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       在KS系统中有个发送邮件的功能需要做上网查阅资料以后，通过自己的部分修改实现了发送邮件的功能话不多说先来个界面：

 

邮件发送分一下步骤：

1.smtp服务信息设置

2.验证发件人信息

3.添加附件

4.正式发送邮件

5.发送邮件后处理

 

1.smtp服务信息设置

   #region 设置Ｓmtp服务器信息/// <summary>/// 设置Ｓmtp服务器信息/// </summary>/// <param name="ServerName">SMTP服务名</param>/// <param name="Port">端口号</param>private void setSmtpClient(string ServerHost, int Port){SmtpClient = new SmtpClient();SmtpClient.Host = ServerHost;//指定SMTP服务名  例如QQ邮箱为 smtp.qq.com 新浪cn邮箱为 smtp.sina.cn等SmtpClient.Port = Port; //指定端口号SmtpClient.Timeout = 0;  //超时时间}#endregion

 

2.验证发件人信息

        #region 验证发件人信息/// <summary>/// 验证发件人信息/// </summary>/// <param name="MailAddress">发件邮箱地址</param>/// <param name="MailPwd">邮箱密码</param>private void setAddressform(string MailAddress, string MailPwd){//创建服务器认证NetworkCredential NetworkCredential_my = new NetworkCredential(MailAddress, MailPwd);//实例化发件人地址MailAddress_from = new System.Net.Mail.MailAddress(MailAddress, textBoxX4.Text);//指定发件人信息  包括邮箱地址和邮箱密码SmtpClient.Credentials = new System.Net.NetworkCredential(MailAddress_from.Address, MailPwd);;}#endregion

 

3.添加附件

  #region 检测附件大小private bool Attachment_MaiInit(string path){try{FileStream_my = new FileStream(path, FileMode.Open);string name = FileStream_my.Name;int size = (int)(FileStream_my.Length / 1024 / 1024);FileStream_my.Close();//控制文件大小不大于10Ｍif (size > 10){MessageBox.Show("文件长度不能大于10M！你选择的文件大小为" + size.ToString() + "M", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning);return false;}return true;}catch (IOException E){MessageBox.Show(E.Message);return false;}}#endregion

 

4.正式发送邮件

        private void btnSend_Click_1(object sender, EventArgs e){if (txt_SmtpServer.Text == ""){MessageBox.Show("请输入SMTP服务器名！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);return;}if (textBoxX2.Text == ""){MessageBox.Show("请输入发件人邮箱地址！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);return;}if (txtformPwd.Text == ""){MessageBox.Show("请输入发件人邮箱密码！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);return;}if (MessageBox.Show("您确定要发送当前邮件吗？", "询问", MessageBoxButtons.OKCancel, MessageBoxIcon.Question) == DialogResult.OK){try{//初始化Ｓmtp服务器信息setSmtpClient("smtp." + txt_SmtpServer.Text.Trim() + comboBoxEx3.Text, Convert.ToInt32(numericUpDown1.Text));}catch (Exception Ex){MessageBox.Show("邮件发送失败,请确定SMTP服务名是否正确！" + "\n" + "技术信息:\n" + Ex.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);return;}try{//验证发件邮箱地址和密码setAddressform(textBoxX2.Text.Trim() + comboBoxEx2.Text, txtformPwd.Text.Trim());}catch (Exception Ex){MessageBox.Show("邮件发送失败,请确定发件邮箱地址和密码的正确性！" + "\n" + "技术信息:\n" + Ex.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);return;}//清空历史发送信息 以防发送时收件人收到的错误信息(收件人列表会不断重复)MailMessage_Mai = new MailMessage(); MailMessage_Mai.To.Clear();//添加收件人邮箱地址MailAddress_to = new MailAddress(textBox4.Text.Trim() + comboBox4.Text.Trim());MailMessage_Mai.To.Add(MailAddress_to);//发件人邮箱MailMessage_Mai.From = MailAddress_from;//邮件主题MailMessage_Mai.Subject = txttitle.Text;MailMessage_Mai.SubjectEncoding = System.Text.Encoding.UTF8;//邮件正文MailMessage_Mai.Body = Rtb_Message.Text;MailMessage_Mai.BodyEncoding = System.Text.Encoding.UTF8;//清空历史附件  以防附件重复发送MailMessage_Mai.Attachments.Clear();//注册邮件发送完毕后的处理事件SmtpClient.SendCompleted += new SendCompletedEventHandler(SendCompletedCallback);//开始发送邮件SmtpClient.SendAsync(MailMessage_Mai, "000000000");}}

 

5.发送邮件后处理

 #region 发送邮件后所处理的函数private static void SendCompletedCallback(object sender, AsyncCompletedEventArgs e){try{if (e.Cancelled){MessageBox.Show("发送已取消！");}if (e.Error != null){MessageBox.Show("邮件发送失败！" + "\n" + "技术信息:\n" + e.ToString(), "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);}else{MessageBox.Show("邮件成功发出!", "恭喜!", MessageBoxButtons.OK, MessageBoxIcon.Information);}}catch (Exception Ex){MessageBox.Show("邮件发送失败！" + "\n" + "技术信息:\n" + Ex.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);}}#endregion

 

参考资料连接：http://www.cnblogs.com/maiweibiao/articles/1837821.html

 代码：http://download.csdn.net/detail/gwblue/6353807