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asp calls a DLL written in C# to send emails

Author：Eve Cole Update Time：2009-06-23 17:00:02

I have always wanted to write a server component that can send emails using ASP, but using VC is too troublesome and I have never been able to do it.

 

I read an article two days ago about how ASP can call a DLL written in C#. I tried it and it worked. I'm very happy. Now it's easier to write something to send emails.

 

Haha, it’s very simple. It’ll be done in a moment. I don’t dare to keep it to myself. Let’s take a look at the code first:

 

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  1. using System;
  2. using System.Net.Mail;

  • using System.Text;
  •   
  • namespaceIMELS​
  • {
  •      public   class SendMail
  • {
  •          public SendMail() { }
  •   
  •          private   string _to = string .Empty;
  •   
  •          /// <summary>   
  •          /// Recipient address, multiple separated by ","   
  •          /// </summary>   
  •          public   string To
  • {
  •              set { _to = value; }
  • }
  •   
  •          private   string _from = string .Empty;
  •   
  •          /// <summary>   
  •          /// Sender address   
  •          /// </summary>   
  •          public   string From
  • {
  •              set { _from = value; }
  • }
  •   
  •          private   string _fromName = string .Empty;
  •   
  •          /// <summary>   
  •          /// Sender display name   
  •          /// </summary>   
  •          public   string FromName
  • {
  •              set { _fromName = value; }
  • }
  •   
  •          private   string _cc = string .Empty;
  •   
  •          /// <summary>   
  •          /// CC, separate multiple copies with ","   
  •          /// </summary>   
  •          public   string CC
  • {
  •              set { _cc = value; }
  • }
  •   
  •          private   string _bcc = string .Empty;
  •   
  •          /// <summary>   
  •          /// Secret copy, multiple separated by ","   
  •          /// </summary>   
  •          public   string BCC
  • {
  •              set { _bcc = value; }
  • }
  •   
  •          private   string _charset = "GB2312" ;
  •   
  •          /// <summary>   
  •          /// Encoding of the email body   
  •          /// </summary>   
  •          public   string Charset
  • {
  •              set { _charset = value; }
  • }
  •   
  •          private   string _contentType = "html" ;
  •          /// <summary>   
  •          /// Email format (html or txt)   
  •          /// </summary>   
  •          public   string ContentType
  • {
  •              set { _contentType = value; }
  • }
  •   
  •          private   string _subject = string .Empty;
  •          /// <summary>   
  •          /// Email title   
  •          /// </summary>   
  •          public   string Subject
  • {
  •              set { _subject = value; }
  • }
  •   
  •          private   string _body = string .Empty;
  •          /// <summary>   
  •          /// Email content   
  •          /// </summary>   
  •          public   stringBody​
  • {
  •              set { _body = value; }
  • }
  •   
  •          private   string _smtp;
  •          /// <summary>   
  •          /// SMTP server address   
  •          /// </summary>   
  •          public   string Smtp
  • {
  •              set { _smtp = value; }
  • }
  •   
  •          private   string _username;
  •          /// <summary>   
  •          /// SMTP username   
  •          /// </summary>   
  •          public   string Username
  • {
  •              set { _username = value; }
  • }
  •          /// <summary>   
  •          /// SMTP password   
  •          /// </summary>   
  •          private   string _password;
  •   
  •          public   string Password
  • {
  •              set { _password = value; }
  • }
  •   
  •          private   int _port = 25;
  •          /// <summary>   
  •          /// SMTP products   
  •          /// </summary>   
  •          public   int Port
  • {
  •              set { _port = value; }
  • }
  •   
  •          /// <summary>   
  •          /// send   
  •          /// </summary>   
  •          public   void Send()
  • {
  • MailAddress from = new MailAddress(_from, _fromName);
  • MailMessage message = new MailMessage();
  • message.From = from;
  •                
  •              string [] toadd = _to.Split( ',' );
  •              foreach ( string _add in toadd)
  • {
  •                  try   
  • {
  • message.To.Add( new MailAddress(_add));
  • }
  •                  catch (Exception e)
  • {
  • _error += "To Address Error : " + e.Message + "(" + _add + ");" ;
  • }
  • }
  •   
  •              if (_cc != string .Empty)
  • {
  •   
  •                  string [] ccadd = _cc.Split( ',' );
  •   
  •                  foreach ( string _add in ccadd)
  • {
  •                      try   
  • {
  • message.CC.Add( new MailAddress(_add));
  • }
  •                      catch (Exception e)
  • {
  • _error += "CC Address Error : " + e.Message + "(" + _add + ");" ;
  • }
  • }
  • }
  •              if (_bcc != string .Empty)
  • {
  •                  string [] bccadd = _bcc.Split( ',' );
  •   
  •                  foreach ( string _add in bccadd)
  • {
  •                      try   
  • {
  • message.Bcc.Add( new MailAddress(_add));
  • }
  •                      catch (Exception e)
  • {
  • _error += "BCC Address Error : " + e.Message + "(" + _add + ");" ;
  • }
  • }
  • }
  •   
  • message.Sender = from;
  • message.Subject = _subject;
  • message.Body = _body;
  •   
  •              if (_contentType == "html" || _contentType == string .Empty)
  • {
  • message.IsBodyHtml = true ;
  • }
  •              else   
  • {
  • message.IsBodyHtml = false ;
  • }
  •   
  • message.BodyEncoding = Encoding.GetEncoding(_charset);
  • message.DeliveryNotificationOptions = DeliveryNotificationOptions.None;
  • SmtpClient __smtp = new SmtpClient();
  • __smtp.Host = _smtp;
  • __smtp.Port = _port;
  • __smtp.UseDefaultCredentials = false ;
  • __smtp.Credentials = new System.Net.NetworkCredential(_username, _password);
  • __smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
  •              try   
  • {
  • __smtp.Send(message);
  • }
  •              catch (SmtpException e)
  • {
  • _error += "SMTP Error:" + e.Message + ";" ;
  • }
  •                
  • }
  •   
  •          private   string _error = string .Empty;
  •          /// <summary>   
  •          /// Return error message   
  •          /// </summary>   
  •          public   string error
  • {
  •              get { return _error; }
  • }
  •          /// <summary>   
  •          /// Clear error information   
  •          /// </summary>   
  •          public   void ClearErr()
  • {
  • _error = string .Empty;
  • }
  • }
  • }

    • Let’s talk about the specific implementation process:

    1. First create a new class library project; open the project property page, set the assembly name to "IMELS" on the "Application" tab (of course, you can set this to a name you like), and the output type is class library, as shown in the figure :

    Click "Assembly Information" and check "Make assembly COM visible", as shown in the figure:

    2. On the "Signature" tab, check "Sign the program", as shown in the figure:

    Then select the key file in the "Select strong name key file" drop-down list. If there is no key file, select "New". Here I select New, as shown in the figure:

    Enter the name of the key in the "Key file name" field. You can choose to add a password to the key to protect it. I did not use a password here.

    Then add a class "SendMail" to the project, and the code is as above.

    3. After the code is completed, generate the DLL file and put the DLL on the D: disk or other disk, but it is best not to put it on the system disk, and then register it. You cannot use regsvr32 to register a DLL written in C#. You must use regsvr32. regasm, the format is: regasm /codebase d:DLLIMELS.dll.

    In this way, the writing and registration of the DLL have been completed. The following is the application. The calling method in asp is as follows:

    view plain copy to clipboard print ?
    1. <%
    2. dim send
    3. set send = Server.CreateObject( "IMELS.SendMail" )
    4.   
    5. send.From = "[email protected]"   
    6. send.FromName = "无question"   
    7. send.Smtp = "smtp.163.com"   
    8. send.Username = "Username"   
    9. send.Password = "Password"   
    10. send.Subject = "asp calls the DLL written in C# to send the email test title"   
    11. send.ContentType = "html"   
    12. send.Charset = "gb2312"   
    13. send.Body = "asp calls the DLL written in C# to send the email test body"   
    14. send. To = "[email protected]"   
    15. send.CC = "CC address"   
    16. send.BCC = "Bcc address"   
    17. send.Send()
    18. Response.Write( send.Error )
    19. %>

    Okay, you're done! !

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