ASP.NET发邮件程序“SendUsing”配置值无效错误，请各位指点

Question

我用C#采用System.Web.Mail做了一个发邮件的程序，MailMessage的各项参数已经填充完毕了，但是SmtpMail.Send(MailMessage);这条语句总是出“SendUsing”配置值无效这种错误，请各位高人指点。 

Answer 1

引用CDO组件 CDOSYS.DLL
using System;
using System.Web.Mail;
using CDO;
namespace Greystar.Base.Office
{
/// <summary>
/// Email 的摘要说明。
/// </summary>
public class Email
{
public Email()
{
//
// TODO: 在此处添加构造函数逻辑
//
} #region  SendEmailValidate (string Emailfrom,string Emailto,string subject,string mailbody)
/// <summary>
/// 要求有帐号
/// </summary>
/// <param name="Emailfrom"></param>
/// <param name="Emailto"></param>
/// <param name="subject"></param>
/// <param name="mailbody"></param>
public void SendEmailValidate (string Emailfrom,string Emailto,string subject,string mailbody)
{
string ErrString="";
try
{
Configuration conf=new Configuration();
//以下部分设置参数(服务器,端号，用户名，密码，发送邮件帐号，回复邮箱帐号)
conf.Fields[CdoConfiguration.cdoSendUsingMethod].Value=CdoSendUsing.cdoSendUsingPort;
conf.Fields[CdoConfiguration.cdoSMTPServer].Value="server-mail";
conf.Fields[CdoConfiguration.cdoSMTPServerPort].Value=25;
conf.Fields[CdoConfiguration.cdoSMTPAccountName].Value="greystar";
conf.Fields[CdoConfiguration.cdoSendUserReplyEmailAddress].Value="\"greystar\" <[email protected]>";
conf.Fields[CdoConfiguration.cdoSendEmailAddress].Value="\"greystar\" <[email protected]>";
conf.Fields[CdoConfiguration.cdoSMTPAuthenticate].Value=CdoProtocolsAuthentication.cdoBasic;
conf.Fields[CdoConfiguration.cdoSendUserName].Value="greystar";
conf.Fields[CdoConfiguration.cdoSendPassword].Value="liaoliao";
    
conf.Fields.Update();
MessageClass msg=new MessageClass(); msg.Configuration=conf;

msg.To=Emailto;
msg.Subject= subject;
msg.HTMLBody=mailbody;
msg.From=Emailfrom; msg.Send();  
ErrString="确认成功";
}
catch(System.Runtime.InteropServices.COMException Ee)
{  
ErrString=Ee.Message;
throw new Exception(ErrString);
}
}
#endregion  #region SendMail(string MailFrom,string MailTo,string MailSubject,string MailBody,string MailServer  )
/// <summary>
/// 匿名访问
/// </summary>
/// <param name="MailFrom"></param>
/// <param name="MailTo"></param>
/// <param name="MailSubject"></param>
/// <param name="MailBody"></param>
/// <param name="MailServer"></param>
public void SendMail(string MailFrom,string MailTo,string MailSubject,string MailBody,string MailServer  ) { MailMessage Msg = new MailMessage(); Msg.To      = MailTo; Msg.Subject = MailSubject; Msg.Body    = MailBody; Msg.From =MailFrom; SmtpMail.SmtpServer=MailServer; SmtpMail.Send(Msg); return; }
#endregion
}
}

Answer 2

多谢ziyan0218了，我发现错误是因为我没有为SmtpMail.SmtpServer付值，此帖结帖。