[C#/WINFORM] 이미지를 PDF 파일로 저장하기

using System;
using System.Drawing;
using System.Windows.Forms;

using PdfSharp.Drawing;
using PdfSharp.Pdf;

#region 이미지를 PDF 파일로 저장하기 - SavePDFFile(sourceImage, targetPDFFilePath)

/// <summary>
/// 이미지를 PDF 파일로 저장하기
/// </summary>
/// <param name="sourceImage">소스 이미지</param>
/// <param name="targetPDFFilePath">타겟 PDF 파일 경로</param>
/// <returns>처리 결과</returns>
public void SavePDFFile(Image sourceImage, string targetPDFFilePath)
{
    PdfDocument pdfDocument = null;

    try
    {
        pdfDocument = new PdfDocument();

        double sourceImageWidth  = (sourceImage.Width  / 96d) * 72d;
        double sourceImageHeight = (sourceImage.Height / 96d) * 72d;

        int pageHeight = (int)((842d / 72d) * 96d);
        int pageCount  = (int)Math.Ceiling(sourceImageHeight / 842d);

        for(int i = 0; i < pageCount; i++)
        {
            Bitmap   pageBitmap   = new Bitmap(sourceImage.Width, pageHeight);
            Graphics pageGraphics = Graphics.FromImage(pageBitmap);

            pageGraphics.DrawImage
            (
                sourceImage,
                new Rectangle(0, 0, sourceImage.Width, pageHeight), 
                new Rectangle(0, i * pageHeight, sourceImage.Width, pageHeight),
                GraphicsUnit.Pixel
            );

            PdfPage pdfPage = new PdfPage();

            pdfPage.Width = XUnit.FromPoint(sourceImageWidth);

            pdfDocument.AddPage(pdfPage);

            XImage    xImage    = XImage.FromGdiPlusImage(pageBitmap);
            XGraphics xGraphics = XGraphics.FromPdfPage(pdfPage);

            xGraphics.DrawImage(xImage, 0, 0);
        }

        pdfDocument.Save(targetPDFFilePath);
    }
    finally
    {
        if(pdfDocument != null)
        {
            pdfDocument.Clone();
        }
    }
}

#endregion