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如何在 C&num 中编辑 PDF；

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介绍

Iron Software在IronPDF库中简化了许多不同的PDF编辑功能，使方法易于阅读和理解。 无论是添加签名、添加HTML页脚、盖章水印还是添加注释。 IronPDF是为您提供的工具，它允许您拥有可读的代码、程序化PDF生成、简便的调试和轻松部署到任何支持的环境或平台。

IronPDF在编辑PDF时具有无数的功能。 在这篇教程文章中，我们将通过一些代码示例和解释来讲解其中的一些主要内容。

通过本文，您将了解如何使用IronPDF在C#中编辑您的PDF文件。

目录

编辑文档结构

操作页面

使用IronPDF在特定索引处添加PDF、按范围或逐个复制页面，以及从任何PDF中删除页面都非常简单，IronPDF会在幕后处理一切。

添加页面

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-1.cs
var pdf = new PdfDocument("report.pdf");
var renderer = new ChromePdfRenderer();
var coverPagePdf = renderer.RenderHtmlAsPdf("<h1>Cover Page</h1><hr>");
pdf.PrependPdf(coverPagePdf);
pdf.SaveAs("report_with_cover.pdf");
Dim pdf = New PdfDocument("report.pdf")
Dim renderer = New ChromePdfRenderer()
Dim coverPagePdf = renderer.RenderHtmlAsPdf("<h1>Cover Page</h1><hr>")
pdf.PrependPdf(coverPagePdf)
pdf.SaveAs("report_with_cover.pdf")
VB   C#

复制页

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-2.cs
var pdf = new PdfDocument("report.pdf");
// Copy pages 5 to 7 and save them as a new document.
pdf.CopyPages(4, 6).SaveAs("report_highlight.pdf");
Dim pdf = New PdfDocument("report.pdf")
' Copy pages 5 to 7 and save them as a new document.
pdf.CopyPages(4, 6).SaveAs("report_highlight.pdf")
VB   C#

删除页面

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-3.cs
var pdf = new PdfDocument("report.pdf");

// Remove the last page from the PDF and save again
pdf.RemovePage(pdf.PageCount - 1);
pdf.SaveAs("report_minus_one_page.pdf");
Dim pdf = New PdfDocument("report.pdf")

' Remove the last page from the PDF and save again
pdf.RemovePage(pdf.PageCount - 1)
pdf.SaveAs("report_minus_one_page.pdf")
VB   C#

合并和拆分 PDF 文件

使用IronPDF直观的API，可以轻松地将多个PDF合并成一个PDF或拆分现有的PDF。

将多个现有 PDF 文件合并为一个 PDF 文档

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-4.cs
var pdfs = new List<PdfDocument>
{
    PdfDocument.FromFile("A.pdf"),
    PdfDocument.FromFile("B.pdf"),
    PdfDocument.FromFile("C.pdf")
};

PdfDocument mergedPdf = PdfDocument.Merge(pdfs);
mergedPdf.SaveAs("merged.pdf");

foreach (var pdf in pdfs)
{
    pdf.Dispose();
}
Dim pdfs = New List(Of PdfDocument) From {PdfDocument.FromFile("A.pdf"), PdfDocument.FromFile("B.pdf"), PdfDocument.FromFile("C.pdf")}

Dim mergedPdf As PdfDocument = PdfDocument.Merge(pdfs)
mergedPdf.SaveAs("merged.pdf")

For Each pdf In pdfs
	pdf.Dispose()
Next pdf
VB   C#

要查看代码示例页面上的两个或更多 PDF，请访问这里.

分割 PDF 文件并提取页面

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-5.cs
var pdf = new PdfDocument("sample.pdf");

// Take the first page
var pdf_page1 = pdf.CopyPage(0);
pdf_page1.SaveAs("Split1.pdf");

// Take the pages 2 & 3
var pdf_page2_3 = pdf.CopyPages(1, 2);
pdf_page2_3.SaveAs("Spli2t.pdf");
Dim pdf = New PdfDocument("sample.pdf")

' Take the first page
Dim pdf_page1 = pdf.CopyPage(0)
pdf_page1.SaveAs("Split1.pdf")

' Take the pages 2 & 3
Dim pdf_page2_3 = pdf.CopyPages(1, 2)
pdf_page2_3.SaveAs("Spli2t.pdf")
VB   C#

要查看代码示例页面中的拆分和提取页面，请访问这里.

编辑文档属性

添加和使用 PDF 元数据

您可以轻松使用IronPDF来浏览和编辑PDF元数据：

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-6.cs
// 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;

// Edit file security settings
// The following code makes a PDF read only and will disallow copy & paste and printing
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.SecuritySettings.OwnerPassword = "top-secret"; // password to edit the pdf
pdf.SecuritySettings.UserPassword = "shareable";  // password to open the pdf
pdf.SaveAs("secured.pdf");
Imports System

' Open an Encrypted File, alternatively create a new PDF from Html
Dim 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
' The following code makes a PDF read only and will disallow copy & paste and printing
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.SecuritySettings.OwnerPassword = "top-secret" ' password to edit the pdf
pdf.SecuritySettings.UserPassword = "shareable" ' password to open the pdf
pdf.SaveAs("secured.pdf")
VB   C#

数字签名

IronPDF 支持使用 .pfx 和 .p12 X509Certificate2 数字证书对新的或现有的 PDF 文件进行数字签名。

一旦PDF文件被签名，未经证书验证便无法修改。 这确保了保真度。

要使用 Adobe Reader 免费生成签名证书，请阅读 https://helpx.adobe.com/acrobat/using/digital-ids.html

除了加密签名，还可以使用手写签名图像或公司印章图像通过IronPDF进行签名。

在一行代码中对现有的PDF文件进行加密签名。!

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-7.cs
using IronPdf;
using IronPdf.Signing;


new IronPdf.Signing.PdfSignature("Iron.p12", "123456").SignPdfFile("any.pdf");
Imports IronPdf
Imports IronPdf.Signing


Call (New IronPdf.Signing.PdfSignature("Iron.p12", "123456")).SignPdfFile("any.pdf")
VB   C#

控制能力更强的高级示例：

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-8.cs
using IronPdf;

// Step 1. Create a PDF
var renderer = new ChromePdfRenderer();
var doc = renderer.RenderHtmlAsPdf("<h1>Testing 2048 bit digital security</h1>");

// Step 2. Create a Signature.
// You may create a .pfx or .p12 PDF signing certificate using Adobe Acrobat Reader.
// Read: https://helpx.adobe.com/acrobat/using/digital-ids.html
var signature = new IronPdf.Signing.PdfSignature("Iron.pfx", "123456")
{
    // Step 3. Optional signing options and a handwritten signature graphic
    SigningContact = "support@ironsoftware.com",
    SigningLocation = "Chicago, USA",
    SigningReason = "To show how to sign a PDF"
};

//Step 4. Sign the PDF with the PdfSignature. Multiple signing certificates may be used
doc.Sign(signature);

//Step 5. The PDF is not signed until saved to file, steam or byte array.
doc.SaveAs("signed.pdf");
Imports IronPdf

' Step 1. Create a PDF
Private renderer = New ChromePdfRenderer()
Private doc = renderer.RenderHtmlAsPdf("<h1>Testing 2048 bit digital security</h1>")

' Step 2. Create a Signature.
' You may create a .pfx or .p12 PDF signing certificate using Adobe Acrobat Reader.
' Read: https://helpx.adobe.com/acrobat/using/digital-ids.html
Private signature = New IronPdf.Signing.PdfSignature("Iron.pfx", "123456") With {
	.SigningContact = "support@ironsoftware.com",
	.SigningLocation = "Chicago, USA",
	.SigningReason = "To show how to sign a PDF"
}

'Step 4. Sign the PDF with the PdfSignature. Multiple signing certificates may be used
doc.Sign(signature)

'Step 5. The PDF is not signed until saved to file, steam or byte array.
doc.SaveAs("signed.pdf")
VB   C#

PDF 附件

IronPDF 完全支持向您的 PDF 文档添加和删除附件。

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-9.cs
var Renderer = new ChromePdfRenderer();
var myPdf = Renderer.RenderHtmlFileAsPdf("my-content.html");

// Here we can add an attachment with a name and byte[]
var attachment1 = myPdf.Attachments.AddAttachment("attachment_1", example_attachment);

// And here is an example of removing an attachment
myPdf.Attachments.RemoveAttachment(attachment1);

myPdf.SaveAs("my-content.pdf");
Dim Renderer = New ChromePdfRenderer()
Dim myPdf = Renderer.RenderHtmlFileAsPdf("my-content.html")

' Here we can add an attachment with a name and byte[]
Dim attachment1 = myPdf.Attachments.AddAttachment("attachment_1", example_attachment)

' And here is an example of removing an attachment
myPdf.Attachments.RemoveAttachment(attachment1)

myPdf.SaveAs("my-content.pdf")
VB   C#

压缩PDF

IronPDF支持PDF压缩。 减小PdfDocument内嵌图像的大小是减小PDF文件大小的一种方法。 在IronPDF中，我们可以调用CompressImages方法。

调整JPEG大小的方式是，100% 质量几乎没有损失，而1% 是非常低的输出图像质量。 一般来说，90%及以上被认为是高质量，80%-90%被认为是中等质量，70%-80%被认为是低质量。 将比例降低到70%以下将会产生低质量的图片，但这样做可以显著减少PdfDocument的总文件大小。

请尝试使用不同的值，以感受质量与文件大小之间的平衡范围，以找到符合您需求的最佳平衡。 显而易见的质量下降最终取决于输入的图像类型，有些图像的清晰度可能会比其他图像更明显地降低。

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-10.cs
var pdf = new PdfDocument("document.pdf");

// Quality parameter can be 1-100, where 100 is 100% of original quality
pdf.CompressImages(60);
pdf.SaveAs("document_compressed.pdf");
Dim pdf = New PdfDocument("document.pdf")

' Quality parameter can be 1-100, where 100 is 100% of original quality
pdf.CompressImages(60)
pdf.SaveAs("document_compressed.pdf")
VB   C#

PDF文档中有第二个可选参数，可以根据图像在PDF中的可见大小调整图像分辨率。 请注意，这可能会导致某些图像配置出现失真：

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-11.cs
var pdf = new PdfDocument("document.pdf");

pdf.CompressImages(90, true);
pdf.SaveAs("document_scaled_compressed.pdf");
Dim pdf = New PdfDocument("document.pdf")

pdf.CompressImages(90, True)
pdf.SaveAs("document_scaled_compressed.pdf")
VB   C#

编辑 PDF 内容

添加页眉和页脚

您可以轻松地为您的PDF添加页眉和页脚。 IronPDF有两种不同类型的“HeaderFooters”，分别是TextHeaderFooter和HtmlHeaderFooter。 TextHeaderFooter可更好地处理仅包含文本的页眉和页脚，并且可能需要使用合并字段，例如"{页码}的{总页数}. HtmlHeaderFooter 是一个高级的页眉和页脚，可以与其中的任何 HTML 配合使用，并且格式整洁。

HTML 页眉和页脚

HTML头部和尾部将使用您的HTML的渲染版本作为PDF文档的头部或尾部，以实现像素完美的布局。

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-12.cs
var renderer = new ChromePdfRenderer();

// Build a footer using html to style the text
// mergeable fields are:
// {page} {total-pages} {url} {date} {time} {html-title} & {pdf-title}
renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter()
{
    MaxHeight = 15, //millimeters
    HtmlFragment = "<center><i>{page} of {total-pages}<i></center>",
    DrawDividerLine = true
};

// Build a header using an image asset
// Note the use of BaseUrl to set a relative path to the assets
renderer.RenderingOptions.HtmlHeader = new HtmlHeaderFooter()
{
    MaxHeight = 20, //millimeters
    HtmlFragment = "<img src='logo.png'>",
    BaseUrl = new System.Uri(@"C:\assets\images").AbsoluteUri
};
Dim renderer = New ChromePdfRenderer()

' Build a footer using html to style the text
' mergeable fields are:
' {page} {total-pages} {url} {date} {time} {html-title} & {pdf-title}
renderer.RenderingOptions.HtmlFooter = New HtmlHeaderFooter() With {
	.MaxHeight = 15,
	.HtmlFragment = "<center><i>{page} of {total-pages}<i></center>",
	.DrawDividerLine = True
}

' Build a header using an image asset
' Note the use of BaseUrl to set a relative path to the assets
renderer.RenderingOptions.HtmlHeader = New HtmlHeaderFooter() With {
	.MaxHeight = 20,
	.HtmlFragment = "<img src='logo.png'>",
	.BaseUrl = (New System.Uri("C:\assets\images")).AbsoluteUri
}
VB   C#

有关包含多个使用案例的完整深入示例，请参阅以下教程：这里.

文本页眉和页脚

基本的页眉和页脚是 TextHeaderFooter，请参见下面的示例。

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-13.cs
var renderer = new ChromePdfRenderer
{
    RenderingOptions =
    {
        FirstPageNumber = 1, // use 2 if a cover-page  will be appended

        // Add a header to every page easily:
        TextHeader =
        {
            DrawDividerLine = true,
            CenterText = "{url}",
            Font = IronSoftware.Drawing.FontTypes.Helvetica,
            FontSize = 12
        },

        // Add a footer too:
        TextFooter =
        {
            DrawDividerLine = true,
            Font = IronSoftware.Drawing.FontTypes.Arial,
            FontSize = 10,
            LeftText = "{date} {time}",
            RightText = "{page} of {total-pages}"
        }
    }
};
Dim renderer = New ChromePdfRenderer With {
	.RenderingOptions = {
		FirstPageNumber = 1, TextHeader = {
			DrawDividerLine = True,
			CenterText = "{url}",
			Font = IronSoftware.Drawing.FontTypes.Helvetica,
			FontSize = 12
		},
		TextFooter = {
			DrawDividerLine = True,
			Font = IronSoftware.Drawing.FontTypes.Arial,
			FontSize = 10,
			LeftText = "{date} {time}",
			RightText = "{page} of {total-pages}"
		}
	}
}
VB   C#

我们还有以下合并字段，这些字段的值将在渲染时被替换： .{页码}, {总页数}, {网址}, {日期}, {时间}, {html-title}, {pdf标题}

查找和替换 PDF 中的文本

在您的PDF中创建占位符并以编程方式替换它们，或使用我们的 ReplaceTextOnPage 方法替换所有文本短语的实例。

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-14.cs
// Using an existing PDF
var pdf = PdfDocument.FromFile("sample.pdf");

// Parameters
int pageIndex = 1;
string oldText = ".NET 6"; // Old text to remove
string newText = ".NET 7"; // New text to add

// Replace Text on Page
pdf.ReplaceTextOnPage(pageIndex, oldText, newText);

// Placeholder Template Example
pdf.ReplaceTextOnPage(pageIndex, "[DATE]", "01/01/2000");

// Save your new PDF
pdf.SaveAs("new_sample.pdf");
' Using an existing PDF
Dim pdf = PdfDocument.FromFile("sample.pdf")

' Parameters
Dim pageIndex As Integer = 1
Dim oldText As String = ".NET 6" ' Old text to remove
Dim newText As String = ".NET 7" ' New text to add

' Replace Text on Page
pdf.ReplaceTextOnPage(pageIndex, oldText, newText)

' Placeholder Template Example
pdf.ReplaceTextOnPage(pageIndex, "[DATE]", "01/01/2000")

' Save your new PDF
pdf.SaveAs("new_sample.pdf")
VB   C#

要查看代码示例页面上的查找和替换文本示例，请访问这里

大纲和书签

PDF中的大纲或“书签”提供了一种导航到关键页面的方式。 在Adobe Acrobat Reader中，这些书签(可嵌套)显示在应用程序左侧边栏中。 IronPDF将自动导入PDF文档中现有的书签，并允许添加、编辑和嵌套更多书签。

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-15.cs
// Create a new PDF or edit an existing document.
PdfDocument pdf = PdfDocument.FromFile("existing.pdf");

// Add bookmark
pdf.Bookmarks.AddBookMarkAtEnd("Author's Note", 2);
pdf.Bookmarks.AddBookMarkAtEnd("Table of Contents", 3);

// Store new bookmark in a variable to add nested bookmarks to
var summaryBookmark = pdf.Bookmarks.AddBookMarkAtEnd("Summary", 17);

// Add a sub-bookmark within the summary
var conclusionBookmark = summaryBookmark.Children.AddBookMarkAtStart("Conclusion", 18);

// Add another bookmark to end of highest-level bookmark list
pdf.Bookmarks.AddBookMarkAtEnd("References", 20);

pdf.SaveAs("existing.pdf");
' Create a new PDF or edit an existing document.
Dim pdf As PdfDocument = PdfDocument.FromFile("existing.pdf")

' Add bookmark
pdf.Bookmarks.AddBookMarkAtEnd("Author's Note", 2)
pdf.Bookmarks.AddBookMarkAtEnd("Table of Contents", 3)

' Store new bookmark in a variable to add nested bookmarks to
Dim summaryBookmark = pdf.Bookmarks.AddBookMarkAtEnd("Summary", 17)

' Add a sub-bookmark within the summary
Dim conclusionBookmark = summaryBookmark.Children.AddBookMarkAtStart("Conclusion", 18)

' Add another bookmark to end of highest-level bookmark list
pdf.Bookmarks.AddBookMarkAtEnd("References", 20)

pdf.SaveAs("existing.pdf")
VB   C#

要查看代码示例页面上的大纲和书签示例，请访问这里.

添加和编辑注释

IronPDF拥有众多PDF注释的自定义选项。 请参考下面的示例，展示它的功能：

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-16.cs
// create a new PDF or load and edit an existing document.
var pdf = PdfDocument.FromFile("existing.pdf");

// Create a PDF annotation object
var textAnnotation = new IronPdf.Annotations.TextAnnotation(PageIndex: 0)
{
    Title = "This is the major title",
    Contents = "This is the long 'sticky note' comment content...",
    Subject = "This is a subtitle",
    Icon = IronPdf.Annotations.TextAnnotation.AnnotationIcon.Help,
    Opacity = 0.9,
    Printable = false,
    Hidden = false,
    OpenByDefault = true,
    ReadOnly = false,
    Rotatable = true,
};

// Add the annotation "sticky note" to a specific page and location within any new or existing PDF.
pdf.Annotations.Add(textAnnotation);

pdf.SaveAs("existing.pdf");
IRON VB CONVERTER ERROR developers@ironsoftware.com
VB   C#

PDF注释允许在PDF页面上添加类似“便利贴”的评论。 TextAnnotation 类允许以编程方式添加注释。 支持的高级文本注释功能包括调整大小、不透明度、图标和编辑。

添加背景和前景

使用IronPDF，我们可以轻松地合并2个PDF文件，将其中一个用作背景或前景：

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-17.cs
var renderer = new ChromePdfRenderer();
var pdf = renderer.RenderUrlAsPdf("https://www.nuget.org/packages/IronPdf");
pdf.AddBackgroundPdf(@"MyBackground.pdf");
pdf.AddForegroundOverlayPdfToPage(0, @"MyForeground.pdf", 0);
pdf.SaveAs(@"C:\Path\To\Complete.pdf");
Dim renderer = New ChromePdfRenderer()
Dim pdf = renderer.RenderUrlAsPdf("https://www.nuget.org/packages/IronPdf")
pdf.AddBackgroundPdf("MyBackground.pdf")
pdf.AddForegroundOverlayPdfToPage(0, "MyForeground.pdf", 0)
pdf.SaveAs("C:\Path\To\Complete.pdf")
VB   C#

烫印和水印

能够进行盖章和水印是任何PDF编辑器的基本功能。 IronPDF拥有一个出色的API，可用于创建多种印章，如图像印章和HTML印章。 这些都具有高度可定制的位置，使用对齐和偏移可以在这里看到：

烫印和水印

Stamper抽象类

Stamper 抽象类用作 IronPDF 所有印章方法的参数。

每个用例都有许多类：

Stamper 类属性

abstract class Stamper

└─── int : Opacity
└─── int : Rotation

└─── double : Scale

└─── Length : HorizontalOffset
└─── Length : VerticalOffset

└─── Length : MinWidth
└─── Length : MaxWidth

└─── Length : MinHeight
└─── Length : MaxHeight

└─── string : Hyperlink

└─── bool : IsStampBehindContent (default : false)

└─── HorizontalAlignment : HorizontalAlignment
│   │   Left
│   │   Center (default)
│   │   Right
│
└─── VerticalAlignment : VerticalAlignment
    │   Top
    │   Middle (default)
    │   Bottom

印章示例

我们在下面展示了Stamper的每一个子类以及相应的代码示例。

在 PDF 上印上文字

创建两种不同方式的文本印章并同时应用它们：

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-18.cs
var renderer = new ChromePdfRenderer();
var pdf = renderer.RenderHtmlAsPdf("<h1>Example HTML Document!</h1>");

TextStamper stamper1 = new TextStamper
{
    Text = "Hello World! Stamp One Here!",
    FontFamily = "Bungee Spice",
    UseGoogleFont = true,
    FontSize = 100,
    IsBold = true,
    IsItalic = true,
    VerticalAlignment = VerticalAlignment.Top
};

TextStamper stamper2 = new TextStamper()
{
    Text = "Hello World! Stamp Two Here!",
    FontFamily = "Bungee Spice",
    UseGoogleFont = true,
    FontSize = 30,
    VerticalAlignment = VerticalAlignment.Bottom
};

Stamper[] stampersToApply = { stamper1, stamper2 };
pdf.ApplyMultipleStamps(stampersToApply);
pdf.ApplyStamp(stamper2);
Dim renderer = New ChromePdfRenderer()
Dim pdf = renderer.RenderHtmlAsPdf("<h1>Example HTML Document!</h1>")

Dim stamper1 As New TextStamper With {
	.Text = "Hello World! Stamp One Here!",
	.FontFamily = "Bungee Spice",
	.UseGoogleFont = True,
	.FontSize = 100,
	.IsBold = True,
	.IsItalic = True,
	.VerticalAlignment = VerticalAlignment.Top
}

Dim stamper2 As New TextStamper() With {
	.Text = "Hello World! Stamp Two Here!",
	.FontFamily = "Bungee Spice",
	.UseGoogleFont = True,
	.FontSize = 30,
	.VerticalAlignment = VerticalAlignment.Bottom
}

Dim stampersToApply() As Stamper = { stamper1, stamper2 }
pdf.ApplyMultipleStamps(stampersToApply)
pdf.ApplyStamp(stamper2)
VB   C#

将图像印到 PDF 上

将图片印章应用于现有PDF文档的各种页面组合：

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-19.cs
var pdf = new PdfDocument("/attachments/2022_Q1_sales.pdf");

ImageStamper logoImageStamper = new ImageStamper("/assets/logo.png");

// Apply to every page, one page, or some pages
pdf.ApplyStamp(logoImageStamper);
pdf.ApplyStamp(logoImageStamper, 0);
pdf.ApplyStamp(logoImageStamper, new[] { 0, 3, 11 });
Dim pdf = New PdfDocument("/attachments/2022_Q1_sales.pdf")

Dim logoImageStamper As New ImageStamper("/assets/logo.png")

' Apply to every page, one page, or some pages
pdf.ApplyStamp(logoImageStamper)
pdf.ApplyStamp(logoImageStamper, 0)
pdf.ApplyStamp(logoImageStamper, { 0, 3, 11 })
VB   C#

在 PDF 上加印 HTML

编写您自己的HTML用作印章：

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-20.cs
var renderer = new ChromePdfRenderer();
var pdf = renderer.RenderHtmlAsPdf("<p>Hello World, example HTML body.</p>");

HtmlStamper stamper = new HtmlStamper($"<p>Example HTML Stamped</p><div style='width:250pt;height:250pt;background-color:red;'></div>")
{
    HorizontalOffset = new Length(-3, MeasurementUnit.Inch),
    VerticalAlignment = VerticalAlignment.Bottom
};

pdf.ApplyStamp(stamper);
Dim renderer = New ChromePdfRenderer()
Dim pdf = renderer.RenderHtmlAsPdf("<p>Hello World, example HTML body.</p>")

Dim stamper As New HtmlStamper($"<p>Example HTML Stamped</p><div style='width:250pt;height:250pt;background-color:red;'></div>")
If True Then
'INSTANT VB WARNING: An assignment within expression was extracted from the following statement:
'ORIGINAL LINE: HorizontalOffset = new Length(-3, MeasurementUnit.Inch), VerticalAlignment = VerticalAlignment.Bottom
	New Length(-3, MeasurementUnit.Inch), VerticalAlignment = VerticalAlignment.Bottom
	HorizontalOffset = New Length(-3, MeasurementUnit.Inch), VerticalAlignment
End If

pdf.ApplyStamp(stamper)
VB   C#

在 PDF 上加印条形码

创建和盖章条形码的示例：

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-21.cs
BarcodeStamper bcStamp = new BarcodeStamper("IronPDF", BarcodeEncoding.Code39);

bcStamp.HorizontalAlignment = HorizontalAlignment.Left;
bcStamp.VerticalAlignment = VerticalAlignment.Bottom;

var pdf = new PdfDocument("example.pdf");
pdf.ApplyStamp(bcStamp);
Dim bcStamp As New BarcodeStamper("IronPDF", BarcodeEncoding.Code39)

bcStamp.HorizontalAlignment = HorizontalAlignment.Left
bcStamp.VerticalAlignment = VerticalAlignment.Bottom

Dim pdf = New PdfDocument("example.pdf")
pdf.ApplyStamp(bcStamp)
VB   C#

在 PDF 上加盖 QR 码

创建和盖章二维码的示例：

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-22.cs
BarcodeStamper qrStamp = new BarcodeStamper("IronPDF", BarcodeEncoding.QRCode);

qrStamp.Height = 50; // pixels
qrStamp.Width = 50; // pixels

qrStamp.HorizontalAlignment = HorizontalAlignment.Left;
qrStamp.VerticalAlignment = VerticalAlignment.Bottom;

var pdf = new PdfDocument("example.pdf");
pdf.ApplyStamp(qrStamp);
Dim qrStamp As New BarcodeStamper("IronPDF", BarcodeEncoding.QRCode)

qrStamp.Height = 50 ' pixels
qrStamp.Width = 50 ' pixels

qrStamp.HorizontalAlignment = HorizontalAlignment.Left
qrStamp.VerticalAlignment = VerticalAlignment.Bottom

Dim pdf = New PdfDocument("example.pdf")
pdf.ApplyStamp(qrStamp)
VB   C#

为 PDF 添加水印

水印是一种可以使用 ApplyWatermark 方法轻松应用于每一页的印章类型：

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-23.cs
var pdf = new PdfDocument("/attachments/design.pdf");
string html = "<h1> Example Title <h1/>";
int rotation = 0;
int watermarkOpacity = 30;

pdf.ApplyWatermark(html, rotation, watermarkOpacity);
Dim pdf = New PdfDocument("/attachments/design.pdf")
Dim html As String = "<h1> Example Title <h1/>"
Dim rotation As Integer = 0
Dim watermarkOpacity As Integer = 30

pdf.ApplyWatermark(html, rotation, watermarkOpacity)
VB   C#

要查看代码示例页面上的水印示例，请访问这里.

在 PDF 上应用印章

有几种重载 ApplyStamp 方法的方式，可以用来将您的印章应用到 PDF 上。

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-24.cs
var pdf = new PdfDocument("/assets/example.pdf");

// Apply one stamp to all pages
pdf.ApplyStamp(myStamper);

// Apply one stamp to a specific page
pdf.ApplyStamp(myStamper, 0);

// Apply one stamp to specific pages
pdf.ApplyStamp(myStamper, new[] { 0, 3, 5 });

// Apply a stamp array to all pages
pdf.ApplyMultipleStamps(stampArray);

// Apply a stamp array to a specific page
pdf.ApplyMultipleStamps(stampArray, 0);

// Apply a stamp array to specific pages
pdf.ApplyMultipleStamps(stampArray, new[] { 0, 3, 5 });

// And some Async versions of the above
await pdf.ApplyStampAsync(myStamper, 4);
await pdf.ApplyMultipleStampsAsync(stampArray);

// Additional Watermark apply method
string html = "<h1> Example Title <h1/>";
int rotation = 0;
int watermarkOpacity = 30;
pdf.ApplyWatermark(html, rotation, watermarkOpacity);
Dim pdf = New PdfDocument("/assets/example.pdf")

' Apply one stamp to all pages
pdf.ApplyStamp(myStamper)

' Apply one stamp to a specific page
pdf.ApplyStamp(myStamper, 0)

' Apply one stamp to specific pages
pdf.ApplyStamp(myStamper, { 0, 3, 5 })

' Apply a stamp array to all pages
pdf.ApplyMultipleStamps(stampArray)

' Apply a stamp array to a specific page
pdf.ApplyMultipleStamps(stampArray, 0)

' Apply a stamp array to specific pages
pdf.ApplyMultipleStamps(stampArray, { 0, 3, 5 })

' And some Async versions of the above
Await pdf.ApplyStampAsync(myStamper, 4)
Await pdf.ApplyMultipleStampsAsync(stampArray)

' Additional Watermark apply method
Dim html As String = "<h1> Example Title <h1/>"
Dim rotation As Integer = 0
Dim watermarkOpacity As Integer = 30
pdf.ApplyWatermark(html, rotation, watermarkOpacity)
VB   C#

长度类

Length 类有两个属性：Unit 和 Value。 一旦您决定使用 MeasurementUnit 枚举中的哪个单位(默认为页面的 `百分比)然后选择 "值"，以决定使用基本单位倍数的长度量。

长度类属性

class Length

└─── double : Value (default : 0)

└─── MeasurementUnit : Unit

   Inch

   Millimeter

   Centimeter

   Percentage (default)

   Pixel

   Points

长度示例

创建长度

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-25.cs
new Length(value: 5, unit: MeasurementUnit.Inch); // 5 inches

new Length(value: 25, unit: MeasurementUnit.Pixel);// 25px

new Length(); // 0% of the page dimension because value is defaulted to zero and unit is defaulted to percentage

new Length(value: 20); // 20% of the page dimension
Dim tempVar As New Length(value:= 5, unit:= MeasurementUnit.Inch) ' 5 inches

Dim tempVar2 As New Length(value:= 25, unit:= MeasurementUnit.Pixel) ' 25px

Dim tempVar3 As New Length() ' 0% of the page dimension because value is defaulted to zero and unit is defaulted to percentage

Dim tempVar4 As New Length(value:= 20) ' 20% of the page dimension
VB   C#

使用长度作为参数

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-26.cs
HtmlStamper logoStamper = new HtmlStamper
{
    VerticalOffset = new Length(15, MeasurementUnit.Percentage),
    HorizontalOffset = new Length(1, MeasurementUnit.Inch)
    // set other properties...
};
Dim logoStamper As New HtmlStamper With {
	.VerticalOffset = New Length(15, MeasurementUnit.Percentage),
	.HorizontalOffset = New Length(1, MeasurementUnit.Inch)
}
VB   C#

在 PDF 文件中使用表单

创建和编辑表格

使用IronPDF创建一个包含嵌入式表单字段的PDF：

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-27.cs
// Step 1.  Creating a PDF with editable forms from HTML using form and input tags
const string formHtml = @"
    <html>
        <body>
            <h2>Editable PDF  Form</h2>
            <form>
              First name: <br> <input type='text' name='firstname' value=''> <br>
              Last name: <br> <input type='text' name='lastname' value=''>
            </form>
        </body>
    </html>";

// Instantiate Renderer
var renderer = new ChromePdfRenderer();
renderer.RenderingOptions.CreatePdfFormsFromHtml = true;
renderer.RenderHtmlAsPdf(formHtml).SaveAs("BasicForm.pdf");

// Step 2. Reading and Writing PDF form values.
var formDocument = PdfDocument.FromFile("BasicForm.pdf");

// Read the value of the "firstname" field
var firstNameField = formDocument.Form.FindFormField("firstname");

// Read the value of the "lastname" field
var lastNameField = formDocument.Form.FindFormField("lastname");
' Step 1.  Creating a PDF with editable forms from HTML using form and input tags
Const formHtml As String = "
    <html>
        <body>
            <h2>Editable PDF  Form</h2>
            <form>
              First name: <br> <input type='text' name='firstname' value=''> <br>
              Last name: <br> <input type='text' name='lastname' value=''>
            </form>
        </body>
    </html>"

' Instantiate Renderer
Dim renderer = New ChromePdfRenderer()
renderer.RenderingOptions.CreatePdfFormsFromHtml = True
renderer.RenderHtmlAsPdf(formHtml).SaveAs("BasicForm.pdf")

' Step 2. Reading and Writing PDF form values.
Dim formDocument = PdfDocument.FromFile("BasicForm.pdf")

' Read the value of the "firstname" field
Dim firstNameField = formDocument.Form.FindFormField("firstname")

' Read the value of the "lastname" field
Dim lastNameField = formDocument.Form.FindFormField("lastname")
VB   C#

要查看代码示例页面上的 PDF 表单示例，请访问这里.

填写现有表格

使用IronPDF，您可以轻松访问PDF中的所有现有表单字段并填写它们以便重新保存：

:path=/static-assets/pdf/content-code-examples/tutorials/csharp-edit-pdf-complete-28.cs
var formDocument = PdfDocument.FromFile("BasicForm.pdf");

// Set and Read the value of the "firstname" field
var firstNameField = formDocument.Form.FindFormField("firstname");
firstNameField.Value = "Minnie";
Console.WriteLine("FirstNameField value: {0}", firstNameField.Value);

// Set and Read the value of the "lastname" field
var lastNameField = formDocument.Form.FindFormField("lastname");
lastNameField.Value = "Mouse";
Console.WriteLine("LastNameField value: {0}", lastNameField.Value);

formDocument.SaveAs("FilledForm.pdf");
Dim formDocument = PdfDocument.FromFile("BasicForm.pdf")

' Set and Read the value of the "firstname" field
Dim firstNameField = formDocument.Form.FindFormField("firstname")
firstNameField.Value = "Minnie"
Console.WriteLine("FirstNameField value: {0}", firstNameField.Value)

' Set and Read the value of the "lastname" field
Dim lastNameField = formDocument.Form.FindFormField("lastname")
lastNameField.Value = "Mouse"
Console.WriteLine("LastNameField value: {0}", lastNameField.Value)

formDocument.SaveAs("FilledForm.pdf")
VB   C#

要查看代码示例页面上的 PDF 表单示例，请访问这里.

结论

上述示例清单表明，IronPDF 具有关键功能，可以在编辑 PDF 时开箱即用。

如果您想提出功能请求或对IronPDF或许可有任何一般性问题，请联系我们的支持团队. 我们将非常乐意为您提供帮助。