如何在 C# 中将非 mime 消息转换为 mime 邮件消息

Posted 2023-03-15

【中文标题】如何在 C# 中将非 mime 消息转换为 mime 邮件消息

【英文标题】：how to convert non-mime message to mime mail message in c#

【发布时间】：2013-07-12 20:09:58

【问题描述】：

我收到一封不是 MIME 邮件的邮件 无法获取 Content-Type

无法获取附件

如何将此消息转换为 MIME 消息

foreach (AE.Net.Mail.Lazy<MailMessage> message in messages)
                
                    MailMessage m = message.Value;
                    string sender = m.From.Address;
                    ICollection<Attachment> cc = m.Attachments;
                    foreach (Attachment aa in cc)
                    
                        System.IO.File.WriteAllBytes(@"C:\Users\LAB-User2\Desktop\EmailAttachments\" + aa.Filename, aa.GetData());
                    

                

更新

此配置是否适用于非 mime 消息？

public string GetDisposition()
    
        return this["Content-Disposition"]["boundary"];
    


string disposition = Headers.GetDisposition();
        if (!string.IsNullOrEmpty(disposition))
        
            //else this is a multipart Mime Message
            using (var subreader = new StringReader(line + Environment.NewLine + reader.ReadToEnd()))
                ParseMime(subreader, disposition);
        
        else
        
            //SetBody((line + Environment.NewLine + reader.ReadToEnd()).Trim());
        

我可以向自己发送非 mime 电子邮件吗？这样我就可以收到 MIME 格式的电子邮件了？ 当我尝试这个时，我无法给自己发电子邮件

ImapClient imap = new ImapClient("imap.gmail.com", "[e-mail]", "pwd", ImapClient.AuthMethods.Login, 993, true, true);
                //imap.Connect("imap.gmail.com", 993, true, true);
                imap.SelectMailbox("INBOX");


                //MailMessage[] mm = imap.GetMessages(imap.GetMessageCount() - 1, imap.GetMessageCount() - 10, false, false);

                AE.Net.Mail.Lazy<AE.Net.Mail.MailMessage>[] messages = imap.SearchMessages(SearchCondition.Unseen(), false);

                // Run through each message:
                foreach (AE.Net.Mail.Lazy<AE.Net.Mail.MailMessage> message in messages)
                
                    AE.Net.Mail.MailMessage mm = message.Value;

                    //create the mail message
                    //var mail = new MailMessage();

                    var mail = new System.Net.Mail.MailMessage();

                    //set the addresses
                    mail.From = new MailAddress("[e-mail]", "demo");
                    mail.To.Add("[e-mail]");

                    //set the content
                    mail.Subject = "This is an email";

                    //first we create the Plain Text part
                    //var plainView = AlternateView.CreateAlternateViewFromString("This is my plain text content, viewable by those clients that don't support html", null, "text/plain");
                    //then we create the Html part
                    //var htmlView = AlternateView.CreateAlternateViewFromString("<b>this is bold text, and viewable by those mail clients that support html</b>", null, "text/html");

                    ICollection<AE.Net.Mail.Attachment> cc = mm.AlternateViews;
                    foreach (AE.Net.Mail.Attachment aa in cc)
                    
                        try
                        
                            System.IO.File.WriteAllBytes(@"C:\Users\LAB-User2\Desktop\EmailAttachments\" + aa.Filename, aa.GetData());
                        
                        catch (Exception ex)
                        
                            Console.WriteLine(ex.Message);
                        
                        //mail.AlternateViews.Add(b);
                    
                    var plainView = AlternateView.CreateAlternateViewFromString(mm.Raw, null, "text/plain");

                    mail.AlternateViews.Add(plainView);

                    //send the message
                    var smtp = new SmtpClient("smtp.gmail.com", 587); //specify the mail server address
                    smtp.Credentials = new System.Net.NetworkCredential("[e-mail]", "pwd");
                    smtp.EnableSsl = true;
                    smtp.Send(mail);
                    smtp = null;
                    mail.Dispose();

【问题讨论】：

***.com/q/1000954/34397

是否使用替代视图可以获取附件？

我更新了我的问题，处置是否适用于非 mime 消息？我不明白“哪个不是内联”

【参考方案1】：

你可以使用这个sample：

//create the mail message
var mail = new MailMessage();

//set the addresses
mail.From = new MailAddress("[e-mail]");
mail.To.Add("[e-mail]");

//set the content
mail.Subject = "This is an email";

//first we create the Plain Text part
var plainView = AlternateView.CreateAlternateViewFromString("This is my plain text content, viewable by those clients that don't support html", null, "text/plain");
//then we create the Html part
var htmlView = AlternateView.CreateAlternateViewFromString("<b>this is bold text, and viewable by those mail clients that support html</b>", null, "text/html");
mail.AlternateViews.Add(plainView);
mail.AlternateViews.Add(htmlView);

//send the message
var smtp = new SmtpClient("127.0.0.1"); //specify the mail server address
smtp.Send(mail);

【讨论】：

它使用的是 AE.Net.Mail，我不明白这个示例是怎么做的

是否使用 ICollection cc = mm.AlternateViews;那么它适用于非mime消息吗？