NET で複数の PDF からすべての画像を抽出する方法

using Aspose.Pdf.Plugins;
using System.IO;

string inputDir = @"C:\Assets\InputPDFs";
string outputBaseDir = @"C:\Assets\ExtractedImages";

string[] pdfFiles = Directory.GetFiles(inputDir, "*.pdf");

foreach (var pdfFile in pdfFiles)
{
    // Optionally create a unique folder for each PDF
    string pdfName = Path.GetFileNameWithoutExtension(pdfFile);
    string imageOutputDir = Path.Combine(outputBaseDir, pdfName);
    Directory.CreateDirectory(imageOutputDir);

    // Configure extractor
    var extractor = new ImageExtractor();
    var options = new ImageExtractorOptions();
    options.AddInput(new FileDataSource(pdfFile));

    // Process extraction
    var resultContainer = extractor.Process(options);
    int imageIndex = 0;
    foreach (var imageResult in resultContainer.ResultCollection)
    {
        string imgPath = Path.Combine(imageOutputDir, $"img_{++imageIndex}.png");
        File.WriteAllBytes(imgPath, imageResult.ToFile());
    }
    Console.WriteLine($"Extracted {imageIndex} images from {pdfName}");
}