C# 附件上傳及發送電子郵件實例源代碼

具體的上傳頁面實現，請見下文：

看到上傳頁面，控件很少：1個FileUpload、4個TextBox和1個Button。通過VS的界面設計器直接拖放出來。還有隱藏的3個驗證控件：2個Request和1個郵件格式驗證。

按鈕OnClick事件代碼：

 protected void btnUpload_Click(object sender, EventArgs e)
        {           
            string mess = "Nickname: "+txtNickname.Text + "<br />Link: " + txtLink.Text+"<br />Comments: "+txtComments.Text;
            try
            {
                SendMail("[email protected]", "[email protected]", fuFile.FileName + " uploaded", mess, txtEmail.Text, true, fuFile.FileName, fuFile.FileBytes, "smtphost", "username", "password");
                Response.Redirect("upload_thankyou.html",true);
            }
            catch(Exception ex)
            {
                lblMsg.Text = ex.Message;
            }
        }

通過fuFile.FileBytes得到客戶端上傳的文件內容，並調用SendMail函數發送附件到指定的郵箱。SendMail代碼如下：

  public static void SendMail(string from, string to, string subject, string message, string replyto, bool hasatt, string filename, byte[] att, string host, string username, string password)
        {
            MailMessage em = new MailMessage(from, to);
            em.Subject = subject;
            em.Body = message;
            em.IsBodyHtml = true;
            if (replyto.Length > 0) em.ReplyTo = new MailAddress(replyto);
            if (hasatt)
            {
                Stream s = (Stream)(new MemoryStream(att));
                em.Attachments.Add(new Attachment(s, filename));
            }
            SmtpClient sc = new SmtpClient(host);
            sc.DeliveryMethod = SmtpDeliveryMethod.Network;
            System.Net.NetworkCredential oCredential = new System.Net.NetworkCredential(username, password);
            sc.UseDefaultCredentials = false;
            sc.Credentials = oCredential;
            sc.Send(em);
        }

發送完畢跳到Thankyou頁面，大約三五分鐘後指定的郵箱就收到附件了。

來源：http://siguchuan.blog.163.com/blog/static/953551872010101132353328/