需先引用 itextsharp.dll

//方法一 /// <summary>/// JPG轉PDF/// </summary>/// <param name="jpgfile">圖片路徑</param>/// <param name="pdf">生成的PDF路徑</param>/// <param name="pageSize">A4，A5</param>/// <param name="Vertical">T:縱向，F橫向</param>public void ConvertJPG2PDF(string jpgfile, string pdf, string pageSize, bool Vertical = true){float width = 0, height = 0;Document document;#region 根據紙張大小，縱橫向，設置畫布長寬if (pageSize.ToUpper() == "A4"){if (Vertical)//縱向{width = iTextSharp.text.PageSize.A4.Width;height = iTextSharp.text.PageSize.A4.Height;}else//橫向{width = iTextSharp.text.PageSize.A4.Height;height = iTextSharp.text.PageSize.A4.Width;}}else if (pageSize.ToUpper() == "A5"){if (Vertical){width = iTextSharp.text.PageSize.A5.Width;height = iTextSharp.text.PageSize.A5.Height;}else{width = iTextSharp.text.PageSize.A5.Height;height = iTextSharp.text.PageSize.A5.Width;}}iTextSharp.text.Rectangle pageSizeNew = new iTextSharp.text.Rectangle(width, height);document = new Document(pageSizeNew);#endregion using (var stream = new FileStream(pdf, FileMode.Create, FileAccess.Write, FileShare.None)){PdfWriter.GetInstance(document, stream);document.Open();using (var imageStream = new FileStream(jpgfile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)){var image = iTextSharp.text.Image.GetInstance(imageStream);//縮放圖像比例image.ScaleToFit(width, height);image.SetAbsolutePosition(0, 0);image.Alignment = iTextSharp.text.Image.ALIGN_MIDDLE;document.Add(image);}document.Close();}} //方法二 /// <summary>/// jpg轉PDF/// </summary>/// <param name="pdfPath">pdf存放路徑</param>/// <param name="jpegPath">jpg路徑</param>/// <returns></returns>private bool jpegTopdf(string pdfPath, string jpegPath){try{System.Drawing.Image B = System.Drawing.Image.FromFile(jpegPath);System.Drawing.Bitmap image = new System.Drawing.Bitmap(B);B.Dispose();Document document = new Document();//document.SetPageSize(new iTextSharp.text.Rectangle(image.Width + 72f, image.Height + 72f));document.SetPageSize(new iTextSharp.text.Rectangle(image.Width, image.Height));PdfWriter write = PdfWriter.GetInstance(document, new FileStream(pdfPath, FileMode.OpenOrCreate, FileAccess.Write));document.Open();iTextSharp.text.Image jpg;jpg = iTextSharp.text.Image.GetInstance(image, ImageFormat.Jpeg);document.NewPage();document.Add(jpg);if (document != null && document.IsOpen()){document.Close();}if (write != null){write.Close();}return true;}catch (Exception ex){return false;}}

總結

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