C# PDF打印

C#中使用iTextSharp生成並下載PDF很方便。

首先要將iTextSharp的dll下載並引入項目

主要分紅兩部分，一部分是PDF的Document生成,另外一部分就是將Document輸出到頁面

這裏分別列出aspx頁和MVC中ActionResult的下載方式

①aspx

工具類(只是提供Document的輸出)

using System.Web;
using iTextSharp.text;
using System.IO;
using iTextSharp.text.pdf;

namespace Common
{
    public class PdfHelper
    {
        public event DocRenderHandler DocRenderEvent;
        public delegate void DocRenderHandler(ref Document Doc);

        public void DownLoadPDF(string FileName, HttpContext context)
        {
            Document Doc = new Document();
            HttpResponse Response = context.Response;

            using (MemoryStream Memory = new MemoryStream())
            {
                PdfWriter PdfWriter = PdfWriter.GetInstance(Doc, Memory);
                if (DocRenderEvent != null)
                    DocRenderEvent(ref Doc);

                #region 文件輸出及相關設置
                Response.Clear();
                Response.Cache.SetCacheability(HttpCacheability.NoCache);
                Response.AddHeader("Content-Disposition", "attachment;filename=" + FileName);
                Response.ContentType = "application/pdf";
                Response.OutputStream.Write(Memory.GetBuffer(), 0, Memory.GetBuffer().Length);
                Response.OutputStream.Flush();
                Response.OutputStream.Close();
                Response.Flush();
                #endregion
            }
            Response.End();
        }
    }
}

下載頁面

using System;
using iTextSharp.text;
using iTextSharp.text.pdf;
using System.Text;

namespace MvcMovie.Common
{
    public partial class PdfLoad : System.Web.UI.Page
    {
        
        protected void Page_Load(object sender, EventArgs e)
        {
            string FileName = DateTime.Now.ToShortTimeString() + ".pdf";
            PdfHelper ph = new PdfHelper();
            ph.DocRenderEvent += RenderPdfDoc;
            ph.DownLoadPDF(FileName, this.Context);
        }

        private void RenderPdfDoc(ref Document Doc)
        {
            Doc.SetPageSize(PageSize.A4);
            Doc.SetMargins(60, 60, 20, 40);

            #region 相關元素準備
            BaseFont bfChinese = BaseFont.CreateFont(@"C:\windows\fonts\simsun.ttc,1", BaseFont.IDENTITY_H,
                BaseFont.NOT_EMBEDDED);
            Font Font16 = new Font(bfChinese, 16);
            Font Font14 = new Font(bfChinese, 14);
            Font Font12 = new Font(bfChinese, 12);
            Font Font12Bold = new Font(bfChinese, 12, Font.BOLD);
            Font Font12Italic = new Font(bfChinese, 12, Font.BOLDITALIC);
            Font Font10Bold = new Font(bfChinese, 10, Font.BOLD);

            Paragraph parag;
            Chunk chunk;
            PdfPTable table;
            #endregion
            
            #region 文件標題
            Doc.Open();
            Doc.AddAuthor("TiestoRay");
            Doc.AddTitle("相關部分發布的重要通知");
            #endregion
            
            #region 正文
            parag = new Paragraph("------通知------", Font16);
            parag.Alignment = Element.ALIGN_CENTER;
            Doc.Add(parag);

            parag = new Paragraph();
            parag.SetLeading(20f, 1f);
            parag.Add(new Chunk("曾經滄海難爲水，心有靈犀一點通", Font12Italic));
            Doc.Add(parag);

            parag = new Paragraph();
            parag.Add(new Chunk("取次花叢懶回顧，得來全不費工夫", Font10Bold));
            Doc.Add(parag);

            parag = new Paragraph();
            parag.Add(new Chunk("      " + DateTime.Now.ToLongDateString(), Font12));
            Doc.Add(parag);

            parag = new Paragraph();
            parag.SetLeading(1f, 1f);
            chunk = new Chunk(new StringBuilder().Insert(0, " ", 30).Append("Come On!").ToString(), Font12);
            chunk.SetUnderline(-18f, 1.4f);
            parag.Add(chunk);
            parag.Alignment = Element.ALIGN_JUSTIFIED_ALL;
            Doc.Add(parag);
            
            Doc.NewPage();//換頁

            table = new PdfPTable(new float[] { 5, 3, 3 });
            table.WidthPercentage = 100f;
            table.AddCell(new Phrase("英語老師簽字：\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n", Font12));
            table.AddCell(new Phrase("同桌簽字：", Font12));
            table.AddCell(new Phrase("本人簽字：", Font12));
            Doc.Add(table);

            parag = new Paragraph();
            parag.SetLeading(-30f, 1.4f);
            parag.Add(new Chunk(new StringBuilder().Insert(0, " ", 60).ToString() + "簽字日期：", Font12));
            Doc.Add(parag);
            Doc.Close();
            #endregion
        }
    }
}

②MVC3(以上)版本
寫一個繼承自ActionResult的Result類，而且將Document輸出寫到ExecuteResult中

using System.Web;
using System.Web.Mvc;
using iTextSharp.text;
using System.IO;
using iTextSharp.text.pdf;

namespace Common
{
    public class PdfResult:ActionResult
    {
        private string FileName;
        public event DocRenderHandler DocRenderEvent;
        public delegate void DocRenderHandler(ref Document Doc);

        public PdfResult(string FileName)
        {
            this.FileName = FileName;
        }

        /// <summary>
        /// 向頁面輸出時纔會執行該方法
        /// </summary>
        public override void ExecuteResult(ControllerContext context)
        {
            Document Doc = new Document();
            using (MemoryStream Memory = new MemoryStream())
            {
                PdfWriter PdfWriter = PdfWriter.GetInstance(Doc, Memory);
                if (DocRenderEvent != null)
                    DocRenderEvent(ref Doc);
                
                #region 文件輸出及相關設置
                HttpResponseBase Response = context.HttpContext.Response;
                Response.Clear();
                Response.Cache.SetCacheability(HttpCacheability.NoCache);
                Response.AddHeader("Content-Disposition", "attachment;filename=" + FileName);
                Response.ContentType = "application/pdf";
                Response.OutputStream.Write(Memory.GetBuffer(), 0, Memory.GetBuffer().Length);
                Response.OutputStream.Flush();
                Response.OutputStream.Close();
                Response.Flush();
                #endregion
            }
            context.HttpContext.Response.End();
        }
    }
}

②調用

using System;
using System.Web.Mvc;
using MvcMovie.Common;
using iTextSharp.text;
using iTextSharp.text.pdf;
using System.Text;

namespace MvcMovie.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index(string name,int? id)
        {
            ViewBag.Message = "歡迎使用 ASP.NET MVC!";
            return View();
        }


        public ViewResult About()
        {
            return View("About");
        }

        public ActionResult DownLoadPdf(int ID)
        {
            string FileName = DateTime.Now.ToShortTimeString()+".pdf";
            PdfResult pr = new PdfResult(FileName);
            pr.DocRenderEvent += RenderPdfDoc;
            return pr;
        }
        
        private void RenderPdfDoc(ref Document Doc)
        {
            //TO DO
            //內容同上
        }
    }
}