C#编程实现发送邮件的方法(可添加附件)

using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Net.Mail;namespace WindowsFormsApplication63{ public partial class Form1 : Form {  public Form1()  {   InitializeComponent();  }  //打开上传附件的对话框  private void btnUP_Click(object sender, EventArgs e)  {   oFDialogSFile.InitialDirectory = "C://";//设置对话框的初始目录为C盘    oFDialogSFile.Filter = "all files (*.*)|*.*";//筛选字符串为所有文件    oFDialogSFile.RestoreDirectory = true;   oFDialogSFile.ShowDialog();   cboxAccessories.Items.Add(oFDialogSFile.FileName.Trim());//当选择好文件后将文件名赋值给下拉框  }  //发送邮件  private void btnSend_Click(object sender, EventArgs e)  {    try    {     string file = Application.StartupPath + "testXML.xml";     //SmtpClient下的一个对象，用以设置邮件的主题和内容      System.Net.Mail.MailMessage myMail = new System.Net.Mail.MailMessage();     //发送端到接收端的邮箱地址      myMail = new System.Net.Mail.MailMessage(txtSEmail.Text.Trim(), txtCEmail.Text.Trim());     myMail.Subject = txtETitle.Text.Trim();     myMail.Body = txtEContent.Text.Trim();     if (cboxAccessories.Items.Count > 0)     {      for (int i = 0; i < cboxAccessories.Items.Count; i++)      { //建立邮件附件类的一个对象，语法格式为System.Net.Mail.Attachment(文件名，文件格式)       System.Net.Mail.Attachment myAttachment = new System.Net.Mail.Attachment(       cboxAccessories.Items[i].ToString(), System.Net.Mime.MediaTypeNames.Application.Octet);       //MIME协议下的一个对象，用以设置附件的创建时间，修改时间以及读取时间       System.Net.Mime.ContentDisposition disposition = myAttachment.ContentDisposition;       disposition.CreationDate = System.IO.File.GetCreationTime(file);       disposition.ModificationDate = System.IO.File.GetLastWriteTime(file);       disposition.ReadDate = System.IO.File.GetLastAccessTime(file);       //用smtpclient对象里attachments属性，添加上面设置好的myattachment       myMail.Attachments.Add(myAttachment);      }     }     //建立发送对象client,验证邮件服务器，服务器端口，用户名，以及密码     System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient(txtSService.Text.Trim(), Convert.ToInt32(txtServicePort.Text.Trim()));     client.Credentials = new System.Net.NetworkCredential(txtUPwd.Text.Trim(), txtCEmail.Text.Trim());     client.Send(myMail);     MessageBox.Show("邮件发送成功！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);    }    catch (Exception ex)    {     MessageBox.Show(ex.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);    }   }  private void 删除上传文件_Click(object sender, EventArgs e)  {   if (cboxAccessories.Text == "")   {    MessageBox.Show("没有附件可删！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);   }   else   {    cboxAccessories.Items.Remove(cboxAccessories.Text.Trim());   }  }  }}