How to convert RTF to HTML email with images and send using SmtpClient in C# and .NET
Complete code
GitHubusing System;
using System.IO;
using System.Net;
using System.Net.Mail;
using System.Drawing;
using System.Collections.Generic;
namespace Sample
{
class Program
{
static void Main(string[] args)
{
string rtfFile = Path.GetFullPath(@"..\..\images.rtf");
// 1. Convert RTF to HTML and place all images to list
string rtfString = File.ReadAllText(rtfFile);
SautinSoft.RtfToHtml r = new SautinSoft.RtfToHtml();
r.ImageStyle.IncludeImageInHtml = false;
List<SautinSoft.RtfToHtml.SautinImage> imageList = new List<SautinSoft.RtfToHtml.SautinImage>();
// 2. After launching this method we'll get our RTF document in HTML format
// and list of all images.
r.OpenRtf(rtfString);
string htmlString = String.Empty;
r.ToHtml(out htmlString, imageList);
// 3. Create HTML email
string from = "bob@bobsite.com";
string to = "john@johnsite.com";
string subject = "This is a testing email from Bob to John using SmtpClient";
MailMessage emailMessage = new MailMessage();
emailMessage.From = new MailAddress(from);
emailMessage.To.Add(to);
emailMessage.Subject = subject.Replace("\r\n", "");
// 4. Attach images to email
System.Net.Mail.AlternateView altView = AlternateView.CreateAlternateViewFromString(htmlString, null, "text/html");
foreach (SautinSoft.RtfToHtml.SautinImage simg in imageList)
{
if (simg.Img != null)
{
LinkedResource lr = null;
System.IO.MemoryStream ms = new System.IO.MemoryStream();
simg.Img.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
if (ms != null && ms.Position > 0)
ms.Position = 0;
lr = new LinkedResource(ms);
lr.ContentId = simg.Cid;
altView.LinkedResources.Add(lr);
}
}
emailMessage.AlternateViews.Add(altView);
// 5. Send the message using email account
string userName = "bobuser";
string userPassword = "bobpassword";
SmtpClient client = new SmtpClient();
client.Port = 25;
client.DeliveryMethod = SmtpDeliveryMethod.Network;
//client.UseDefaultCredentials = false;
// Some smtp servers doesn't require credentials, therefore
// you may set: client.UseDefaultCredentials = false;
// and remove the line: client.Credentials = new NetworkCredential(userName, userPassword);
client.Credentials = new NetworkCredential(userName, userPassword);
client.Host = "smtpout.bobsite.com";
// In the real example in case of the correct host, uncomment the line below:
//client.Send(emailMessage);
Console.WriteLine("The message has been sent!");
Console.ReadKey();
}
}
}
Imports Microsoft.VisualBasic
Imports System
Imports System.IO
Imports System.Net
Imports System.Net.Mail
Imports System.Drawing
Imports System.Collections.Generic
Namespace Sample
Friend Class Program
Shared Sub Main(ByVal args() As String)
Dim rtfFile As String = Path.GetFullPath("..\..\images.rtf")
' 1. Convert RTF to HTML and place all images to list
Dim rtfString As String = File.ReadAllText(rtfFile)
Dim r As New SautinSoft.RtfToHtml()
r.ImageStyle.IncludeImageInHtml = False
Dim imageList As New List(Of SautinSoft.RtfToHtml.SautinImage)()
' 2. After launching this method we'll get our RTF document in HTML format
' and list of all images.
r.OpenRtf(rtfString)
Dim htmlString As String = String.Empty
r.ToHtml(htmlString, imageList)
' 3. Create HTML email
Dim from As String = "bob@bobsite.com"
Dim [to] As String = "john@johnsite.com"
Dim subject As String = "This is a testing email from Bob to John using SmtpClient"
Dim emailMessage As New MailMessage()
emailMessage.From = New MailAddress(from)
emailMessage.To.Add([to])
emailMessage.Subject = subject.Replace(vbCrLf, "")
' 4. Attach images to email
Dim altView As System.Net.Mail.AlternateView = AlternateView.CreateAlternateViewFromString(htmlString, Nothing, "text/html")
For Each simg As SautinSoft.RtfToHtml.SautinImage In imageList
If simg.Img IsNot Nothing Then
Dim lr As LinkedResource = Nothing
Dim ms As New System.IO.MemoryStream()
simg.Img.Save(ms, System.Drawing.Imaging.ImageFormat.Png)
If ms IsNot Nothing AndAlso ms.Position > 0 Then
ms.Position = 0
End If
lr = New LinkedResource(ms)
lr.ContentId = simg.Cid
altView.LinkedResources.Add(lr)
End If
Next simg
emailMessage.AlternateViews.Add(altView)
' 5. Send the message using email account
Dim userName As String = "bobuser"
Dim userPassword As String = "bobpassword"
Dim client As New SmtpClient()
client.Port = 25
client.DeliveryMethod = SmtpDeliveryMethod.Network
'client.UseDefaultCredentials = false;
' Some smtp servers doesn't require credentials, therefore
' you may set: client.UseDefaultCredentials = false;
' and remove the line: client.Credentials = new NetworkCredential(userName, userPassword);
client.Credentials = New NetworkCredential(userName, userPassword)
client.Host = "smtpout.bobsite.com"
' In the real example in case of the correct host, uncomment the line below:
'client.Send(emailMessage);
Console.WriteLine("The message has been sent!")
Console.ReadKey()
End Sub
End Class
End Namespace
If you are looking also for a .Net solution to Create or Modify HTML documents, see our Document .Net.
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