PM> Install-Package Spire.PDF

using Spire.Pdf;
using Spire.Pdf.Graphics;
using System.Drawing;

namespace ConvertMultipleImagesIntoPdf
{
    class Program
    {
        static void Main(string[] args)
        {
            //創(chuàng)建 PdfDocument 對(duì)象
            PdfDocument doc = new PdfDocument();

            //將頁(yè)面邊距設(shè)置為 0
            doc.PageSettings.SetMargins(0);

            //獲取存儲(chǔ)圖片的文件夾
            DirectoryInfo folder = new DirectoryInfo(@"C:\Users\Administrator\Desktop\Images");

            //遍歷文件夾中的所有文件
            foreach (FileInfo file in folder.GetFiles())
            {
                //加載當(dāng)前圖片
                Image image = Image.FromFile(file.FullName);

                //獲取圖片寬度和高度
                float width = image.PhysicalDimension.Width;
                float height = image.PhysicalDimension.Height;

                //添加一個(gè)與圖片尺寸相同的頁(yè)面
                PdfPageBase page = doc.Pages.Add(new SizeF(width, height));

                //根據(jù)圖片創(chuàng)建 PdfImage 對(duì)象
                PdfImage pdfImage = PdfImage.FromImage(image);

                //將圖片繪制到頁(yè)面左上角 (0, 0) 位置
                page.Canvas.DrawImage(pdfImage, 0, 0, pdfImage.Width, pdfImage.Height);
            }
      
            //保存文檔
            doc.SaveToFile("CombinaImagesToPdf.pdf");
            doc.Dispose();
        }
    }
}