure the text size
Dim textSize As SizeF = font.MeasureString(text)

			'Calculate the values of two offset variables,
			'which will be used to calculate the translation amount of the coordinate system
Dim offset1 As Single = CSng(textSize.Width * Math.Sqrt(2) / 4)
Dim offset2 As Single = CSng(textSize.Height * Math.Sqrt(2) / 4)

		'Traverse all the pages in the document
	For Each page As PdfPageBase In pdf.Pages
	'Set the page transparency
	page.Canvas.SetTransparency(0.8F)

	'Translate the coordinate system by specified coordinates
	page.Canvas.TranslateTransform(page.Canvas.Size.Width \ 2 - offset1 - offset2, page.Canvas.Size.Height \ 2 + offset1 - offset2)

		'Rotate the coordinate system 45 degrees counterclockwise
		page.Canvas.RotateTransform(-45)

		'Draw watermark text on the page
		page.Canvas.DrawString(text, font, PdfBrushes.DarkGray, 0, 0)
	Next page

'Save the changes to another file
pdf.SaveToFile("TextWatermark.pdf")

using IronPdf;
using IronPdf.Editing;

// Instantiate Renderer
ChromePdfRenderer renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>Example HTML Document!</h1>");

// Create text stamper
TextStamper textStamper = new TextStamper()
{
    Text = "Text Stamper!",
    FontFamily = "Bungee Spice",
    UseGoogleFont = true,
    FontSize = 30,
    IsBold = true,
    IsItalic = true,
    VerticalAlignment = VerticalAlignment.Top,
};

// Stamp the text stamper
pdf.ApplyStamp(textStamper);
pdf.SaveAs("stampText.pdf");

// Create image stamper
ImageStamper imageStamper = new ImageStamper(new Uri("https://ironpdf.com/img/svgs/iron-pdf-logo.svg"))
{
    VerticalAlignment = VerticalAlignment.Top,
};

// Stamp the image stamper
pdf.ApplyStamp(imageStamper, 0);
pdf.SaveAs("stampImage.pdf");

Imports IronPdf
Imports IronPdf.Editing

' Instantiate Renderer
Private renderer As New ChromePdfRenderer()
Private pdf As PdfDocument = renderer.RenderHtmlAsPdf("<h1>Example HTML Document!</h1>")

' Create text stamper
Private textStamper As New TextStamper() With {
	.Text = "Text Stamper!",
	.FontFamily = "Bungee Spice",
	.UseGoogleFont = True,
	.FontSize = 30,
	.IsBold = True,
	.IsItalic = True,
	.VerticalAlignment = VerticalAlignment.Top
}

' Stamp the text stamper
pdf.ApplyStamp(textStamper)
pdf.SaveAs("stampText.pdf")

' Create image stamper
Dim imageStamper As New ImageStamper(New Uri("https://ironpdf.com/img/svgs/iron-pdf-logo.svg")) With {.VerticalAlignment = VerticalAlignment.Top}

' Stamp the image stamper
pdf.ApplyStamp(imageStamper, 0)
pdf.SaveAs("stampImage.pdf")

using Spire.Pdf;
using Spire.Pdf.Graphics;
using System.Drawing;

//save graphics state
PdfGraphicsState state = page.Canvas.Save();

//Draw the text - transform          
PdfFont font = new PdfFont(PdfFontFamily.Helvetica, 18f);
PdfSolidBrush brush1 = new PdfSolidBrush(Color.DeepSkyBlue);
PdfSolidBrush brush2 = new PdfSolidBrush(Color.CadetBlue);
page.Canvas.TranslateTransform(20, 200);
page.Canvas.ScaleTransform(1f, 0.6f);
page.Canvas.SkewTransform(-10, 0);
page.Canvas.DrawString("Go! Turn Around! Go! Go! Go!", font, brush1, 0, 0);
page.Canvas.SkewTransform(10, 0);
page.Canvas.DrawString("Go! Turn Around! Go! Go! Go!", font, brush2, 0, 0);
page.Canvas.ScaleTransform(1f, -1f);
page.Canvas.DrawString("Go! Turn Around! Go! Go! Go!", font, brush2, 0, -2 * 18);

//restore graphics
page.Canvas.Restore(state);

Imports Spire.Pdf
Imports Spire.Pdf.Graphics
Imports System.Drawing

'save graphics state
Private state As PdfGraphicsState = page.Canvas.Save()

'Draw the text - transform          
Private font As New PdfFont(PdfFontFamily.Helvetica, 18F)
Private brush1 As New PdfSolidBrush(Color.DeepSkyBlue)
Private brush2 As New PdfSolidBrush(Color.CadetBlue)
page.Canvas.TranslateTransform(20, 200)
page.Canvas.ScaleTransform(1F, 0.6F)
page.Canvas.SkewTransform(-10, 0)
page.Canvas.DrawString("Go! Turn Around! Go! Go! Go!", font, brush1, 0, 0)
page.Canvas.SkewTransform(10, 0)
page.Canvas.DrawString("Go! Turn Around! Go! Go! Go!", font, brush2, 0, 0)
page.Canvas.ScaleTransform(1F, -1F)
page.Canvas.DrawString("Go! Turn Around! Go! Go! Go!", font, brush2, 0, -2 * 18)

'restore graphics
page.Canvas.Restore(state)

using IronPdf;

// Instantiate Renderer
DocxToPdfRenderer renderer = new DocxToPdfRenderer();

// Render from DOCX file
PdfDocument pdf = renderer.RenderDocxAsPdf("Modern-chronological-resume.docx");

// Save the PDF
pdf.SaveAs("pdfFromDocx.pdf");

Imports IronPdf

' Instantiate Renderer
Private renderer As New DocxToPdfRenderer()

' Render from DOCX file
Private pdf As PdfDocument = renderer.RenderDocxAsPdf("Modern-chronological-resume.docx")

' Save the PDF
pdf.SaveAs("pdfFromDocx.pdf")

using Spire.Doc;

// Create a Document object
Document doc = new Document();

// Load a Word document
doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\Sample.docx");

// Save the document to PDF
doc.SaveToFile("ToPDF.pdf", FileFormat.PDF);

// Dispose resources
doc.Dispose();

Imports Spire.Doc

' Create a Document object
Private doc As New Document()

' Load a Word document
doc.LoadFromFile("C:\Users\Administrator\Desktop\Sample.docx")

' Save the document to PDF
doc.SaveToFile("ToPDF.pdf", FileFormat.PDF)

' Dispose resources
doc.Dispose()