如何在 PDF 中添加頁碼

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由喬迪

頁碼是指派給PDF文件中每個單獨頁面的連續數字。頁碼是文件導航中最重要的組件之一。他們幫助讀者找到特定的頁面並確定他們正在閱讀的頁面。此外，頁碼方便在文件中引用和參考內容。使用 IronPDF，為您的 PDF 添加頁碼是一個簡單的過程。

開始使用 IronPDF

立即在您的專案中使用IronPDF，並享受免費試用。

第一步：

如何在 PDF 中添加頁碼

從NuGet下載C# PDF庫
載入現有的PDF文件或渲染新的文件
在中使用佔位字串 {page} 和 {total-pages} 標題和頁腳插入頁碼
將頁碼應用於特定頁面或部分
檢查生成的PDF文件

新增頁碼範例

使用佔位符字串{頁面}和{總頁數}使用 TextHeaderFooter 或 HtmlHeaderFooter 類別，您可以添加當前頁碼和總頁數。

:path=/static-assets/pdf/content-code-examples/how-to/page-numbers-basic.cs

using IronPdf;

// Create text header
TextHeaderFooter textHeader = new TextHeaderFooter()
{
    CenterText = "{page} of {total-pages}"
};

// Create html footer
HtmlHeaderFooter htmlFooter = new HtmlHeaderFooter()
{
    HtmlFragment = "<center><i>{page} of {total-pages}<i></center>"
};

// Render a new PDF
ChromePdfRenderer renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>Hello World!</h1>");

// Add header and footer
pdf.AddTextHeaders(textHeader);
pdf.AddHtmlFooters(htmlFooter);

pdf.SaveAs("pdfWithPageNumber.pdf");

Imports IronPdf

' Create text header
Private textHeader As New TextHeaderFooter() With {.CenterText = "{page} of {total-pages}"}

' Create html footer
Private htmlFooter As New HtmlHeaderFooter() With {.HtmlFragment = "<center><i>{page} of {total-pages}<i></center>"}

' Render a new PDF
Private renderer As New ChromePdfRenderer()
Private pdf As PdfDocument = renderer.RenderHtmlAsPdf("<h1>Hello World!</h1>")

' Add header and footer
pdf.AddTextHeaders(textHeader)
pdf.AddHtmlFooters(htmlFooter)

pdf.SaveAs("pdfWithPageNumber.pdf")

VB C#

上面代碼生成的 PDF 如下所示：

您也可以直接將具有頁碼佔位符字串的頁首和頁尾添加到 ChromePdfRenderer 的渲染選項中。

:path=/static-assets/pdf/content-code-examples/how-to/page-numbers-chromerenderer.cs

using IronPdf;

// Add header and footer to rendering options
ChromePdfRenderer renderer = new ChromePdfRenderer();
renderer.RenderingOptions.TextHeader = new TextHeaderFooter()
{
    CenterText = "{page} of {total-pages}"
};
renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter()
{
    HtmlFragment = "<center><i>{page} of {total-pages}<i></center>"
};

string html = @"
    <h1>Hello World!</h1>
<div style='page-break-after: always;'/>
    <h1>2nd Page!</h1>";

// Render new PDF
PdfDocument pdf = renderer.RenderHtmlAsPdf(html);

pdf.SaveAs("applyPageNumberWithRenderingOptions.pdf");

Imports IronPdf

' Add header and footer to rendering options
Private renderer As New ChromePdfRenderer()
renderer.RenderingOptions.TextHeader = New TextHeaderFooter() With {.CenterText = "{page} of {total-pages}"}
renderer.RenderingOptions.HtmlFooter = New HtmlHeaderFooter() With {.HtmlFragment = "<center><i>{page} of {total-pages}<i></center>"}

Dim html As String = "
    <h1>Hello World!</h1>
<div style='page-break-after: always;'/>
    <h1>2nd Page!</h1>"

' Render new PDF
Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf(html)

pdf.SaveAs("applyPageNumberWithRenderingOptions.pdf")

VB C#

將頁碼添加到特定頁面示例

使用 IronPDF，您可以決定在哪裡添加頁碼。您可以讓它們從某特定頁面或某些組的頁面開始，例如從偶數索引頁面開始。

讓我們準備我們的PDF文件，以便應用頁碼。

:path=/static-assets/pdf/content-code-examples/how-to/page-numbers-preparation.cs

using IronPdf;
using System.Linq;
using System.Collections.Generic;

string multi_page_html = @"
    <p>This is the 1st Page</p>
<div style = 'page-break-after: always;' ></div>
    <p>This is the 2nd Page</p>
<div style = 'page-break-after: always;' ></div>
    <p>This is the 3rd Page</p>
<div style = 'page-break-after: always;' ></div>
    <p>This is the 4th Page</p>
<div style = 'page-break-after: always;' ></div>
    <p>This is the 5th Page</p>
<div style = 'page-break-after: always;' ></div>
    <p>This is the 6th Page</p>
<div style = 'page-break-after: always;' ></div>
    <p>This is the 7th Page</p>";

// Create header
HtmlHeaderFooter header = new HtmlHeaderFooter()
{
    HtmlFragment = "<center><i>{page} of {total-pages}<i></center>"
};

// Render PDF
ChromePdfRenderer renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlAsPdf(multi_page_html);

// Create a Page Range 0..6
var allPageIndices = Enumerable.Range(0, pdf.PageCount);

Imports IronPdf
Imports System.Linq
Imports System.Collections.Generic

Private multi_page_html As String = "
    <p>This is the 1st Page</p>
<div style = 'page-break-after: always;' ></div>
    <p>This is the 2nd Page</p>
<div style = 'page-break-after: always;' ></div>
    <p>This is the 3rd Page</p>
<div style = 'page-break-after: always;' ></div>
    <p>This is the 4th Page</p>
<div style = 'page-break-after: always;' ></div>
    <p>This is the 5th Page</p>
<div style = 'page-break-after: always;' ></div>
    <p>This is the 6th Page</p>
<div style = 'page-break-after: always;' ></div>
    <p>This is the 7th Page</p>"

' Create header
Private header As New HtmlHeaderFooter() With {.HtmlFragment = "<center><i>{page} of {total-pages}<i></center>"}

' Render PDF
Private renderer As New ChromePdfRenderer()
Private pdf As PdfDocument = renderer.RenderHtmlAsPdf(multi_page_html)

' Create a Page Range 0..6
Private allPageIndices = Enumerable.Range(0, pdf.PageCount)

VB C#

偶數頁索引

在之前的代碼示例上，下面的代碼將專門為偶數頁索引應用頁碼。由於我們正在過濾偶數頁面索引，因此生成的PDF將僅應用於奇數頁面。頁面索引從零開始，而頁碼則從一開始。

:path=/static-assets/pdf/content-code-examples/how-to/page-numbers-even-pages.cs

// Get even page indexes (resulting in odd page numbers)
var evenPageIndices = allPageIndices.Where(i => i % 2 == 0);

pdf.AddHtmlHeaders(header, 1, evenPageIndices);
pdf.SaveAs("EvenPages.pdf");

' Get even page indexes (resulting in odd page numbers)
Dim evenPageIndices = allPageIndices.Where(Function(i) i Mod 2 = 0)

pdf.AddHtmlHeaders(header, 1, evenPageIndices)
pdf.SaveAs("EvenPages.pdf")

VB C#

奇數頁索引

僅將頁碼添加到具有奇數索引號的頁面上。

:path=/static-assets/pdf/content-code-examples/how-to/page-numbers-odd-pages.cs

// Get odd page indexes (resulting in even page numbers)
var oddPageIndexes = allPageIndices.Where(i => i % 2 != 0);

pdf.AddHtmlHeaders(header, 1, oddPageIndexes);
pdf.SaveAs("OddPages.pdf");

' Get odd page indexes (resulting in even page numbers)
Dim oddPageIndexes = allPageIndices.Where(Function(i) i Mod 2 <> 0)

pdf.AddHtmlHeaders(header, 1, oddPageIndexes)
pdf.SaveAs("OddPages.pdf")

VB C#

僅限最後一頁

僅在最後一頁添加頁碼。

:path=/static-assets/pdf/content-code-examples/how-to/page-numbers-last-page-only.cs

// Last page only
var lastPageIndex = new List<int>() { pdf.PageCount - 1 };

pdf.AddHtmlHeaders(header, 1, lastPageIndex);
pdf.SaveAs("LastPageOnly.pdf");

' Last page only
Dim lastPageIndex = New List(Of Integer)() From {pdf.PageCount - 1}

pdf.AddHtmlHeaders(header, 1, lastPageIndex)
pdf.SaveAs("LastPageOnly.pdf")

VB C#

僅首頁

僅在第一頁添加頁碼。

:path=/static-assets/pdf/content-code-examples/how-to/page-numbers-first-page-only.cs

// First page only
var firstPageIndex = new List<int>() { 0 };

pdf.AddHtmlHeaders(header, 1, firstPageIndex);
pdf.SaveAs("FirstPageOnly.pdf");

' First page only
Dim firstPageIndex = New List(Of Integer)() From {0}

pdf.AddHtmlHeaders(header, 1, firstPageIndex)
pdf.SaveAs("FirstPageOnly.pdf")

VB C#

跳過第一頁

在套用頁首時跳過第一頁。

:path=/static-assets/pdf/content-code-examples/how-to/page-numbers-skip-first-page.cs

// Skip the first page
var skipFirstPage = allPageIndices.Skip(1);

pdf.AddHtmlHeaders(header, 1, skipFirstPage);
pdf.SaveAs("SkipFirstPage.pdf");

' Skip the first page
Dim skipFirstPage = allPageIndices.Skip(1)

pdf.AddHtmlHeaders(header, 1, skipFirstPage)
pdf.SaveAs("SkipFirstPage.pdf")

VB C#

跳過第一頁並不計算它

跳過第一頁，從第二頁開始編號，將其視為第1頁。

:path=/static-assets/pdf/content-code-examples/how-to/page-numbers-skip-first-page-and-dont-count-it.cs

// Skip the first page and start numbering the second page as page 1
var skipFirstPageAndDontCountIt = allPageIndices.Skip(1);

pdf.AddHtmlHeaders(header, 0, skipFirstPageAndDontCountIt);
pdf.SaveAs("SkipFirstPageAndDontCountIt.pdf");

' Skip the first page and start numbering the second page as page 1
Dim skipFirstPageAndDontCountIt = allPageIndices.Skip(1)

pdf.AddHtmlHeaders(header, 0, skipFirstPageAndDontCountIt)
pdf.SaveAs("SkipFirstPageAndDontCountIt.pdf")

VB C#

如需探索所有元數據選項，請訪問IronPDF 頁眉和頁腳指南.