如何使用C#將圖像轉換為PDF【代碼示例教程】

Create a Visual Studio Project

To create a new project, open Microsoft Visual Studio. It is recommended to use the latest version of Visual Studio. The steps for creating a new project may differ between versions, but the remainder should be the same for every version.

1. Click on Create New Project.
2. Select Project Template, then select the Console Application template for this demonstration. You can use any as per your requirement.
3. Click on Next. Name the Project.
4. Click Next and select the .NET Framework version.
5. Click the Create button.

The new project will be created as shown below.

Create a new Console Application in Visual Studio

Next, install the IronPDF NuGet Package in this project to use its features. The interesting thing about IronPDF is that it takes the frustration out of generating PDF documents by not relying on proprietary APIs. HTML to PDF rendering example renders pixel-perfect PDFs from open standard document types: HTML, JS, CSS, JPG, PNG, GIF, and SVG. In short, it uses the skills that developers already possess.

Install the IronPDF NuGet Package

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

Package Manager Console UI

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

Install-Package IronPdf

Press Enter.

Install the IronPdf package in the Package Manager Console

Convert Image File to PDF Document

The next step will show how to convert the following image to PDF.

using IronPdf;

using IronPdf;

Imports IronPdf

public static void Main(string[] args)
{
    // Convert a single image to the PDF document
    PdfDocument doc = ImageToPdfConverter.ImageToPdf(@"D:\Iron Software\ImageToPDF\bird.jpg", IronPdf.Imaging.ImageBehavior.CropPage);
    // Save the resulting PDF to the specified path
    doc.SaveAs(@"D:\Iron Software\ImageToPDF\bird.pdf");
}

public static void Main(string[] args)
{
    // Convert a single image to the PDF document
    PdfDocument doc = ImageToPdfConverter.ImageToPdf(@"D:\Iron Software\ImageToPDF\bird.jpg", IronPdf.Imaging.ImageBehavior.CropPage);
    // Save the resulting PDF to the specified path
    doc.SaveAs(@"D:\Iron Software\ImageToPDF\bird.pdf");
}

Public Shared Sub Main(ByVal args() As String)
	' Convert a single image to the PDF document
	Dim doc As PdfDocument = ImageToPdfConverter.ImageToPdf("D:\Iron Software\ImageToPDF\bird.jpg", IronPdf.Imaging.ImageBehavior.CropPage)
	' Save the resulting PDF to the specified path
	doc.SaveAs("D:\Iron Software\ImageToPDF\bird.pdf")
End Sub

ImageToPdfConverter.PaperSize = IronPdf.Rendering.PdfPaperSize.Letter;

ImageToPdfConverter.PaperSize = IronPdf.Rendering.PdfPaperSize.Letter;

ImageToPdfConverter.PaperSize = IronPdf.Rendering.PdfPaperSize.Letter

Convert Multiple Images to a PDF File

The following example will convert JPG images into a new document.

public static void Main(string[] args)
{
    // Enumerate and filter JPG files from the specified directory
    var imageFiles = System.IO.Directory.EnumerateFiles(@"D:\Iron Software\ImageToPDF\")
                                        .Where(f => f.EndsWith(".jpg") || f.EndsWith(".jpeg"));
    // Convert the images to a PDF document and save it
    PdfDocument doc = ImageToPdfConverter.ImageToPdf(imageFiles);
    doc.SaveAs(@"D:\Iron Software\ImageToPDF\JpgToPDF.pdf");
}

public static void Main(string[] args)
{
    // Enumerate and filter JPG files from the specified directory
    var imageFiles = System.IO.Directory.EnumerateFiles(@"D:\Iron Software\ImageToPDF\")
                                        .Where(f => f.EndsWith(".jpg") || f.EndsWith(".jpeg"));
    // Convert the images to a PDF document and save it
    PdfDocument doc = ImageToPdfConverter.ImageToPdf(imageFiles);
    doc.SaveAs(@"D:\Iron Software\ImageToPDF\JpgToPDF.pdf");
}

Public Shared Sub Main(ByVal args() As String)
	' Enumerate and filter JPG files from the specified directory
	Dim imageFiles = System.IO.Directory.EnumerateFiles("D:\Iron Software\ImageToPDF\").Where(Function(f) f.EndsWith(".jpg") OrElse f.EndsWith(".jpeg"))
	' Convert the images to a PDF document and save it
	Dim doc As PdfDocument = ImageToPdfConverter.ImageToPdf(imageFiles)
	doc.SaveAs("D:\Iron Software\ImageToPDF\JpgToPDF.pdf")
End Sub

In the above code, System.IO.Directory.EnumerateFiles retrieves all files available in the specified folder. The Where clause filters all the JPG images from that folder and stores them in the imageFiles collection. If you have PNG or any other image format, you can just add that to the Where query.

The next line will take all the images and combine them into a single PDF document.

Print PDF File

The following code snippet will print the document:

doc.Print();

doc.Print();

doc.Print()

The Print method provided by the PdfDocument class will print the document using the default printer. It also provides an option to change the printer name and other settings. For more details about printing documents, please visit this PDF printing example.

Summary

This tutorial showed a very easy way to convert images into a PDF file with code examples, either converting a single image into a PDF or combining multiple images into a single PDF file. Moreover, it also explained how to print documents with a single line of code.

Additionally, some of the important features of IronPDF include:

• Generate PDF documents from URLs.
• Encrypting and decrypting PDFs.
• Merging existing PDF files.
• Creating and editing PDF forms.

There are multiple useful and interesting features provided by IronPDF, please visit this IronPDF homepage for more details.

IronPDF is a part of the Iron Software suite. The Iron Suite includes additional interesting products such as IronXL, IronBarcode, IronOCR, and IronWebscraper, and all of these products are extremely useful. 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. Please visit the licensing details page for more details.