C# 发送email邮件！

利用C#邮件发送邮箱使用到两个类SmtpClient和MailMessage。可以把SmtpClient看做发送邮件信息的客户端，而把MailMessage看做需要发送的消息。

下面是我写的发送邮件的公共方法：

  1  /// <summary>
  2         /// 
  3         /// </summary>
  4         /// <param name="ServerIP">发送邮件服务器ip或者域名</param>
  5         /// <param name="ServerPort">服务器端口</param>
  6         /// <param name="UserName">发件人的账号</param>
  7         /// <param name="Password">发件人的密码</param>
  8         /// <param name="FromAddress">发件人的邮箱地址</param>
  9         /// <param name="FromAddressName">发件人名称</param>
 10         /// <param name="Subject">主题</param>
 11         /// <param name="Body">正文</param>
 12         /// <param name="ToAddressList">收件人集合</param>
 13         /// <param name="CCAddressList">副本收件人集合</param>
 14         /// <param name="BccAddressList">密件抄送收件人集合</param>
 15         /// <param name="IsHtml">正文是否可以使用html标签</param>
 16         /// <param name="AttachMentFileList">附件</param>
 17         /// <param name="MailPriority">发送邮件的优先级 三个选项：低 中 高</param>
 18         /// <returns></returns>
 19         public String SendMail(string ServerIP, int? ServerPort, string UserName, string Password, string FromAddress, string FromAddressName, string Subject, string Body, List<string> ToAddressList, List<string> CCAddressList, List<string> BccAddressList, bool IsHtml, List<AttachmentFile> AttachMentFileList, MailPriority MailPriority)
 20         {
 21             try
 22             {
 23                 if (string.IsNullOrEmpty(ServerIP))
 24                 {
 25                     return "ServerIP 不能为空!";
 26                 }
 27 
 28                 SmtpClient mSmtpClient = new SmtpClient(ServerIP); //申明SmtpClient对象
 29                 System.Net.Mail.MailMessage mMailMessage = new System.Net.Mail.MailMessage(); //申明MailMessage对象
 30 
 31                 if (ServerPort != null)
 32                 {
 33                     mSmtpClient.Port = (int)ServerPort;
 34                 }
 35 
 36                 if (String.IsNullOrEmpty(FromAddress))
 37                 {
 38                     return "发件人不能为空";
 39                 }
 40 
 41                 if (string.IsNullOrEmpty(FromAddressName))
 42                 {
 43                     mMailMessage.From = new MailAddress(FromAddress);
 44                 }
 45                 else
 46                 {
 47                     mMailMessage.From = new MailAddress(FromAddress, FromAddressName);
 48                 }
 49 
 50                 if (string.IsNullOrEmpty(Subject))
 51                 {
 52                     return "主旨不能为空!";
 53                 }
 54 
 55                 if (ToAddressList == null || ToAddressList.Count() == 0)
 56                 {
 57                     return "收件人不能为空!";
 58                 }
 59 
 60                 // mSmtpClient.UseDefaultCredentials = false;
 61                 mSmtpClient.Credentials = new NetworkCredential(UserName, Password); //设置发送人的邮箱账号和密码，163邮箱有设置授权码
 62                 mSmtpClient.EnableSsl = true;  //启用ssl,也就是安全发送
 63 
 64                 foreach (var item in ToAddressList)  //收件者
 65                 {
 66                     mMailMessage.To.Add(item);
 67                 }
 68                 if (CCAddressList != null && CCAddressList.Count() != 0)
 69                 {
 70                     foreach (var item in CCAddressList)  //副本
 71                     {
 72                         mMailMessage.CC.Add(item);
 73                     }
 74                 }
 75 
 76                 if (BccAddressList != null && BccAddressList.Count() != 0)
 77                 {
 78                     foreach (var item in BccAddressList)  //密件抄送人员
 79                     {
 80                         mMailMessage.Bcc.Add(item);
 81                     }
 82                 }
 83 
 84                 mMailMessage.Subject = Subject;
 85                 mMailMessage.IsBodyHtml = IsHtml; //正文是否使用html标签展示
 86                 mMailMessage.Body = Body; //正文
 87                 mMailMessage.BodyEncoding = System.Text.Encoding.UTF8; //正文的编码原则
 88                 mMailMessage.Priority = MailPriority; //优先级
 89 
 90                 if (AttachMentFileList != null && AttachMentFileList.Count() != 0)  //判断是否有附件
 91                 {
 92                     foreach (var item in AttachMentFileList)
 93                     {
 94                         Attachment mAttachment = new Attachment(item.FilePath); //添加文件的文职
 95                         mAttachment.Name = item.FileName;//附件显示的文件名称
 96                         mAttachment.NameEncoding = System.Text.Encoding.UTF8;
 97                         mAttachment.TransferEncoding = System.Net.Mime.TransferEncoding.Base64;
 98                         mAttachment.ContentDisposition.Inline = true;
 99                         mAttachment.ContentDisposition.DispositionType = System.Net.Mime.DispositionTypeNames.Attachment;
100                         mMailMessage.Attachments.Add(mAttachment);
101                     }
102                 }
103 
104                 mSmtpClient.Send(mMailMessage);
105                 return "发送成功!";
106 
107             }
108             catch (Exception ex)
109             {
110                 return ex.Message;
111             }
112         }
113 
114         public string SendMail(String ServerIP, string UserName, string Password, string FromAddress, string FromAddressName, string Subject, string Body, List<string> ToAddressList)
115         {
116             return SendMail(ServerIP, null, UserName, Password, FromAddress, FromAddressName, Subject, Body, ToAddressList, null, null, false, null, MailPriority.Normal);
117         }
118     }
119     public  class AttachmentFile
120     {
121         /// <summary>
122         /// 文件路径
123         /// </summary>
124         public string FilePath { get; set; }
125         /// <summary>
126         ///附件显示的文件明
127         /// </summary>
128         public string FileName { get; set; }
129     }