使用C#将PDF文件转换为图像

using System;
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;

public class PdfToImageConverter
{
    public static void ConvertToImage(string pdfFilePath, string outputFolderPath)
    {
        PdfReader reader = new PdfReader(pdfFilePath);

        for (int pageNumber = 1; pageNumber <= reader.NumberOfPages; pageNumber++)
        {
            string outputFilePath = Path.Combine(outputFolderPath, $"Page_{pageNumber}.png");

            using (FileStream fs = new FileStream(outputFilePath, FileMode.Create, FileAccess.Write))
            {
                Document document = new Document(reader.GetPageSizeWithRotation(pageNumber));
                PdfWriter writer = PdfWriter.GetInstance(document, fs);

                document.Open();
                PdfContentByte contentByte = writer.DirectContent;
                PdfImportedPage importedPage = writer.GetImportedPage(reader, pageNumber);

                contentByte.AddTemplate(importedPage, 0, 0);
                document.Close();
            }
        }

        reader.Close();
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        string pdfFilePath = "path/to/pdf/file.pdf";
        string outputFolderPath = "path/to/output/folder";

        PdfToImageConverter.ConvertToImage(pdfFilePath, outputFolderPath);
    }
}