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ivan  
#1 Posted : Wednesday, April 13, 2011 5:25:28 AM(UTC)
ivan

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C#/CSharp Example

The following code demonstrates how to convert email to a HTML page and display it using Web browser in C#.

After the email was converted to HTML page, you can browse it with web browser. You can get everything in the HTML page such as From, To, Cc, Subject, Date, Attachments and Embedded images.

Code:

// The following example codes demonstrate converting email to HTML page
// To get full sample projects, please download and install EAGetMail on your machine.
// To run it correctly, please change email server, user, password, folder, file name value to yours

using System; 
using System.Collections; 
using System.Collections.Generic; 
using System.Text.RegularExpressions; 
using System.Text; 
using System.IO; 

// Add EAGetMail namespace
using EAGetMail; 

namespace receiveemail 
{ 
    class Program 
    { 
        private static void ConvertMailToHtml(string fileName) 
        { 
            try 
            { 
                int pos = fileName.LastIndexOf("."); 
                string mainName = fileName.Substring(0, pos); 
                string htmlName = mainName + ".htm"; 

                string tempFolder = mainName; 
                if (!File.Exists(htmlName)) 
                { 
                    // We haven't generate the html for this email, generate it now.
                    _GenerateHtmlForEmail(htmlName, fileName, tempFolder); 
                } 

                Console.WriteLine("Please open {0} to browse your email", 
                    htmlName); 
            } 
            catch (Exception ep) 
            { 
                Console.WriteLine(ep.Message); 
            } 
        } 

        private static string _FormatHtmlTag(string src) 
        { 
            src = src.Replace(">", ">"); 
            src = src.Replace("<", "&lt;"); 
            return src; 
        } 

        // We generate a html + attachment folder for every email, once the html is create,
        // next time we don't need to parse the email again.
        private static void _GenerateHtmlForEmail(string htmlName, string emlFile, 
                            string tempFolder) 
        { 
            Mail oMail = new Mail("TryIt"); 
            oMail.Load(emlFile, false); 

            if (oMail.IsEncrypted) 
            { 
                try 
                { 
                    // This email is encrypted, we decrypt it by user default certificate.
                    oMail = oMail.Decrypt(null); 
                } 
                catch (Exception ep) 
                { 
                    Console.WriteLine(ep.Message); 
                    oMail.Load(emlFile, false); 
                } 
            } 

            if (oMail.IsSigned) 
            { 
                try 
                { 
                    // This email is digital signed.
                    EAGetMail.Certificate cert = oMail.VerifySignature(); 
                    Console.WriteLine("This email contains a valid digital signature."); 
                } 
                catch (Exception ep) 
                { 
                    Console.WriteLine(ep.Message); 
                } 
            } 

            // Parse html body
            string html = oMail.HtmlBody; 
            StringBuilder hdr = new StringBuilder(); 

            // Parse sender
            hdr.Append("<font face=\"Courier New,Arial\" size=2>"); 
            hdr.Append("<b>From:</b> " + _FormatHtmlTag(oMail.From.ToString()) + "<br>"); 

            // Parse to
            MailAddress[] addrs = oMail.To; 
            int count = addrs.Length; 
            if (count > 0) 
            { 
                hdr.Append("<b>To:</b> "); 
                for (int i = 0; i < count; i++) 
                { 
                    hdr.Append(_FormatHtmlTag(addrs[i].ToString())); 
                    if (i < count - 1) 
                    { 
                        hdr.Append(";"); 
                    } 
                } 
                hdr.Append("<br>"); 
            } 

            // Parse cc
            addrs = oMail.Cc; 

            count = addrs.Length; 
            if (count > 0) 
            { 
                hdr.Append("<b>Cc:</b> "); 
                for (int i = 0; i < count; i++) 
                { 
                    hdr.Append(_FormatHtmlTag(addrs[i].ToString())); 
                    if (i < count - 1) 
                    { 
                        hdr.Append(";"); 
                    } 
                } 
                hdr.Append("<br>"); 
            } 

            hdr.Append(String.Format("<b>Subject:</b>{0}<br>\r\n", 
                _FormatHtmlTag(oMail.Subject))); 

            // Parse attachments and save to local folder
            Attachment[] atts = oMail.Attachments; 
            count = atts.Length; 
            if (count > 0) 
            { 
                if (!Directory.Exists(tempFolder)) 
                    Directory.CreateDirectory(tempFolder); 

                hdr.Append("<b>Attachments:</b>"); 
                for (int i = 0; i < count; i++) 
                { 
                    Attachment att = atts[i]; 

                    // this attachment is in OUTLOOK RTF format, decode it here.
                    if (String.Compare(att.Name, "winmail.dat") == 0) 
                    { 
                        Attachment[] tatts = null; 
                        try 
                        { 
                            tatts = Mail.ParseTNEF(att.Content, true); 
                        } 
                        catch (Exception ep) 
                        { 
                            Console.WriteLine(ep.Message); 
                            continue; 
                        } 

                        int y = tatts.Length; 
                        for (int x = 0; x < y; x++) 
                        { 
                            Attachment tatt = tatts[x]; 
                            string tattname = String.Format("{0}\\{1}", tempFolder, tatt.Name); 
                            tatt.SaveAs(tattname, true); 
                            hdr.Append( 
                            String.Format("<a href=\"{0}\" target=\"_blank\">{1}</a> ", 
                                tattname, tatt.Name)); 
                        } 
                        continue; 
                    } 

                    string attname = String.Format("{0}\\{1}", tempFolder, att.Name); 
                    att.SaveAs(attname, true); 
                    hdr.Append(String.Format("<a href=\"{0}\" target=\"_blank\">{1}</a> ", 
                            attname, att.Name)); 
                    if (att.ContentID.Length > 0) 
                    { 

                        // Show embedded images.
                        html = html.Replace("cid:" + att.ContentID, attname); 
                    } 
                    else if (String.Compare(att.ContentType, 0, "image/", 0, 
                                "image/".Length, true) == 0) 
                    { 

                        // show attached images.
                        html = html + String.Format("<hr><img src=\"{0}\">", attname); 
                    } 
                } 
            } 

            Regex reg = new Regex("(<meta[^>]*charset[ \t]*=[ \t\"]*)([^<> \r\n\"]*)", 
                RegexOptions.Multiline | RegexOptions.IgnoreCase); 
            html = reg.Replace(html, "$1utf-8"); 
            if (!reg.IsMatch(html)) 
            { 
                hdr.Insert(0, 
                    "<meta HTTP-EQUIV=\"Content-Type\" Content=\"text-html; charset=utf-8\">"); 
            } 

            // write html to file
            html = hdr.ToString() + "<hr>" + html; 
            FileStream fs = new FileStream(htmlName, FileMode.Create, 
                FileAccess.Write, FileShare.None); 

            byte[] data = System.Text.UTF8Encoding.UTF8.GetBytes(html); 
            fs.Write(data, 0, data.Length); 
            fs.Close(); 
            oMail.Clear(); 
        } 

        static void Main(string[] args) 
        { 
            ConvertMailToHtml( "c:\\my folder\\test.eml" ); 
        } 
    } 
} 

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If you have any comments or questions about above example codes, please add your comments here.
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