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发送电子邮件也是项目开发当中经常用到的功能，这里我整理了一个发送电子邮件（带附件，支持多用户发送，主送、抄送）的类库，供大家参考。
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先上两个实体类，用于封装成Mail对象。
////// 发送邮件请求 /// public class MailRequest { #region PrivateFields ////// 文件名 /// private string _fromField; ////// 返送到 /// private string _toField; ////// 抄送 /// private string _copyField; ////// 附件 /// private string _bccField; ////// 标题 /// private string _subjectField; ////// 发送人名 /// private string _bodyField; ////// 类容 /// private MailRequestAttachments[] _p_w_uploadsField; #endregion ////// 发送人，多个人以分号;间隔 /// public string From { get { return this._fromField; } set { this._fromField = value; } } ////// 收件人，多个人以分号;间隔 /// public string To { get { return this._toField; } set { this._toField = value; } } ////// 抄送人，多个人以分号;间隔 /// public string CC { get { return this._copyField; } set { this._copyField = value; } } ////// 秘密抄送人，多个人以分号;间隔 /// public string Bcc { get { return this._bccField; } set { this._bccField = value; } } ////// 主题 /// public string Subject { get { return this._subjectField; } set { this._subjectField = value; } } ////// 内容 /// public string Body { get { return this._bodyField; } set { this._bodyField = value; } } ////// 附件列表 /// public MailRequestAttachments[] Attachments { get { return this._p_w_uploadsField; } set { this._p_w_uploadsField = value; } } }
////// 发送邮件请求附件 /// public class MailRequestAttachments { #region PrivateFields ////// 文件名 /// private string _fileNameField; ////// 文件内容 /// private byte[] _fileDataField; #endregion ////// 文件名 /// public string FileName { get { return this._fileNameField; } set { this._fileNameField = value; } } ////// 文件内容 /// public byte[] FileData { get { return this._fileDataField; } set { this._fileDataField = value; } } }
附件的内容很简单，因为在网络传输当中，是以字节流的形式传输的，因此附件的传输需要转换成字节流数组。
////// 邮件帮助类 /// public static class MailHelper { ////// 发送邮件 /// /// 邮件内容对象 ///发送邮件所遇到的异常 public static string SendMail(MailRequest request) { try { MailMessage mail = new MailMessage(); if (string.IsNullOrEmpty(request.From)) { request.From = WebConfigurationManager.AppSettings["DefaultMailFrom"]; } mail.From = new MailAddress(request.From); PaserMailAddress(request.To, mail.To); PaserMailAddress(request.CC, mail.CC); PaserMailAddress(request.Bcc, mail.Bcc); mail.Subject = request.Subject; mail.SubjectEncoding = System.Text.Encoding.UTF8; mail.Body = request.Body; mail.ReplyTo = new MailAddress(request.From); mail.IsBodyHtml = true; if (request.Attachments != null && request.Attachments.Length > 0) { for (int i = 0; i < request.Attachments.Length; i++) { Attachment mailAttach = new Attachment(ByteArrayToStream(request.Attachments[i].FileData), request.Attachments[i].FileName); mail.Attachments.Add(mailAttach); } } if (string.IsNullOrEmpty(WebConfigurationManager.AppSettings["SMTPSERVER"])) { throw new ApplicationException("邮件服务无效"); } //Smtp Server SmtpClient mailClient = new SmtpClient(WebConfigurationManager.AppSettings["SMTPSERVER"]); if (!string.IsNullOrEmpty(WebConfigurationManager.AppSettings["SMTPSERVERPORT"])) { //端口号 try { mailClient.Port = Int32.Parse(WebConfigurationManager.AppSettings["SMTPSERVERPORT"]); } catch { return "SMTP服务器端口设置错误，端口必须设置为数值型"; } } if (!string.IsNullOrEmpty(WebConfigurationManager.AppSettings["MAILUSER"])) { mailClient.Credentials = new System.Net.NetworkCredential(WebConfigurationManager.AppSettings["MAILUSER"], WebConfigurationManager.AppSettings["MAILUSERPW"]); mailClient.DeliveryMethod = SmtpDeliveryMethod.Network; } else { mailClient.Credentials = CredentialCache.DefaultNetworkCredentials; } mailClient.Send(mail); mail.Dispose(); return "邮件发送成功。"; } catch (SmtpFailedRecipientsException e) { return e.Message; } catch (SmtpFailedRecipientException e) { return e.Message; } catch (SmtpException e) { return e.Message; } catch (Exception e) { return e.Message; } } ////// 解析分解邮件地址 /// /// 邮件地址 /// 邮件对象 private static void PaserMailAddress(string mailAddress, MailAddressCollection mailCollection) { if (string.IsNullOrEmpty(mailAddress)) { return; } char[] separator = new char[2] { ',', ';' }; string[] addressArray = mailAddress.Split(separator); foreach (string address in addressArray) { if (address.Trim() == string.Empty) { continue; } mailCollection.Add(new MailAddress(address)); } } ////// 字节数组转换为流 /// /// 字节数组 ///Stream private static Stream ByteArrayToStream(byte[] byteArray) { MemoryStream mstream = new MemoryStream(byteArray); return mstream; } }
这是一个邮件助手类，定义成static，无需实例化，直接类名.方法名的形式调用。
只需要上述3个类就可以实现发送Email了，由于上面引用的是web.config里面的信息（asp.net等命名空间，如果是winform等需要自己修改一下），这里还需要配置一下web.config，如下所示：
最后上一个测试方法，在主函数当中或者Page_Load事件中执行即可：
private void SendEmailExample()
{
MailRequest mail = new MailRequest();
mail.Subject = "hello,this is a e-mail sent by asp.net mailhelper.";//主题
mail.Body = "hello,this is a e-mail sent by asp.net mailhelper.欢迎访问我的博客。";//内容
mail.Bcc = "512122338@qq.com";//秘密抄送人
mail.From = "345822155@qq.com";//发送人
mail.CC = "guwei4037@sina.com";//抄送人
mail.To = "guwei4037@gmail.com";//收件人
//读取文件到bytes
FileStream stream = new FileStream(Path.Combine(Server.MapPath("~"), "doc\\test.txt"), FileMode.OpenOrCreate, FileAccess.Read, FileShare.Read);
byte[] bytes = new byte[stream.Length];
stream.Read(bytes, 0, bytes.Length);
stream.Close();
//附件
MailRequestAttachments p_w_uploads = new MailRequestAttachments();
p_w_uploads.FileName = "test.txt";
p_w_uploads.FileData = bytes;
mail.Attachments = new MailRequestAttachments[] {
p_w_uploads
};
string sendMainResult = "-1";
if (!string.IsNullOrEmpty(mail.CC.Replace(";", "")) && !string.IsNullOrEmpty(mail.To.Replace(";", "")))
{
sendMainResult = MailHelper.SendMail(mail);
}
Response.Write(sendMainResult);
}发送邮件成功，附件也能正常打开，而且多个用户都收到了电子邮件。截图为证。
源代码下载，请点击这里。
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