C Simple Implementation of Sending E mail on Web Pages

2021-09-11 21:03:31
OfStack

1. The front-end HTML uses Jquery, so don't forget to introduce Jquery library if you do demonstration


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title></title>
  <script src="jquery-1.8.0.min.js" type="text/javascript"></script>
  <script type="text/javascript">
    function sendemail() {
      var smtp = $('#txtSmtp').val();
      var content = $('#txtContent').val();
      var title = $('#txtTitle').val();
      var from = $('#txtFrom').val();
      var to = $('#txtTo').val();
      $.post("Handler.ashx", { 'smtp': smtp, 'content': content,'title':title, 'from': from, 'to': to },
    function (data) {
      var n = eval('(' + data + ')');
      if (n.success) {
        alert(n.message);
      }
    });
    
    }
  </script>
</head>
<body>
  <table>
    <tr><td>smtp:</td>
      <td><input type="text" id = "txtSmtp" value="Smtp Server" />
      </td>
    </tr>
    
    <tr><td>from addr:</td>
      <td><input type="text" id = "txtFrom" value="xxx@xxx.com" />
      </td>
    </tr>

    <tr><td>to addr:</td>
      <td><input type="text" id = "txtTo" value="xxx@xxx.com" />
      </td>
    </tr>

    <tr><td>title:</td>
      <td><input type="text" id = "txtTitle" value="title" />
      </td>
    </tr>

    <tr><td>content:</td>
      <td><input type="text" id = "txtContent" value="Content" />
      
      </td>
    </tr>
    <tr>
      <td>
        <input type="button" id="btnSend" value="send" onclick="sendemail()"/>
      </td>
    </tr>
  </table>
</body>
</html>

2. The background code is a general processing class ashx, which can be called asynchronously in the foreground


<%@ WebHandler Language="C#" class="Handler" %>

using System;
using System.Web;
using Utility;
public class Handler : IHttpHandler {
  
  public void ProcessRequest (HttpContext context)
  {
    context.Response.ContentType = "text/plain";
    string smtp = HttpContext.Current.Request.Form["smtp"].ToString();
    string title = HttpContext.Current.Request.Form["title"].ToString();
    string content = HttpContext.Current.Request.Form["content"].ToString();
    string from = HttpContext.Current.Request.Form["from"].ToString();
    string to = HttpContext.Current.Request.Form["to"].ToString();
    
    
    try
    {
      EmailClient emailClient = new EmailClient(smtp);// localhost::25
      emailClient.SendEmail(from, to, title, content);
      System.Web.Script.Serialization.JavaScriptSerializer jss = new System.Web.Script.Serialization.JavaScriptSerializer();
      System.Collections.Generic.Dictionary<string, object> d = new System.Collections.Generic.Dictionary<string, object>();
      d.Add("message", "success");
      d.Add("success", true);
      context.Response.Write(jss.Serialize(d));
    }
    catch (Exception ex)
    {
      System.Web.Script.Serialization.JavaScriptSerializer jss = new System.Web.Script.Serialization.JavaScriptSerializer();
      System.Collections.Generic.Dictionary<string, object> d = new System.Collections.Generic.Dictionary<string, object>();
      d.Add("message", ex.Message);
      d.Add("success", true);
      context.Response.Write(jss.Serialize(d));
    }
    
      
  }
 
  public bool IsReusable {
    get {
      return false;
    }
  }

}

3. Finally, the SMTP helper class used


public class EmailClient
  {
    private string smtpServer;
    private string senderAddress;

    
    public EmailClient(string smtpServer)
    {
      this.smtpServer = smtpServer;
      this.senderAddress = string.Empty;
    }

  　　 public void SendEmail(string fromAddress, string toAddress, string subject, string messageBody)
    {
      SmtpClient smtp = new SmtpClient(smtpServer);

      MailMessage email = new MailMessage();

      email.From = new MailAddress(fromAddress);
      email.To.Add(toAddress);
      email.Subject = subject;
      email.Body = messageBody;

      smtp.Send(email);
    }

}