如何在C# .NET中将JPG转换为PDF

using IronPdf;

// Convert a single JPG image to PDF
PdfDocument pdf = ImageToPdfConverter.ImageToPdf("inputImage.jpg");

// Add metadata for compliance tracking
pdf.MetaData.Author = "Enterprise System";
pdf.MetaData.CreationDate = DateTime.Now;
pdf.MetaData.Keywords = "JPG-Conversion,Compliance-Ready";

// Apply security settings for sensitive documents
pdf.SecuritySettings.AllowUserPrinting = true;
pdf.SecuritySettings.AllowUserEditing = false;
pdf.SecuritySettings.AllowUserCopyPasteContent = false;

// Save the converted PDF to disk
pdf.SaveAs("output.pdf");

Imports IronPdf

' Convert a single JPG image to PDF
Dim pdf As PdfDocument = ImageToPdfConverter.ImageToPdf("inputImage.jpg")

' Add metadata for compliance tracking
pdf.MetaData.Author = "Enterprise System"
pdf.MetaData.CreationDate = DateTime.Now
pdf.MetaData.Keywords = "JPG-Conversion,Compliance-Ready"

' Apply security settings for sensitive documents
pdf.SecuritySettings.AllowUserPrinting = True
pdf.SecuritySettings.AllowUserEditing = False
pdf.SecuritySettings.AllowUserCopyPasteContent = False

' Save the converted PDF to disk
pdf.SaveAs("output.pdf")

using IronPdf;

// Define multiple JPG images to convert
string[] jpgImages = { "page1.jpg", "page2.jpeg", "page3.jpg" };

// Validate all files exist before processing
foreach (var imagePath in jpgImages)
{
    if (!File.Exists(imagePath))
    {
        throw new FileNotFoundException($"Required image not found: {imagePath}");
    }
}

// Convert all images into a single PDF document
PdfDocument pdf = ImageToPdfConverter.ImageToPdf(jpgImages);

// Add headers for document identification
pdf.AddHtmlHeaders(new HtmlHeaderFooter()
{
    HtmlFragment = "<div style='text-align:center'>Confidential - {date}</div>",
    Height = 25
});

// Apply compression for optimal file size
pdf.CompressImages(70);

// Save the combined PDF
pdf.SaveAs("combined-document.pdf");

Imports IronPdf

' Define multiple JPG images to convert
Dim jpgImages As String() = {"page1.jpg", "page2.jpeg", "page3.jpg"}

' Validate all files exist before processing
For Each imagePath In jpgImages
    If Not File.Exists(imagePath) Then
        Throw New FileNotFoundException($"Required image not found: {imagePath}")
    End If
Next

' Convert all images into a single PDF document
Dim pdf As PdfDocument = ImageToPdfConverter.ImageToPdf(jpgImages)

' Add headers for document identification
pdf.AddHtmlHeaders(New HtmlHeaderFooter() With {
    .HtmlFragment = "<div style='text-align:center'>Confidential - {date}</div>",
    .Height = 25
})

' Apply compression for optimal file size
pdf.CompressImages(70)

' Save the combined PDF
pdf.SaveAs("combined-document.pdf")

using IronPdf;

// Convert any supported image format using the same API
string imagePath = "document.tiff";

PdfDocument pdf = ImageToPdfConverter.ImageToPdf(imagePath);

// Apply enterprise metadata standards
pdf.MetaData.Producer = "Enterprise Document System v2.0";

pdf.SaveAs("output.pdf");

Imports IronPdf

' Convert any supported image format using the same API
Dim imagePath As String = "document.tiff"

Dim pdf As PdfDocument = ImageToPdfConverter.ImageToPdf(imagePath)

' Apply enterprise metadata standards
pdf.MetaData.Producer = "Enterprise Document System v2.0"

pdf.SaveAs("output.pdf")

using IronPdf;

// Convert image maintaining original quality
PdfDocument pdf = ImageToPdfConverter.ImageToPdf("high-res-scan.jpg");

// Apply linearization for fast web viewing (archival quality)
pdf.SaveAsLinearized("output-linearized.pdf");

// Alternatively, apply controlled compression when file size matters
pdf.CompressImages(90); // 90 = near-lossless
pdf.SaveAs("output-compressed.pdf");

Imports IronPdf

' Convert image maintaining original quality
Dim pdf As PdfDocument = ImageToPdfConverter.ImageToPdf("high-res-scan.jpg")

' Apply linearization for fast web viewing (archival quality)
pdf.SaveAsLinearized("output-linearized.pdf")

' Alternatively, apply controlled compression when file size matters
pdf.CompressImages(90) ' 90 = near-lossless
pdf.SaveAs("output-compressed.pdf")

using IronPdf;

// Create renderer with custom page settings
ChromePdfRenderer renderer = new ChromePdfRenderer();

// Configure for standard business documents
renderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4;
renderer.RenderingOptions.PaperOrientation = IronPdf.Rendering.PdfPaperOrientation.Portrait;
renderer.RenderingOptions.MarginTop = 25;
renderer.RenderingOptions.MarginBottom = 25;
renderer.RenderingOptions.MarginLeft = 20;
renderer.RenderingOptions.MarginRight = 20;

// Apply a corporate logo header
renderer.RenderingOptions.HtmlHeader = new HtmlHeaderFooter()
{
    HtmlFragment = "<img src='corporate-logo.png' style='height:30px'/>",
    Height = 40
};

// Wrap the image in HTML to control layout precisely
string imageHtml = @"
    <html>
    <body style='margin:0'>
        <img src='wide-photo.jpg' style='width:100%; max-width:100%'/>
    </body>
    </html>";

PdfDocument pdf = renderer.RenderHtmlAsPdf(imageHtml);

// Add page numbers for multi-page documents
pdf.AddTextFooters("{page} of {total-pages}", IronPdf.Font.FontFamily.Arial, 10);

pdf.SaveAs("formatted-document.pdf");

Imports IronPdf

' Create renderer with custom page settings
Dim renderer As New ChromePdfRenderer()

' Configure for standard business documents
renderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4
renderer.RenderingOptions.PaperOrientation = IronPdf.Rendering.PdfPaperOrientation.Portrait
renderer.RenderingOptions.MarginTop = 25
renderer.RenderingOptions.MarginBottom = 25
renderer.RenderingOptions.MarginLeft = 20
renderer.RenderingOptions.MarginRight = 20

' Apply a corporate logo header
renderer.RenderingOptions.HtmlHeader = New HtmlHeaderFooter() With {
    .HtmlFragment = "<img src='corporate-logo.png' style='height:30px'/>",
    .Height = 40
}

' Wrap the image in HTML to control layout precisely
Dim imageHtml As String = "
    <html>
    <body style='margin:0'>
        <img src='wide-photo.jpg' style='width:100%; max-width:100%'/>
    </body>
    </html>"

Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf(imageHtml)

' Add page numbers for multi-page documents
pdf.AddTextFooters("{page} of {total-pages}", IronPdf.Font.FontFamily.Arial, 10)

pdf.SaveAs("formatted-document.pdf")

using IronPdf;

// Convert JPG to PDF
PdfDocument pdf = ImageToPdfConverter.ImageToPdf("invoice-scan.jpg");

// Add a text watermark for draft documents
pdf.ApplyWatermark("<h1 style='color:red;opacity:0.3'>DRAFT</h1>", rotation: 45, opacity: 80);

// Add a footer with the page number and date
pdf.AddHtmlFooters(new HtmlHeaderFooter()
{
    HtmlFragment = "<div style='text-align:right;font-size:10px'>Page {page} of {total-pages} -- {date}</div>",
    Height = 20
});

pdf.SaveAs("watermarked-invoice.pdf");

Imports IronPdf

' Convert JPG to PDF
Dim pdf As PdfDocument = ImageToPdfConverter.ImageToPdf("invoice-scan.jpg")

' Add a text watermark for draft documents
pdf.ApplyWatermark("<h1 style='color:red;opacity:0.3'>DRAFT</h1>", rotation:=45, opacity:=80)

' Add a footer with the page number and date
pdf.AddHtmlFooters(New HtmlHeaderFooter() With {
    .HtmlFragment = "<div style='text-align:right;font-size:10px'>Page {page} of {total-pages} -- {date}</div>",
    .Height = 20
})

pdf.SaveAs("watermarked-invoice.pdf")

using IronPdf;

// Convert the image
PdfDocument pdf = ImageToPdfConverter.ImageToPdf("medical-scan.jpg");

// Set an owner password (admin) and a user password (read-only access)
pdf.SecuritySettings.OwnerPassword = "admin-secret";
pdf.SecuritySettings.UserPassword = "readonly-access";

// Restrict editing and copying, but allow printing
pdf.SecuritySettings.AllowUserPrinting = true;
pdf.SecuritySettings.AllowUserEditing = false;
pdf.SecuritySettings.AllowUserCopyPasteContent = false;
pdf.SecuritySettings.AllowUserAnnotations = false;

// Encrypt with AES-256
pdf.SecuritySettings.EncryptionLevel = PdfEncryptionLevel.AES_256;

pdf.SaveAs("secured-medical-scan.pdf");

Imports IronPdf

' Convert the image
Dim pdf As PdfDocument = ImageToPdfConverter.ImageToPdf("medical-scan.jpg")

' Set an owner password (admin) and a user password (read-only access)
pdf.SecuritySettings.OwnerPassword = "admin-secret"
pdf.SecuritySettings.UserPassword = "readonly-access"

' Restrict editing and copying, but allow printing
pdf.SecuritySettings.AllowUserPrinting = True
pdf.SecuritySettings.AllowUserEditing = False
pdf.SecuritySettings.AllowUserCopyPasteContent = False
pdf.SecuritySettings.AllowUserAnnotations = False

' Encrypt with AES-256
pdf.SecuritySettings.EncryptionLevel = PdfEncryptionLevel.AES_256

pdf.SaveAs("secured-medical-scan.pdf")