Question

如何使用c＃将多个文件附加到电子邮件中。

        MailMessage mail = new MailMessage();
        SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");

        //get the userID, Pass
        userID= register.userName;
        password = register.pass;


        string aa=txtTo.Text;
        mail.From = new MailAddress(userID);
        mail.To.Add(aa);
        mail.Subject = txtsubject.Text;
        mail.Body = txtComments.Text;

        //Attach file
        mail.Attachments.Add(new Attachment(txtAttachments.Text.ToString()));       
        SmtpServer.Port = 587;
        SmtpServer.UseDefaultCredentials = false;
        SmtpServer.Credentials = new System.Net.NetworkCredential(userID, password);
        SmtpServer.EnableSsl = true;
        SmtpServer.Send(mail);
        MessageBox.Show("Email sent successfully");
        this.Cursor = Cursors.Default;

        //close the page
        Email email = new Email();
        email.Close();

此代码仅用于附加一个文件。我怎样才能在c＃2008中附加多个文件。??? Plz给我解决方案。

Answer 1

可以将多个附件添加到Message.Attachments集合

C＃：

Message.Attachments.Add(new System.Net.Mail.Attachment(strAttPath));

VB：

Message.Attachments.Add(New Net.Mail.Attachment(strAttPath))

只需多次拨打.Add，指向每个附件。

Answer 2

...
mail.Body = txtComments.Text;
//Attach file
mail.Attachments.Add(new Attachment(txtAttachments.Text.ToString()));
mail.Attachments.Add(new Attachment(txtAttachments2.Text.ToString()));
mail.Attachments.Add(new Attachment(txtAttachments3.Text.ToString()));
mail.Attachments.Add(new Attachment(txtAttachments4.Text.ToString()));
SmtpServer.Port = 587;
...

Answer 3

只需像上面那样在mail.Attachments集合中添加更多附件。

Answer 4

发送后发布附件文件怎么样？

例如，您发送用于创建附件内容的临时文件。为了这个目的，该文件被重复使用。附件文件需要在附件上以dispose()发布。

要完成此操作，请首先创建附件，以便为其提供一个对象名称，以便稍后与dispose（）一起使用。

Attachment attach = new Attachment(txtAttachments.Text.ToString());    
Message.Attachments.Add(attach);
...

attach.dispose();

Answer 5

protected void SendMail(List<string> attachments)
    {
        UserManagement Users = new UserManagement();
        Users.GetUserInformation();

        SmtpClient client = new SmtpClient(ip_address);
        MailMessage Message = new MailMessage();
        Message.From = new MailAddress(senderaddress);

        Message.To.Add(Users._CurUser_Destination_Email);
        Message.Subject = "Neue Umlagerung - " + cb_auflieger_limburg.SelectedItem.ToString();

        Message.Body = string.Format("Datum: {0}", DateTime.Now) + Environment.NewLine +
                                     "AufliegerNr.: " + cb_auflieger_limburg.SelectedItem.ToString() + Environment.NewLine +
                                     "Benutzer: " + Environment.UserName;

        client.UseDefaultCredentials = true;

        Attachment Attachment = null;

        try
        {
            foreach (string attachment in attachments)
            {
                Attachment = new Attachment(attachment);
                Message.Attachments.Add(Attachment);
            }

            client.Send(Message);
            Attachment.Dispose();
            Message.Dispose();
        }

        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString());
        }
        finally
        {
            foreach(string attachment in attachments)
            {
                //Dateien nach Versendung löschen
                FileInfo fi = new FileInfo(attachment);
                if (fi.Exists)
                {
                    fi.Delete();
                }
            }
        }
    }

参数列表附件由一个类填充，该类以.csv和.pdf的不同格式导出DataGridView。

列表“联系人”包含文件夹和文件名的字符串。

//Exporting to CSV.
string FileName = $"YourFileName_{datetime}.csv";
File.WriteAllText(ExportPath + FileName, csv);

AttachmentsToExport.Add(ExportPath + FileName);

使用C＃在电子邮件中使用多个附件

5 个答案: