C# MailAddressCollection.Clear方法代码示例

        /// <summary>
        /// Applies the override to a MailAddressCollection
        /// </summary>
        /// <param name="addresses">The addresses.</param>
        /// <returns></returns>
        protected MailAddressCollection ApplyMailAddressOverride(MailAddressCollection addresses)
        {
            if (clear)
            {
                addresses.Clear();
            }
            else
            {
                if (!string.IsNullOrEmpty(overrideString))
                {
                    addresses.Clear();
                    addresses.Add(overrideString);
                }

                if (!string.IsNullOrEmpty(prependString))
                {
                    var old = addresses.ToString();
                    addresses.Clear();
                    addresses.Add(prependString);
                    if(!string.IsNullOrWhiteSpace(old)) addresses.Add(old);
                }

                if (!string.IsNullOrEmpty(appendString))
                {
                    addresses.Add(appendString);
                }
            }

            return addresses;
        }

        /// <summary>
        /// This method takes the input from the form, creates a mail message and sends it to the smtp server
        /// </summary>
        private void SendEmail()
        {
            // make sure we have values in user, password and To
            if (ValidateForm() == false)
            {
                return;
            }

            // create mail, smtp and mailaddress objects
            MailMessage mail = new MailMessage();
            SmtpClient smtp = new SmtpClient();
            MailAddressCollection mailAddrCol = new MailAddressCollection();

            try
            {
                // set the From email address information
                mail.From = new MailAddress(txtBoxEmailAddress.Text);

                // set the To email address information
                mailAddrCol.Clear();
                _logger.Log("Adding To addresses: " + txtBoxTo.Text);
                mailAddrCol.Add(txtBoxTo.Text);
                MessageUtilities.AddSmtpToMailAddressCollection(mail, mailAddrCol, MessageUtilities.addressType.To);

                // check for Cc and Bcc, which can be empty so we only need to add when the textbox contains a value
                if (txtBoxCC.Text.Trim() != "")
                {
                    mailAddrCol.Clear();
                    _logger.Log("Adding Cc addresses: " + txtBoxCC.Text);
                    mailAddrCol.Add(txtBoxCC.Text);
                    MessageUtilities.AddSmtpToMailAddressCollection(mail, mailAddrCol, MessageUtilities.addressType.Cc);
                }

                if (txtBoxBCC.Text.Trim() != "")
                {
                    mailAddrCol.Clear();
                    _logger.Log("Adding Bcc addresses: " + txtBoxBCC.Text);
                    mailAddrCol.Add(txtBoxBCC.Text);
                    MessageUtilities.AddSmtpToMailAddressCollection(mail, mailAddrCol, MessageUtilities.addressType.Bcc);
                }

                // set encoding for message
                if (Properties.Settings.Default.BodyEncoding != "")
                {
                    mail.BodyEncoding = MessageUtilities.GetEncodingValue(Properties.Settings.Default.BodyEncoding);
                }
                if (Properties.Settings.Default.SubjectEncoding != "")
                {
                    mail.SubjectEncoding = MessageUtilities.GetEncodingValue(Properties.Settings.Default.SubjectEncoding);
                }
                if (Properties.Settings.Default.HeaderEncoding != "")
                {
                    mail.HeadersEncoding = MessageUtilities.GetEncodingValue(Properties.Settings.Default.HeaderEncoding);
                }

                // set priority for the message
                switch (Properties.Settings.Default.MsgPriority)
                {
                    case "High":
                        mail.Priority = MailPriority.High;
                        break;
                    case "Low":
                        mail.Priority = MailPriority.Low;
                        break;
                    default:
                        mail.Priority = MailPriority.Normal;
                        break;
                }

                // add HTML AltView
                if (Properties.Settings.Default.AltViewHtml != "")
                {
                    ContentType ctHtml = new ContentType("text/html");
                    htmlView = AlternateView.CreateAlternateViewFromString(Properties.Settings.Default.AltViewHtml, ctHtml);

                    // add inline attachments / linked resource
                    if (inlineAttachmentsTable.Rows.Count > 0)
                    {
                        foreach (DataRow rowInl in inlineAttachmentsTable.Rows)
                        {
                            LinkedResource lr = new LinkedResource(rowInl.ItemArray[0].ToString());
                            lr.ContentId = rowInl.ItemArray[1].ToString();
                            lr.ContentType.MediaType = rowInl.ItemArray[2].ToString();
                            htmlView.LinkedResources.Add(lr);
                            lr.Dispose();
                        }
                    }

                    // set transfer encoding
                    htmlView.TransferEncoding = MessageUtilities.GetTransferEncoding(Properties.Settings.Default.htmlBodyTransferEncoding);
                    mail.AlternateViews.Add(htmlView);
                }

                // add Plain Text AltView
                if (Properties.Settings.Default.AltViewPlain != "")
                {
                    ContentType ctPlain = new ContentType("text/plain");
//.........这里部分代码省略.........