asp.net email 发送大附件

悬赏园豆：100 [已解决问题] 解决于 2010-07-13 16:46

最近我在一个项目： 项目中用到asp.net mail类发送外部邮件，但是却发现一个问题就是不能发送大附件（3M以上）发送大附件会出现如下界面  <img src="http://pic002.cnblogs.com/img/liaoxueping/201007/2010071217320679.gif" alt="" />       弹出服务器超时 我已经在页面设置 1.<asp:ScriptManager ID="ScriptManager1" runat="server" EnableScriptGlobalization="true"  AsyncPostBackTimeout="36000"         EnableScriptLocalization="false"> </asp:ScriptManager> 2.数据库连接：selectCommand.CommandTimeout = 36000; 3.webConfi页面设置： <httpRuntime maxRequestLength="2097150" executionTimeout="36000" />     我后台发送email代码如下，附件是从数据库中读取出来，将字节转换成流发送 但是附件过大，就出现如上显示，进入调试状态：则出现如下页面  <img src="http://pic002.cnblogs.com/img/liaoxueping/201007/2010071217322569.gif" alt="" />           我把后台代码标识出来：   private bool webf_sendmail(ref string ls_err, string ls_j, int tempBillid, ref string arg_msg)     {           bool rslt = true;           try         {             if ((txb_sjr.Text.Trim().Trim(';').Trim() != "" || txb_csr.Text.Trim().Trim(';').Trim() != "" || txb_msr.Text.Trim().Trim(';').Trim() != "") && ((ddl_pop_mail.SelectedValue == "-1" ? "" : ddl_pop_mail.SelectedValue.Trim()) != ""))             {                 //获取POP邮箱设置信息                 string ls_mail_sql = "select pop_longname,pop_longpassword,pop_name,pop_sendserver,pop_sendport from oa_pop_mysetup where   pop_billid=" + ddl_pop_mail.SelectedValue.Trim() + "";                 DataTable dt_mail = cs_con.Select(ls_mail_sql, null, ref arg_msg).Tables[0];                 if (dt_mail.Rows.Count > 0)                 {                     if (dt_mail.Rows[0]["pop_longname"].ToString().Trim() != "")                     {                         System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage();                         string SendTos = txb_sjr.Text.Trim().Trim(';').Trim();　　//发送人                         string CcTos = txb_csr.Text.Trim().Trim(';').Trim();  　　  //抄送人                         string MsTos = txb_msr.Text.Trim().Trim(';').Trim();      //密送人                             //获取POP邮箱设置中发件地址，及发件人姓名                         MailAddress from = null;//发件箱地址                         string ls_poplongname = dt_mail.Rows[0]["pop_longname"].ToString().Trim();                         string ls_poppassword = dt_mail.Rows[0]["pop_longpassword"].ToString().Trim();                         ls_poppassword = method.Decrypto(ls_poppassword);                           //发件箱地址密码                         string ls_popserver = (@"" + dt_mail.Rows[0]["pop_sendserver"].ToString().Trim()).ToString().Trim();//发送邮件smtp配置                             if (dt_mail.Rows[0]["pop_name"].ToString().Trim() != "")                         {                             from = new MailAddress(ls_poplongname, dt_mail.Rows[0]["pop_name"].ToString().Trim());                         }                         else                         {                             from = new MailAddress(ls_poplongname, "");                         }                         message.From = from;//发件人                         message.Subject = this.txtTitle.Text.ToString().Trim();//邮件标题                         message.Body = ls_j.ToString().Trim(); //邮件内容                         message.BodyEncoding = System.Text.Encoding.Default;//内容编码格式                         message.IsBodyHtml = true;                           //  发送附件                         string ls_send_mail_sql = "select billid,file_name,add_file,file_size from permit_msg_image where referbillid=" + tempBillid + " and refer_type=0; ";                         DataTable dt_mail_file = cs_con_image.Select(ls_send_mail_sql, null, ref arg_msg).Tables[0]; //重点                         if (dt_mail_file.Rows.Count > 0)                         {                             Stream stream = null;                             //将字节转换成流的方式发送附件                             for (int i = 0; i < dt_mail_file.Rows.Count; i++)                             {                                 Byte[] bytes = (Byte[])(dt_mail_file.Rows[i]["add_file"]);                                 stream = new MemoryStream(bytes);                                 System.Net.Mail.Attachment item = new System.Net.Mail.Attachment(stream, dt_mail_file.Rows[i]["file_name"].ToString().Trim());                                 item.NameEncoding = System.Text.Encoding.UTF8;                                 message.Attachments.Add(item);                               }                                 //收件人                             string[] lz_send = System.Text.RegularExpressions.Regex.Split(SendTos, ";"); //总收件人                             if (SendTos != "" && lz_send.Length > 0)                             {                                   for (int i_send = 0; i_send < lz_send.Length; i_send++)                                 {                                     if (lz_send[i_send].ToString().Trim() != "")                                     {                                         MailAddress to = new MailAddress(lz_send[i_send].Trim());                                         message.To.Add(to);                                     }                                 }                             }                               //抄送人                             string[] lz_cc = System.Text.RegularExpressions.Regex.Split(CcTos, ";");  //总收件人                             if (CcTos != "" && lz_cc.Length > 0)                             {                                 for (int i_cc = 0; i_cc < lz_cc.Length; i_cc++)                                 {                                     if (lz_cc[i_cc].ToString().Trim() != "")                                     {                                         MailAddress cc = new MailAddress(lz_cc[i_cc].Trim());                                         message.CC.Add(cc);                                     }                                 }                             }                               //密送人                             string[] lz_ms = System.Text.RegularExpressions.Regex.Split(MsTos, ";");  //总收件人                             if (MsTos != "" && lz_ms.Length > 0)                             {                                 for (int i_ms = 0; i_ms < lz_ms.Length; i_ms++)                                 {                                     if (lz_ms[i_ms].ToString().Trim() != "")                                     {                                         MailAddress ms = new MailAddress(lz_ms[i_ms].Trim());                                         message.Bcc.Add(ms);                                     }                                 }                             }                               //创建一个SmtpClient 类的新实例,并初始化实例的SMTP 事务的服务器                             SmtpClient client = new SmtpClient(ls_popserver);                             try                             {                                   client.DeliveryMethod = SmtpDeliveryMethod.Network;                                 client.UseDefaultCredentials = false;                                 client.EnableSsl = false;                             }                             catch (Exception ex)                             {                                   rslt = false;                                 stream.Close();                                 stream.Dispose();                                 arg_msg = "请检查POP设置中发送邮件服务器(SMTP)!";                                 goto ext_webf_sendmail_end;                             }                               try                             {                                 client.Credentials = new System.Net.NetworkCredential(ls_poplongname, ls_poppassword);//检查发件箱地址及密码的正确性                             }                             catch (Exception ex)                             {                                 rslt = false;                                 stream.Close();                                 stream.Dispose();                                 arg_msg = "请检查POP设置中邮箱地址及密码！";                                 goto ext_webf_sendmail_end;                             }                             //  ext_webf_sendmail: ;                             try                             {                                 client.Send(message);                                 stream.Close();                                 stream.Dispose();                               }                             catch (SmtpException ex)                             {                                 rslt = false;                                 stream.Close();                                 stream.Dispose();                                 arg_msg = "发送异常：" + ex.Message.ToString();                                 goto ext_webf_sendmail_end;                             }                             }                         else                         {                             //收件人                             string[] lz_send = System.Text.RegularExpressions.Regex.Split(SendTos, ";"); //总收件人                             if (SendTos != "" && lz_send.Length > 0)                             {                                   for (int i_send = 0; i_send < lz_send.Length; i_send++)                                 {                                     if (lz_send[i_send].ToString().Trim() != "")                                     {                                         MailAddress to = new MailAddress(lz_send[i_send].Trim());                                         message.To.Add(to);                                     }                                 }                             }                               //抄送人                             string[] lz_cc = System.Text.RegularExpressions.Regex.Split(CcTos, ";");  //总收件人                             if (CcTos != "" && lz_cc.Length > 0)                             {                                 for (int i_cc = 0; i_cc < lz_cc.Length; i_cc++)                                 {                                     if (lz_cc[i_cc].ToString().Trim() != "")                                     {                                         MailAddress cc = new MailAddress(lz_cc[i_cc].Trim());                                         message.CC.Add(cc);                                     }                                 }                             }                               //密送人                             string[] lz_ms = System.Text.RegularExpressions.Regex.Split(MsTos, ";");  //总收件人                             if (MsTos != "" && lz_ms.Length > 0)                             {                                 for (int i_ms = 0; i_ms < lz_ms.Length; i_ms++)                                 {                                     if (lz_ms[i_ms].ToString().Trim() != "")                                     {                                         MailAddress ms = new MailAddress(lz_ms[i_ms].Trim());                                         message.Bcc.Add(ms);                                     }                                 }                             }                               //创建一个SmtpClient 类的新实例,并初始化实例的SMTP 事务的服务器                             SmtpClient client = new SmtpClient(ls_popserver);                             try                             {                                   client.DeliveryMethod = SmtpDeliveryMethod.Network;                                 client.UseDefaultCredentials = false;                                 client.EnableSsl = false;                             }                             catch (Exception ex)                             {                                   rslt = false;                                   arg_msg = "请检查POP设置中发送邮件服务器(SMTP)!";                                 goto ext_webf_sendmail_end;                             }                               try                             {                                 client.Credentials = new System.Net.NetworkCredential(ls_poplongname, ls_poppassword);//检查发件箱地址及密码的正确性                             }                             catch (Exception ex)                             {                                 rslt = false;                                   arg_msg = "请检查POP设置中邮箱地址及密码！";                                 goto ext_webf_sendmail_end;                             }                               try                             {                                 client.Send(message);                                 }                             catch (SmtpException ex)                             {                                 rslt = false;                                   arg_msg = "发送异常：" + ex.Message.ToString();                                 goto ext_webf_sendmail_end;                             }                         }                     }                     }                 else                 {                     arg_msg = "请检查POP邮箱设置！";                     rslt = false;                     goto ext_webf_sendmail_end;                 }               }         }         catch (Exception ex)         {             arg_msg = "发送外部邮件异常：" + ex.Message.ToString();             rslt = false;             goto ext_webf_sendmail_end;         }       ext_webf_sendmail_end: ;         return rslt;       }

.NET技术 ASP.NET

问题补充： 而且超时之后，，刚刚一楼说设置SmtpClient.Timeout 之后，也还是没有解决只是比之前迟点点，进入调试之后，还是说操作超时...........,,进入调试还是第二张图片的提示超时，可以发送大点的附件，但是还是超时哦！

廖雪萍 | 初学一级 | 园豆：88
提问于：2010-07-12 17:31

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最佳答案

SmtpClient.Timeout 设置一个较长的时间.

收获园豆：70

Launcher | 高人七级 |园豆：45050 | 2010-07-12 17:38

你是不是写了一个aspx的页面，在这个页面中有一个button，点击button后，调用服务器上发送邮件的方法，客户端浏览器等待发送结果，但是服务器在指定时间内没有生成结果页面，是这样的吗？

Launcher | 园豆：45050 (高人七级) | 2010-07-12 21:03

@Galactica:我这个发送邮件是调用asp.net using System.Net.Mail;来发送邮件的，现在我设置了SmtpClient.Timeout现在可以发送大一点的附件了，但是附件3M以上还是会出现超时问题，我已经把SmtpClient.Timeout = 3600000;已经很大了

廖雪萍 | 园豆：88 (初学一级) | 2010-07-13 08:11

@Galactica: 我是在页面上有个button，点击button之后调用上面的webf_sendmail这个方法，是不是asp.net mail 是不是只能发送很小的附件！

廖雪萍 | 园豆：88 (初学一级) | 2010-07-13 08:12

@廖雪萍:和你的SMTP运营商有关,他们有对附件大小的限制.

Launcher | 园豆：45050 (高人七级) | 2010-07-13 09:21

这个应该没有吧！因为我根本就没有跟SMTP运营商有关联吧！因为调用asp.net using System.Net.Mail; 这个跟运营商有关联吗？我可以发送大附件，但是就是弹出超时，这个应该跟我的哪里代码有关联吧

廖雪萍 | 园豆：88 (初学一级) | 2010-07-13 14:31

@廖雪萍:发邮件,得有个smtp服务器去接收,而一般的smtp服务器都有附件大小限制.你可以把发送邮件的代码放在控制台程序中去尝试发送不同大小的邮件,得出一个平均发送时间,然后根据你最大可能发送的邮件,来设置超时.另外,我看到3楼有人指出了页面的超时设置,这个超时应该比发送邮件大点.如果发送邮件非常耗时,我还是建议分两步实现,一是发送,一是查询发送结果.

Launcher | 园豆：45050 (高人七级) | 2010-07-13 16:48

@廖雪萍:@Galactica: 呵呵.....

廖雪萍 | 园豆：88 (初学一级) | 2010-09-26 09:27

其他回答(3)

是不是接收邮件服务器的问题，试试其它的邮箱看行不行。

收获园豆：10

Astar | 园豆：40805 (高人七级) | 2010-07-13 08:23

这个跟邮件服务器没有关系，因为发送邮件跟附件都是OK的啦！就是如果附件过大的话，那么就会超时，发送还是可以发送出去的啦！

支持(0) 反对(0) 廖雪萍 | 园豆：88 (初学一级) | 2010-07-13 09:13

webConfi页面设置：

    <system.webServer>
        <security>
            <requestFiltering >
                <requestLimits maxAllowedContentLength="1073741824" ></requestLimits>
            </requestFiltering>
        </security>
    </system.webServer>
    <system.web>
        <httpRuntime maxRequestLength="2097151" executionTimeout="50000" />

大哥你少加

<system.webServer>
        <security>
            <requestFiltering >                
　　　　　　<requestLimits

收获园豆：10

熊哥 | 园豆：682 (小虾三级) | 2010-07-13 14:26

其实最好不要用IIS直接发邮件，万一hang了连web也受影响，不如插到邮件数据库（或消息队列）中，写个windows service慢慢发

收获园豆：10

LanceZhang | 园豆：857 (小虾三级) | 2010-07-13 16:42

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