.NET 中的 NuGet PDF 生成器（開發者教學）

HTML 至 PDF 轉換

IronPDF 具備將 HTML 內容轉換為 PDF 文件的功能。 這可讓開發人員從現有的 HTML 頁面建立 PDF 檔案，或從使用者產生的內容動態產生 PDF。 以下是如何將 HTML 字串轉換為 PDF 文件的範例：

using IronPdf;

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

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

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

using IronPdf;

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

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

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

URL 至 PDF 文件

IronPDF 可讓開發人員 將網頁直接轉換為 PDF 文件。 此功能對於開發人員需要從即時網頁產生 PDF 文件或儲存線上內容以供離線檢視、歸檔或分享的情境特別有用。

利用 IronPDF 的 HTML-to-PDF 轉換功能，開發人員只需幾行程式碼，就能輕鬆地將整個網頁（包括其文字、圖片和樣式）轉換成 PDF 文件。 以下是此功能如何運作的快速概覽：

using IronPdf;

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

// Create a PDF from a URL or local file path
var pdf = renderer.RenderUrlAsPdf("https://ironpdf.com/");

// Export to a file or Stream
pdf.SaveAs("url.pdf");

using IronPdf;

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

// Create a PDF from a URL or local file path
var pdf = renderer.RenderUrlAsPdf("https://ironpdf.com/");

// Export to a file or Stream
pdf.SaveAs("url.pdf");

修改 PDF 檔案

IronPdf 還能讓開發人員修改現有的 PDF 文件和檔案，輕鬆添加或移除內容、合併文件以及套用安全設定。 以下是如何在 PDF 文件中添加水印的示例：

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("SAMPLE", 30, IronPdf.Editing.VerticalAlignment.Middle, IronPdf.Editing.HorizontalAlignment.Center);
pdf.SaveAs(@"C:\Path\To\Watermarked.pdf");

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("SAMPLE", 30, IronPdf.Editing.VerticalAlignment.Middle, IronPdf.Editing.HorizontalAlignment.Center);
pdf.SaveAs(@"C:\Path\To\Watermarked.pdf");

。

本範例專案示範如何從 URL 建立 PDF 文件，為每頁新增水印，並將修改後的文件儲存為新檔案。

使用 IronPDF 的高級 PDF 功能。

除了前面討論的基本 PDF 檔案建立作業之外，IronPDF 還提供進階功能，可進一步增強您的 PDF 文件產生與管理能力。 這些功能包括

合併 PDF 文件： IronPDF 可讓您將多個 PDF 文件合併為單一文件，輕鬆編輯和整理相關內容。

using IronPdf;

var htmlA = @"<h1>[PDF_A]</h1><p>[PDF_A] 1st Page</p><p>[PDF_A] 2nd Page</p>";
var htmlB = @"<h1>[PDF_B]</h1><p>[PDF_B] 1st Page</p><p>[PDF_B] 2nd Page</p>";

var renderer = new ChromePdfRenderer();

var pdfDocA = renderer.RenderHtmlAsPdf(htmlA);
var pdfDocB = renderer.RenderHtmlAsPdf(htmlB);
var merged = PdfDocument.Merge(pdfDocA, pdfDocB);

merged.SaveAs("Merged.pdf");

using IronPdf;

var htmlA = @"<h1>[PDF_A]</h1><p>[PDF_A] 1st Page</p><p>[PDF_A] 2nd Page</p>";
var htmlB = @"<h1>[PDF_B]</h1><p>[PDF_B] 1st Page</p><p>[PDF_B] 2nd Page</p>";

var renderer = new ChromePdfRenderer();

var pdfDocA = renderer.RenderHtmlAsPdf(htmlA);
var pdfDocB = renderer.RenderHtmlAsPdf(htmlB);
var merged = PdfDocument.Merge(pdfDocA, pdfDocB);

merged.SaveAs("Merged.pdf");

PDF 表單： IronPDF 支援 PDF 表單的建立與操作，讓開發人員可以產生具有可填寫欄位的動態化、互動式 PDF 文件。

using IronPdf;
using System;

// Step 1. Creating a PDF with editable forms from HTML using form and input tags
// Radio Button and Checkbox can also be implemented with input type 'radio' and 'checkbox'
const string formHtml = @"
    <h1>Editable PDF Form</h1>
    <label>First name: <input type='text' name='firstname' /></label>
    <label>Last name: <input type='text' name='lastname' /></label>
    <p>Please specify your gender:</p>
    <label><input type='radio' name='gender' value='female' /> Female</label>
    <label><input type='radio' name='gender' value='male' /> Male</label>
    <label><input type='radio' name='gender' value='other' /> Non-Binary / Other</label>
    <p>Please select all medical conditions that apply:</p>
    <label><input type='checkbox' name='condition' value='hypertension' /> Hypertension</label>
    <label><input type='checkbox' name='condition' value='heartDisease' /> Heart Disease</label>
    <label><input type='checkbox' name='condition' value='stroke' /> Stroke</label>
    <label><input type='checkbox' name='condition' value='diabetes' /> Diabetes</label>
    <label><input type='checkbox' name='condition' value='kidneyDisease' /> Kidney Disease</label>
";

// 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");

// 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");

using IronPdf;
using System;

// Step 1. Creating a PDF with editable forms from HTML using form and input tags
// Radio Button and Checkbox can also be implemented with input type 'radio' and 'checkbox'
const string formHtml = @"
    <h1>Editable PDF Form</h1>
    <label>First name: <input type='text' name='firstname' /></label>
    <label>Last name: <input type='text' name='lastname' /></label>
    <p>Please specify your gender:</p>
    <label><input type='radio' name='gender' value='female' /> Female</label>
    <label><input type='radio' name='gender' value='male' /> Male</label>
    <label><input type='radio' name='gender' value='other' /> Non-Binary / Other</label>
    <p>Please select all medical conditions that apply:</p>
    <label><input type='checkbox' name='condition' value='hypertension' /> Hypertension</label>
    <label><input type='checkbox' name='condition' value='heartDisease' /> Heart Disease</label>
    <label><input type='checkbox' name='condition' value='stroke' /> Stroke</label>
    <label><input type='checkbox' name='condition' value='diabetes' /> Diabetes</label>
    <label><input type='checkbox' name='condition' value='kidneyDisease' /> Kidney Disease</label>
";

// 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");

// 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");

PDF 安全性： IronPDF 提供了保護 PDF 文件的選項，包括密碼保護和加密。

using IronPdf;

// Open an Encrypted File, alternatively create a new PDF from Html
var pdf = PdfDocument.FromFile("encrypted.pdf");

//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;

//Change or set the document encryption password
pdf.SecuritySettings.OwnerPassword = "top-secret"; // password to edit the pdf
pdf.SaveAs("secured.pdf");

using IronPdf;

// Open an Encrypted File, alternatively create a new PDF from Html
var pdf = PdfDocument.FromFile("encrypted.pdf");

//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;

//Change or set the document encryption password
pdf.SecuritySettings.OwnerPassword = "top-secret"; // password to edit the pdf
pdf.SaveAs("secured.pdf");

IronPDF 的先進功能使其成為在 .NET 應用程式中需要全面 PDF 功能的開發人員的寶貴工具。 從合併文件和管理表單，到保護內容和自訂渲染，IronPDF 為您所有的 PDF 需求提供強大的解決方案。