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();  }  //打開上傳附件的對話框  private void btnUP_Click(object sender, EventArgs e)  {   oFDialogSFile.InitialDirectory = "C://";//設置對話框的初始目錄為C盤    oFDialogSFile.Filter = "all files (*.*)|*.*";//篩選字符串為所有文件    oFDialogSFile.RestoreDirectory = true;   oFDialogSFile.ShowDialog();   cboxAccessories.Items.Add(oFDialogSFile.FileName.Trim());//當選擇好文件后將文件名賦值給下拉框  }  //發送郵件  private void btnSend_Click(object sender, EventArgs e)  {    try    {     string file = Application.StartupPath + "testXML.xml";     //SmtpClient下的一個對象，用以設置郵件的主題和內容      System.Net.Mail.MailMessage myMail = new System.Net.Mail.MailMessage();     //發送端到接收端的郵箱地址      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++)      { //建立郵件附件類的一個對象，語法格式為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協議下的一個對象，用以設置附件的創建時間，修改時間以及讀取時間       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對象里attachments屬性，添加上面設置好的myattachment       myMail.Attachments.Add(myAttachment);      }     }     //建立發送對象client,驗證郵件服務器，服務器端口，用戶名，以及密碼     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("郵件發送成功！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);    }    catch (Exception ex)    {     MessageBox.Show(ex.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);    }   }  private void 刪除上傳文件_Click(object sender, EventArgs e)  {   if (cboxAccessories.Text == "")   {    MessageBox.Show("沒有附件可刪！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);   }   else   {    cboxAccessories.Items.Remove(cboxAccessories.Text.Trim());   }  }  }}