C#文本到PDF（代碼示例教程）

Create a Visual Studio Project

Open Microsoft Visual Studio. Click on Create New Project. Select the template "Console Application" for simplicity, but you can use Windows Forms, ASP.NET Web Forms, MVC, Web APIs, or any template as per your needs.

Select Next, Name the Project, Select Target Framework, and press Create. A new console project will be created.

Create a new Console Application in Visual Studio

Next, install the NuGet Package for IronPDF.

IronPDF is a .NET library for generating, reading, editing, and saving PDF files in .NET projects. IronPDF features HTML-to-PDF for .NET 5 Core, Standard, and Framework, with full HTML-to-PDF support including CSS3 and JS.

Install the NuGet Package

To install the IronPDF NuGet Package, go to Tools > NuGet Package Manager > Package Manager Console. The following window will appear:

Package Manager Console

Next, write the following command in the Package Manager Console.

Install-Package IronPdf

Press Enter.

Installation progress in the Package Manager Console

This will install the IronPDF library to be able to use all the functionalities provided by this library anywhere in the project.

Convert Text to PDF

Next, let's address the main task here --- converting C# text into a PDF file.

Firstly, reference the IronPDF library in the program.cs file. Write the following code snippet at the top of the file.

using IronPdf;

using IronPdf;

Imports IronPdf

Next, write the following code inside the main function. This code will convert text to PDF.

// Create an instance of ChromePdfRenderer, which is responsible for rendering HTML into PDF
ChromePdfRenderer renderer = new ChromePdfRenderer();

// Render a simple HTML string as a PDF document
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>This is my PDF</h1><p>This is generated for the tutorial of C# txt to PDF</p>");

// Save the generated PDF document to a specified path
pdf.SaveAs(@"D:\Iron Software\textToPDF\myFirstPDF.pdf");

// Create an instance of ChromePdfRenderer, which is responsible for rendering HTML into PDF
ChromePdfRenderer renderer = new ChromePdfRenderer();

// Render a simple HTML string as a PDF document
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>This is my PDF</h1><p>This is generated for the tutorial of C# txt to PDF</p>");

// Save the generated PDF document to a specified path
pdf.SaveAs(@"D:\Iron Software\textToPDF\myFirstPDF.pdf");

' Create an instance of ChromePdfRenderer, which is responsible for rendering HTML into PDF
Dim renderer As New ChromePdfRenderer()

' Render a simple HTML string as a PDF document
Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf("<h1>This is my PDF</h1><p>This is generated for the tutorial of C# txt to PDF</p>")

' Save the generated PDF document to a specified path
pdf.SaveAs("D:\Iron Software\textToPDF\myFirstPDF.pdf")

TXT File to PDF file

In the above example, it shows how to convert simple TXT to PDF. Now, this example will demonstrate how to convert a text document into a PDF document.

Given a sample source TXT file as shown below.

The sample TXT file

The following code will convert a text file to PDF.

First, add the following namespace:

using System.IO;

using System.IO;

Imports System.IO

Write the following code snippet inside the main function.

// Read all text from a TXT file into a string
string text = File.ReadAllText(@"D:\Iron Software\textToPDF\myTxtFile.txt");

// Use the ChromePdfRenderer to render the text as a PDF document
ChromePdfRenderer renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlAsPdf(text);

// Save the resulting PDF file to a specified location
pdf.SaveAs(@"D:\Iron Software\textToPDF\textFileToPDF.pdf");

// Read all text from a TXT file into a string
string text = File.ReadAllText(@"D:\Iron Software\textToPDF\myTxtFile.txt");

// Use the ChromePdfRenderer to render the text as a PDF document
ChromePdfRenderer renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlAsPdf(text);

// Save the resulting PDF file to a specified location
pdf.SaveAs(@"D:\Iron Software\textToPDF\textFileToPDF.pdf");

' Read all text from a TXT file into a string
Dim text As String = File.ReadAllText("D:\Iron Software\textToPDF\myTxtFile.txt")

' Use the ChromePdfRenderer to render the text as a PDF document
Dim renderer As New ChromePdfRenderer()
Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf(text)

' Save the resulting PDF file to a specified location
pdf.SaveAs("D:\Iron Software\textToPDF\textFileToPDF.pdf")

File.ReadAllText will read all the text from the file specified in the argument of the function. This text is then held in a string variable.

This variable is then passed as an argument of the RenderHtmlAsPdf function. This function will convert text into a PDF document.

Finally, specify the output filename in the SaveAs function.

// Apply a watermark to the PDF with specified text and layout properties
pdf.ApplyWatermark("<h1>my Watermark</h1>", 45, 45, IronPdf.Editing.VerticalAlignment.Top, IronPdf.Editing.HorizontalAlignment.Center);

// Save the PDF with the watermark applied
pdf.SaveAs(@"D:\Iron Software\textToPDF\myFirstPDF.pdf");

// Apply a watermark to the PDF with specified text and layout properties
pdf.ApplyWatermark("<h1>my Watermark</h1>", 45, 45, IronPdf.Editing.VerticalAlignment.Top, IronPdf.Editing.HorizontalAlignment.Center);

// Save the PDF with the watermark applied
pdf.SaveAs(@"D:\Iron Software\textToPDF\myFirstPDF.pdf");

' Apply a watermark to the PDF with specified text and layout properties
pdf.ApplyWatermark("<h1>my Watermark</h1>", 45, 45, IronPdf.Editing.VerticalAlignment.Top, IronPdf.Editing.HorizontalAlignment.Center)

' Save the PDF with the watermark applied
pdf.SaveAs("D:\Iron Software\textToPDF\myFirstPDF.pdf")

// Print the PDF document to the default printer
pdf.Print();

// Print the PDF document to the default printer
pdf.Print();

' Print the PDF document to the default printer
pdf.Print()

Summary

This tutorial showed a very easy way to convert text into a PDF file with step-by-step examples and code explanations: convert text to PDF, generate a PDF from a TXT file, and print this PDF file. Moreover, it covered how to add watermarks to the documents.

There are multiple useful and interesting features provided by IronPDF such as rendering charts in PDFs, adding barcodes, enhancing security with passwords, and even handling PDF forms, but it is impossible to cover them all here. For more details, please visit the IronPDF Feature Overview.

IronPDF is a part of the Iron Software Suite. The suite includes an array of interesting products including IronXL, IronBarcode, IronOCR, and IronWebScraper. It is assured that you will find all of these products helpful. You can save up to 250% by purchasing the complete Iron Suite, as you can currently get all five products for the price of just two. For more details, please check the Iron Software Suite Pricing.

Extracting Text with IronOCR into Searchable PDFs

Another method for creating PDF documents from provided text would be to make use of the IronOCR library to extract text from scanned documents and images, and then use the extracted content to create a new PDF document. So why do this instead of simply using the scanned document?

Scanned documents are not easy to modify or search, as they are still just images, only with text instead of pictures. So how would you create searchable PDFs, what exactly is IronOCR, and how could we make it work with IronPDF? Let’s take a look at how each of these questions can be answered.

IronOCR: What is it?

IronOCR is a powerful .NET library that lets developers like yourself perform OCR tasks with ease on provided images, scanned documents, and even specialized formats such as passports and license plates. In addition to powerful OCR capabilities, IronOCR also provides the tools to refine your images if they need to be edited in order to be easier scanned. These editing tools include the DeNoise(), Sharpen() and Deskew(), to name a few.

Extracting Text with IronOCR

Now, let’s take a look at how you can extract text from scanned documents and turn it into a searchable PDF that can then be used and edited by IronPDF. First, we’ll take a scanned document, like the one below, and load it into our code.

using IronOcr;

class Program
{
    static void Main(string[] args)
    {

        // Create an instance of the OCR Tesseract
        var ocr = new IronTesseract();

        // Enable searchable PDF output
        ocr.Configuration.RenderSearchablePdf = true;

        // Load a scanned document image
        using var input = new OcrInput();
        input.LoadImage("sample-page.png");

        // Perform OCR on the scanned document
        OcrResult result = ocr.Read(input);

        // Output the recognized text
        Console.WriteLine(result.Text);

        // Save the recognized text to a file
        result.SaveAsSearchablePdf("output.pdf");
    }
}

using IronOcr;

class Program
{
    static void Main(string[] args)
    {

        // Create an instance of the OCR Tesseract
        var ocr = new IronTesseract();

        // Enable searchable PDF output
        ocr.Configuration.RenderSearchablePdf = true;

        // Load a scanned document image
        using var input = new OcrInput();
        input.LoadImage("sample-page.png");

        // Perform OCR on the scanned document
        OcrResult result = ocr.Read(input);

        // Output the recognized text
        Console.WriteLine(result.Text);

        // Save the recognized text to a file
        result.SaveAsSearchablePdf("output.pdf");
    }
}

Imports IronOcr

Friend Class Program
	Shared Sub Main(ByVal args() As String)

		' Create an instance of the OCR Tesseract
		Dim ocr = New IronTesseract()

		' Enable searchable PDF output
		ocr.Configuration.RenderSearchablePdf = True

		' Load a scanned document image
		Dim input = New OcrInput()
		input.LoadImage("sample-page.png")

		' Perform OCR on the scanned document
		Dim result As OcrResult = ocr.Read(input)

		' Output the recognized text
		Console.WriteLine(result.Text)

		' Save the recognized text to a file
		result.SaveAsSearchablePdf("output.pdf")
	End Sub
End Class

Output

This creates a PDF document that maintains the original scanned document’s layout and styling, only now it is a searchable, easy-to-edit PDF document that can be used by IronPDF for further manipulation or sharing.

IronPDF and IronOCR Licensing

When working with powerful .NET libraries like IronPDF and IronOCR, developers often want clarity on how licensing works—especially in production environments. Both libraries follow IronSoftware’s straightforward licensing model, designed to support projects ranging from small prototypes to large-scale enterprise solutions.

IronPDF Licensing

IronPDF is licensed per developer with flexible deployment rights, meaning a single developer license covers unlimited usage across applications and servers. This makes it a cost-effective choice for teams that need to scale. Licenses are perpetual, so once purchased, they can be used indefinitely. Subscription options are also available for those who prefer annual renewals with updates and priority support included.

Want to try before you buy? Try the IronPDF free trial to test out its robust set of features for yourself.

IronOCR Licensing

IronOCR follows the same simple licensing model as IronPDF, offering per-developer licenses with unlimited deployment rights. This makes it especially appealing for projects that require scalable OCR functionality, such as document digitization, automated text extraction, or searchable PDF generation.

With IronOCR, licensing covers the entire suite of features, including support for 125+ languages, PDF text recognition, and advanced image-to-text conversions. Just like IronPDF, you can deploy to cloud services, containers, or enterprise servers without additional fees.

Just like IronPDF, IronOCR also offers a free trial for developers looking to try it out for themselves before purchasing a licence.

Why This Matters for Developers

Many competing PDF and OCR solutions add complexity with runtime licensing, per-server fees, or feature-based tiers. IronSoftware keeps it simple: one developer license unlocks the full power of the library across all your projects. This lets you focus on coding and delivering features—not tracking usage limits or negotiating enterprise contracts.