使用基于lastwriteaccess的itextsharp将多个tiff合并为一个pdf

using iTextSharp.text;
using iTextSharp.text.pdf;

// 创建一个新的PDF文档
Document document = new Document();
PdfWriter writer = PdfWriter.GetInstance(document, new FileStream("output.pdf", FileMode.Create));
document.Open();

using System.Drawing;
using System.Drawing.Imaging;

// 读取Tiff文件并将其添加到PDF文档中
string[] tiffFiles = { "file1.tif", "file2.tif", "file3.tif" };
foreach (string tiffFile in tiffFiles)
{
    // 读取Tiff文件
    using (Bitmap bitmap = new Bitmap(tiffFile))
    {
        // 将Tiff文件转换为PDF页面
        iTextSharp.text.Image image = iTextSharp.text.Image.GetInstance(bitmap, ImageFormat.Tiff);
        image.ScaleToFit(document.PageSize.Width, document.PageSize.Height);
        image.Alignment = iTextSharp.text.Image.ALIGN_CENTER;

        // 添加PDF页面到文档
        document.Add(image);
    }
}

// 关闭PDF文档
document.Close();