IronPDF和EvoPdf：比较

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>");

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

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

using EvoPdf;

// create the converter object in your code where you want to run conversion
HtmlToPdfConverter converter = new HtmlToPdfConverter();

// convert the HTML string to a PDF file
converter.ConvertHtmlToFile("<b>Hello World</b> from EVO PDF !", null, "HtmlToFile.pdf");

// convert HTML pages from URL to a PDF file
string htmlPageURL = "http://www.evopdf.com";
converter.ConvertUrlToFile(htmlPageURL, "UrlToFile.pdf");

Imports EvoPdf

' create the converter object in your code where you want to run conversion
Private converter As New HtmlToPdfConverter()

' convert the HTML string to a PDF file
converter.ConvertHtmlToFile("<b>Hello World</b> from EVO PDF !", Nothing, "HtmlToFile.pdf")

' convert HTML pages from URL to a PDF file
Dim htmlPageURL As String = "http://www.evopdf.com"
converter.ConvertUrlToFile(htmlPageURL, "UrlToFile.pdf")

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")

PdfSecurityOptions securityOptions = new PdfSecurityOptions();

securityOptions.CanAssembleDocument = canAssembleDocument;
securityOptions.CanCopyContent = canCopyContent;
securityOptions.CanEditAnnotations = canEditAnnotations;
securityOptions.CanEditContent = canEditContent;
securityOptions.CanFillFormFields = canFillFormFields;
securityOptions.CanPrint = canPrint;
securityOptions.KeySize = keySize;
securityOptions.UserPassword = userPassword;
securityOptions.OwnerPassword = ownerPassword;

PdfSecurityManager securityManager = new PdfSecurityManager(securityOptions);

if (removeSecurity)
    securityManager.SaveUnSecuredPdfToFile(srcPdfFile, outFile, removeSecurityPswd);
else
    securityManager.SaveSecuredPdfToFile(srcPdfFile, outFile);

Dim securityOptions As New PdfSecurityOptions()

securityOptions.CanAssembleDocument = canAssembleDocument
securityOptions.CanCopyContent = canCopyContent
securityOptions.CanEditAnnotations = canEditAnnotations
securityOptions.CanEditContent = canEditContent
securityOptions.CanFillFormFields = canFillFormFields
securityOptions.CanPrint = canPrint
securityOptions.KeySize = keySize
securityOptions.UserPassword = userPassword
securityOptions.OwnerPassword = ownerPassword

Dim securityManager As New PdfSecurityManager(securityOptions)

If removeSecurity Then
	securityManager.SaveUnSecuredPdfToFile(srcPdfFile, outFile, removeSecurityPswd)
Else
	securityManager.SaveSecuredPdfToFile(srcPdfFile, outFile)
End If

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 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 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 PdfSignature object
Private sig = New PdfSignature(cert)

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

protected void convertToPdfButton_Click(object sender, EventArgs e)
{
    // Create a HTML to PDF converter object with default settings
    HtmlToPdfConverter htmlToPdfConverter = new HtmlToPdfConverter();

    // Set license key received after purchase to use the converter in licensed mode
    // Leave it not set to use the converter in demo mode
    htmlToPdfConverter.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c=";

    Document pdfDocument = null;
    try
    {
        string htmlWithDigitalSignatureMarker = htmlStringTextBox.Text;
        string baseUrl = baseUrlTextBox.Text;

        // Convert a HTML string with a marker for digital signature to a PDF document object
        pdfDocument = htmlToPdfConverter.ConvertHtmlToPdfDocumentObject(htmlWithDigitalSignatureMarker, baseUrl);

        // Make the HTML element with 'digital_signature_element' mapping ID a link to digital signature properties
        HtmlElementMapping digitalSignatureMapping = htmlToPdfConverter.HtmlElementsMappingOptions.HtmlElementsMappingResult.GetElementByMappingId("digital_signature_element");
        if (digitalSignatureMapping != null)
        {
            PdfPage digitalSignaturePage = digitalSignatureMapping.PdfRectangles[0].PdfPage;
            RectangleF digitalSignatureRectangle = digitalSignatureMapping.PdfRectangles[0].Rectangle;

            string certificateFilePath = Server.MapPath("~/DemoAppFiles/Input/Certificates/evopdf.pfx");

            // Get the certificate from password protected PFX file
            DigitalCertificatesCollection certificates = DigitalCertificatesStore.GetCertificates(certificateFilePath, "evopdf");
            DigitalCertificate certificate = certificates[0];

            // Create the digital signature
            DigitalSignatureElement signature = new DigitalSignatureElement(digitalSignatureRectangle, certificate);
            signature.Reason = "Protect the document from unwanted changes";
            signature.ContactInfo = "The contact email is support@evopdf.com";  
            signature.Location = "Development server";
            digitalSignaturePage.AddElement(signature);
        }

        // Save the PDF document in a memory buffer
        byte[] outPdfBuffer = pdfDocument.Save();

        // Send the PDF as response to browser

        // Set response content type
        Response.AddHeader("Content-Type", "application/pdf");

        // Instruct the browser to open the PDF file as an attachment or inline
        Response.AddHeader("Content-Disposition", String.Format("attachment; filename=Digital_Signatures.pdf; size={0}", outPdfBuffer.Length.ToString()));

        // Write the PDF document buffer to HTTP response
        Response.BinaryWrite(outPdfBuffer);

        // End the HTTP response and stop the current page processing
        Response.End();
    }
    finally
    {
        // Close the PDF document
        if (pdfDocument != null)
            pdfDocument.Close();
    }
}

Protected Sub convertToPdfButton_Click(ByVal sender As Object, ByVal e As EventArgs)
	' Create a HTML to PDF converter object with default settings
	Dim htmlToPdfConverter As New HtmlToPdfConverter()

	' Set license key received after purchase to use the converter in licensed mode
	' Leave it not set to use the converter in demo mode
	htmlToPdfConverter.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c="

	Dim pdfDocument As Document = Nothing
	Try
		Dim htmlWithDigitalSignatureMarker As String = htmlStringTextBox.Text
		Dim baseUrl As String = baseUrlTextBox.Text

		' Convert a HTML string with a marker for digital signature to a PDF document object
		pdfDocument = htmlToPdfConverter.ConvertHtmlToPdfDocumentObject(htmlWithDigitalSignatureMarker, baseUrl)

		' Make the HTML element with 'digital_signature_element' mapping ID a link to digital signature properties
		Dim digitalSignatureMapping As HtmlElementMapping = htmlToPdfConverter.HtmlElementsMappingOptions.HtmlElementsMappingResult.GetElementByMappingId("digital_signature_element")
		If digitalSignatureMapping IsNot Nothing Then
			Dim digitalSignaturePage As PdfPage = digitalSignatureMapping.PdfRectangles(0).PdfPage
			Dim digitalSignatureRectangle As RectangleF = digitalSignatureMapping.PdfRectangles(0).Rectangle

			Dim certificateFilePath As String = Server.MapPath("~/DemoAppFiles/Input/Certificates/evopdf.pfx")

			' Get the certificate from password protected PFX file
			Dim certificates As DigitalCertificatesCollection = DigitalCertificatesStore.GetCertificates(certificateFilePath, "evopdf")
			Dim certificate As DigitalCertificate = certificates(0)

			' Create the digital signature
			Dim signature As New DigitalSignatureElement(digitalSignatureRectangle, certificate)
			signature.Reason = "Protect the document from unwanted changes"
			signature.ContactInfo = "The contact email is support@evopdf.com"
			signature.Location = "Development server"
			digitalSignaturePage.AddElement(signature)
		End If

		' Save the PDF document in a memory buffer
		Dim outPdfBuffer() As Byte = pdfDocument.Save()

		' Send the PDF as response to browser

		' Set response content type
		Response.AddHeader("Content-Type", "application/pdf")

		' Instruct the browser to open the PDF file as an attachment or inline
		Response.AddHeader("Content-Disposition", String.Format("attachment; filename=Digital_Signatures.pdf; size={0}", outPdfBuffer.Length.ToString()))

		' Write the PDF document buffer to HTTP response
		Response.BinaryWrite(outPdfBuffer)

		' End the HTTP response and stop the current page processing
		Response.End()
	Finally
		' Close the PDF document
		If pdfDocument IsNot Nothing Then
			pdfDocument.Close()
		End If
	End Try
End Sub

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")

protected void convertToPdfButton_Click(object sender, EventArgs e)
{
    // Create a HTML to PDF converter object with default settings
    HtmlToPdfConverter htmlToPdfConverter = new HtmlToPdfConverter();

    htmlToPdfConverter.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c=";

    Document pdfDocument = null;
    try
    {
        // Convert a HTML page to a PDF document object
        pdfDocument = htmlToPdfConverter.ConvertUrlToPdfDocumentObject(urlTextBox.Text);

        // Get the stamp width and height
        float stampWidth = float.Parse(stampWidthTextBox.Text);
        float stampHeight = float.Parse(stampHeightTextBox.Text);

        // Center the stamp at the top of PDF page
        float stampXLocation = (pdfDocument.Pages[0].ClientRectangle.Width - stampWidth) / 2;
        float stampYLocation = 0;

        RectangleF stampRectangle = new RectangleF(stampXLocation, stampYLocation, stampWidth, stampHeight);

        // Create the stamp template to be repeated in each PDF page
        Template stampTemplate = pdfDocument.AddTemplate(stampRectangle);

        // Create the HTML element to add in stamp template
        HtmlToPdfElement stampHtmlElement = new HtmlToPdfElement(htmlStringTextBox.Text, baseUrlTextBox.Text);

        // Set the HTML viewer width for the HTML added in stamp
        stampHtmlElement.HtmlViewerWidth = 600;
        // Fit the HTML content in stamp template
        stampHtmlElement.FitWidth = true;
        stampHtmlElement.FitHeight = true;

        // Add HTML to stamp template
        stampTemplate.AddElement(stampHtmlElement);

        // Save the PDF document in a memory buffer
        byte[] outPdfBuffer = pdfDocument.Save();

        // Send the PDF as response to browser
        // Set response content type
        Response.AddHeader("Content-Type", "application/pdf");

        // Instruct the browser to open the PDF file as an attachment or inline
        Response.AddHeader("Content-Disposition", String.Format("attachment; filename=Watermarks_and_Stamps.pdf; size={0}", outPdfBuffer.Length.ToString()));

        // Write the PDF document buffer to HTTP response
        Response.BinaryWrite(outPdfBuffer);

        // End the HTTP response and stop the current page processing
        Response.End();
    }
    finally
    {
        // Close the PDF document
        if (pdfDocument != null)
            pdfDocument.Close();
    }
}

Protected Sub convertToPdfButton_Click(ByVal sender As Object, ByVal e As EventArgs)
	' Create a HTML to PDF converter object with default settings
	Dim htmlToPdfConverter As New HtmlToPdfConverter()

	htmlToPdfConverter.LicenseKey = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c="

	Dim pdfDocument As Document = Nothing
	Try
		' Convert a HTML page to a PDF document object
		pdfDocument = htmlToPdfConverter.ConvertUrlToPdfDocumentObject(urlTextBox.Text)

		' Get the stamp width and height
		Dim stampWidth As Single = Single.Parse(stampWidthTextBox.Text)
		Dim stampHeight As Single = Single.Parse(stampHeightTextBox.Text)

		' Center the stamp at the top of PDF page
		Dim stampXLocation As Single = (pdfDocument.Pages(0).ClientRectangle.Width - stampWidth) / 2
		Dim stampYLocation As Single = 0

		Dim stampRectangle As New RectangleF(stampXLocation, stampYLocation, stampWidth, stampHeight)

		' Create the stamp template to be repeated in each PDF page
		Dim stampTemplate As Template = pdfDocument.AddTemplate(stampRectangle)

		' Create the HTML element to add in stamp template
		Dim stampHtmlElement As New HtmlToPdfElement(htmlStringTextBox.Text, baseUrlTextBox.Text)

		' Set the HTML viewer width for the HTML added in stamp
		stampHtmlElement.HtmlViewerWidth = 600
		' Fit the HTML content in stamp template
		stampHtmlElement.FitWidth = True
		stampHtmlElement.FitHeight = True

		' Add HTML to stamp template
		stampTemplate.AddElement(stampHtmlElement)

		' Save the PDF document in a memory buffer
		Dim outPdfBuffer() As Byte = pdfDocument.Save()

		' Send the PDF as response to browser
		' Set response content type
		Response.AddHeader("Content-Type", "application/pdf")

		' Instruct the browser to open the PDF file as an attachment or inline
		Response.AddHeader("Content-Disposition", String.Format("attachment; filename=Watermarks_and_Stamps.pdf; size={0}", outPdfBuffer.Length.ToString()))

		' Write the PDF document buffer to HTTP response
		Response.BinaryWrite(outPdfBuffer)

		' End the HTTP response and stop the current page processing
		Response.End()
	Finally
		' Close the PDF document
		If pdfDocument IsNot Nothing Then
			pdfDocument.Close()
		End If
	End Try
End Sub

using IronPdf;
using IronPdf.Editing;

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");

Imports IronPdf
Imports IronPdf.Editing

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")

using IronPdf;
using IronPdf.Editing;
using System;

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

// 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
Imports System

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

' Create image stamper
Private 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 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")