c# 发送邮件功能

注意的地方

1. MailMessage email = new MailMessage();  //实例化邮件对象
    email.Subject = dt.Rows[0]["THEME"].ToString().Replace('\r', ' ').Replace('\n', ' ');//主题里面这些东西报错

   邮件主题有时候我们的输入框是可以换行的,就会有换行符,邮件协议里面的主题是不允许有这些"\r,\n",需要过滤掉.

2.添加密送 邮件地址的时候要正确的邮箱地址,不然也会抛出异常,  email.Bcc.Add("邮件地址");//密送 ,例如这个邮箱地址就不对"xiao.h.x.@163.com", x.@这中间有一个点,不符合邮件地址格式

3.邮件发送的图片的内容,如果是插入图片的链接的时候,最好是给图片设置一个宽度,在outLOOK 里面图片宽度超过了一定长度就显示不出来,大慨设置为"900",不然发送的图片,用OUTLOOK 打开看不到.

/// <summary>
        /// 发送邮件
        /// </summary>
        private static void SendEmail(Task task)
        {
            //定义失败明细数
            int failedcount = 0;

            int emailFailedCount = 0;
            //获取邮件
            DataTable dt = Dao.GetDataTable(string.Format(Config.Sql_strGetEmail, task.TaskId));
            if (dt.Rows.Count == 0) return;

            #region 初始化邮件

            MailMessage email = new MailMessage();
            //实例化邮件对象
            try
            {
                email.Subject = dt.Rows[0]["THEME"].ToString().Replace('\r', ' ').Replace('\n', ' ');//主题里面这些东西报错.
                email.Body = dt.Rows[0]["ECONTENT"].ToString();
                email.IsBodyHtml = true;
            }
            catch(Exception exce)
            {
                Log.WriteLog_Email(string.Format("邮件初始化失败！原因:{0}", exce.Message));
                return;
            }

            #endregion

            #region 附件
            //创建任务附件文件夹
            if (!Directory.Exists("Attachments"))
                Directory.CreateDirectory("Attachments");
            if (!Directory.Exists(string.Format(@"Attachments\{0}", task.TaskId)))
                Directory.CreateDirectory(string.Format(@"Attachments\{0}", task.TaskId));
            //获取附件
            DataTable attachments = Dao.GetDataTable(string.Format(Config.Sql_strGetAttachmentsByTaskId, task.TaskId));
            //遍历附件
            if (attachments.Rows.Count > 0)
            {
                Attachment attachment = null;
                string filename;
                foreach (DataRow row in attachments.Rows)
                {
                    filename = string.Format(@"Attachments\{0}\{1}", task.TaskId, row["FILENAME"].ToString());
                    try
                    {
                        File.WriteAllBytes(filename, (byte[])row["CONTENT"]);
                    }
                    catch (Exception ex)
                    {
                        //Log.WriteLog(string.Format("附件下载异常:{0}", ex.Message));
                    }
                    attachment = new Attachment(filename);
                    email.Attachments.Add(attachment);
                }
            }

            #endregion

            #region 根据登录的邮箱查找对应的验证用户和密码
            //邮箱的登录帐号
            string loginName = dt.Rows[0]["SENDNAME"].ToString();
            string loginPwd = dt.Rows[0]["PASSWORD"].ToString();
            DataTable emailLoginIdDT = Dao.GetDataTable(string.Format(Config.SQL_strEmailLoginId, dt.Rows[0]["SENDNAME"].ToString()));
            if (emailLoginIdDT.Rows.Count>0)
            {
                loginName = emailLoginIdDT.Rows[0]["ACCOUNT"].ToString();
                loginPwd = emailLoginIdDT.Rows[0]["PASSWORD"].ToString();
            }

            #endregion

            #region 初始化发送对象

            SmtpClient client = new SmtpClient();
            client.UseDefaultCredentials = false;
            switch (Config.AppState)
            {
                default:
                    break;
                case AppState.Local:
                    email.From = new MailAddress(Config.LEmailAccount);
                    client.Host = Config.LSmtp;
                    client.Port = Config.LMailPort;
                    client.Credentials = new System.Net.NetworkCredential(Config.LEmailAccount, Config.LEmailPwd);
                    break;
                case AppState.Dev:
                case AppState.Test:
                case AppState.Production:
                    try
                    {
                        email.From = new MailAddress(dt.Rows[0]["SENDNAME"].ToString());
                        client.Host = Config.RSmtp;
                        client.Port = Config.RMailPort;
                        client.Credentials = new System.Net.NetworkCredential(loginName, loginPwd);
                    }
                    catch(Exception exx)
                    {
                        Log.WriteLog_Email(string.Format("邮件初始化失败！原因:{0}", exx.Message));
                        return;
                    }
                    break;
            }
            client.DeliveryMethod = SmtpDeliveryMethod.Network;

            #endregion

            #region 遍历发送
            //修改地方 by andy 2012-05-11
            #region 修改取数据
            List<ITaskDetail> tempDetails = new List<ITaskDetail>();
            string strDetail = Config.Sql_strDetail;
        
            DataTable dtDetail = new DataTable();
            OracleConnection conn = new OracleConnection();
            conn.ConnectionString = Config.DbConnectionString;
            OracleCommand comm = conn.CreateCommand();
            OracleDataAdapter adapter = new OracleDataAdapter(comm);
            try
            {
                conn.Open();
                comm.CommandText = strDetail;
                adapter.Fill(dtDetail);
                Log.WriteLog_Email("数据加载成功！");
            }
            catch (Exception ex)
            {
                Log.WriteLog_Email(string.Format("数据加载失败！原因:{0}", ex.Message));
            }
            finally
            {
                conn.Close();
            }
          
            string detailid;
            string taskid;
            int sstate;
            string tag;
            foreach (DataRow row in dtDetail.Rows)
            {
                detailid = Convert.ToString(row["DETAILID"]);
                taskid = Convert.ToString(row["TASKID"]);
                sstate = Convert.ToInt32(row["SENDSTATE"]);
                tag = Convert.ToString(row["TAG"]);
                tempDetails.Add(new ITaskDetail(detailid, taskid, sstate, tag));
            }

            //过滤获取这个任务的ID
            List<ITaskDetail> details = new List<ITaskDetail>();
            IEnumerable<ITaskDetail> tds = from detail in tempDetails
                                           where detail.TaskId == task.TaskId
                                           select detail;

            foreach (ITaskDetail tempdl in tds)
            {
                details.Add(tempdl);
            }
            #endregion

            // foreach (ITaskDetail detail in task.Details)
            foreach (ITaskDetail detail in details)
            {
                if (detail.Sendstate == SendState.Success) continue;
                email.Bcc.Clear();
                if (string.IsNullOrEmpty(detail.Tag))
                {
                    Log.WriteLog_Email(string.Format("邮件明细{0}跳过发送，因为没有邮件地址！", detail.DetailId));
                    continue;
                }
                try
                {
                    email.Bcc.Add(detail.Tag);//密送
                }
                catch(Exception ec)
                {
                    Log.WriteLog_Email(string.Format("邮件地址不正确 {0}  添加密送失败 ！", detail.Tag));
                    emailFailedCount++; //邮件地址不对的
                    detail.Sendstate = SendState.Fail;
                    Log.WriteLog_Email(string.Format("邮件明细{0}({1})发送失败，原因{2}", detail.DetailId, detail.Tag, ec.InnerException == null ? ec.Message : ec.InnerException.Message));
                    Dao.ExecuteSql(string.Format(Config.Sql_strSendEmailFail, detail.DetailId));

                    Dao.ExecuteSql(string.Format(Config.Sql_strUpdateDetail, (int)detail.Sendstate, detail.Tag, detail.DetailId));
                    continue;
                }

                try
                {
                    client.Send(email);
                    detail.Sendstate = SendState.Success;
                    Log.WriteLog_Email(string.Format("邮件明细{0}({1})发送成功！", detail.DetailId, detail.Tag));
                    Dao.ExecuteSql(string.Format(Config.Sql_strSendEmailSucess, detail.DetailId));
                }
                catch (Exception ex)
                {
                    detail.Sendstate = SendState.Fail;
                    failedcount++;
                    Log.WriteLog_Email(string.Format("邮件明细{0}({1})发送失败，原因{2}", detail.DetailId, detail.Tag, ex.InnerException == null ? ex.Message : ex.InnerException.Message));
                    Dao.ExecuteSql(string.Format(Config.Sql_strSendEmailFail, detail.DetailId));
                }
                finally
                {
                    Dao.ExecuteSql(string.Format(Config.Sql_strUpdateDetail, (int)detail.Sendstate, detail.Tag, detail.DetailId));
                }
            }

            #endregion

            #region 状态处理

            Log.WriteLog_Email(string.Format("邮件任务{0}第{3}次发送完毕,总共{1}封，失败{2}封", task.TaskId, details.Count, failedcount > 0 ? failedcount : emailFailedCount, task.SendTimes));
            task.Taskstate = failedcount == 0 ? TaskState.Executed : TaskState.Nonexecution;
            task.UpdateState();
           
            #endregion
        }