C # generates PDFs based on HTML

Using the Itextsharp control

Using system;using system.collections.generic;using system.web;using system.web.ui;using System.Web.UI.WebControls; Using itextsharp.text;using itextsharp.text.pdf;using system.io;using itextsharp.tool.xml;using System.Text;using System.net;namespace pdftools{public partial class CreatePdf:System.Web.UI.Page {string Inpath = SYSTEM.W Eb.        HttpContext.Current.Server.MapPath ("~/bin/temp.html"); protected void Page_Load (object sender, EventArgs e) {string path = System.Web.HttpContext.Current.Serv Er.            MapPath ("~/uploadpdf"); if (!            Directory.Exists (path)) directory.createdirectory (path);            WebClient WC = new WebClient (); Download the HTML string WC from the URL.            Encoding = System.Text.Encoding.UTF8;            String htmltext = Getwebcontent (); Byte[] Pdffile = this.            Converthtmltexttopdf (HTMLText);            String fileId = "/file_" + DateTime.Now.ToString ("YYYYMMDDHHMMSS") + ". pdf"; System.IO.File.WrIteallbytes (path + fileId, pdffile); }//<summary>//To determine if garbled///</summary>//<param name= "TXT" ></param&        Gt <returns></returns> public bool Ismessycode (string txt) {var bytes = Encoding.ut F8.            GetBytes (TXT); 239 191 189 for (var i = 0; i < bytes. Length; i++) {if (I < bytes.                    Length-3) if (bytes[i] = = 239 && bytes[i + 1] = = 191 && bytes[i + 2] = = 189)                    {return true;        }} return false; }///<summary>//For website content, including HTML+CSS+JS//</summary>//<returns>strin  G Returns Web information </returns> public string getwebcontent () {try {WebClient                Mywebclient = new WebClient (); Mywebclient.credentials = credentialcache.defaultcredentials;                Gets or sets the network credential used to authenticate requests to Internet resources byte[] Pagedata = Mywebclient.downloaddata (Inpath);                Download data from the specified Web site string pagehtml = Encoding.UTF8.GetString (pagedata); If the Get Site page uses GB2312, then use this bool Isbool = Ismessycode (pagehtml);//determine which encoding to use to read the Web page information if (                    !isbool) {String pageHtml1 = Encoding.UTF8.GetString (pagedata);                pagehtml = PAGEHTML1;                    } else {string pageHtml2 = Encoding.Default.GetString (pagedata);                pagehtml = PAGEHTML2;            } return pagehtml;                } catch (WebException webEx) {Console.WriteLine (webEx.Message.ToString ());            return webex.message; }}///<summary>//Export HTML text to PDF file///</summary>//<param name= "HTMLText" ></param>//<returns></returns> Public byte[] Converthtmltexttopdf (string htmltext) {if (string.            IsNullOrEmpty (HTMLText)) {return null; }//Avoid htmltext when the text is not in any HTML tag tag, the PDF will be dropped, so add <p> tag htmltext = "<p>" + HTMLText + "&L            T;/p> "; MemoryStream outputstream = new MemoryStream ()//to which stream the PDF is to be written byte[] data = Encoding.UTF8.GetBytes (htmltext);//Word            String turn into byte[] MemoryStream msinput = new MemoryStream (data); Document doc = new document ();//To write a PDF file, the constructor is not filled with the pre-set straight A4 PDFWriter writer = pdfwriter.getinstance (doc, Outputstre            AM); Specifies that the file preset is scaled to 100% pdfdestination pdfdest = new Pdfdestination (pdfdestination.xyz, 0, Doc.            Pagesize.height, 1f); Open the document file doc.            Open (); Use Xmlworkerhelper to parse HTML into PDF file// Xmlworkerhelper.getinstance ().            Parsexhtml (writer, doc, msinput, NULL, Encoding.UTF8, New Unicodefontfactory ()); Xmlworkerhelper.getinstance ().            Parsexhtml (writer, doc, msinput, NULL, ENCODING.UTF8);            Write the information pdfdest set to PDF file Pdfaction action = pdfaction.gotolocalpage (1, pdfdest, writer); Writer.            Setopenaction (action); Doc.            Close ();            Msinput.close ();            Outputstream.close ();        Return the PDF file to Outputstream.toarray (); }//Set font class public class Unicodefontfactory:fontfactoryimp {private static readonly Strin G Arialfontpath = Path.Combine (Environment.getfolderpath (Environment.SpecialFolder.Fonts), "Arialuni.ttf");//arial            Unicode MS is the complete Unicode font.            private static readonly string marked in italics Path = Path.Combine (Environment.getfolderpath (Environment.SpecialFolder.Fonts), "Kaiu. TTF ");//Standard italic public override Font GetFont (string fontname, string enCoding, bool embedded, float size, int style, Basecolor color, bool cached) {Basefont bfchiness = Basefont.createfont (@ "C:\Windows\Fonts\SIMSUN.                ttc,1 ", Basefont.identity_h, basefont.not_embedded); Use Arial or superscript italic, choose a basefont Basefont = Basefont.createfont (marked in italics path, Basefont.identity_h, basefont.embedded                );            return new Font (bfchiness, size, style, color); }        }    }}

C # generates PDFs based on HTML