08-网络操作/调用SMTP发送有附件的邮件/SEmailWithAtt/frmSend.cs

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using System;
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;
using System.Net.Mail;
using System.Text.RegularExpressions;

namespace SEmailWithAtt
{
    public partial class frmSend : Form
    {
        public frmSend()
        {
            InitializeComponent();
        }
        //对邮件内容进行编码
        private static string Base64Encode(string str)
        {
            return Convert.ToBase64String(Encoding.UTF8.GetBytes(str));
        }

        private void AddFile(string strFile,MailMessage message)
        {
            //为要发送的邮件创建附件信息
            Attachment myAttachment = new Attachment(strFile, System.Net.Mime.MediaTypeNames.Application.Octet);
            //为附件添加时间信息
            System.Net.Mime.ContentDisposition disposition = myAttachment.ContentDisposition;
            disposition.CreationDate = System.IO.File.GetCreationTime(strFile);
            disposition.ModificationDate = System.IO.File.GetLastWriteTime(strFile);
            disposition.ReadDate = System.IO.File.GetLastAccessTime(strFile);
            message.Attachments.Add(myAttachment);			//将创建的附件添加到邮件中
        }

        private void SendEmail(MailMessage message)
        {
            message.Subject = Base64Encode(txtSubject.Text);    //设置发送邮件的主题
            message.Body = Base64Encode(txtContent.Text);       //设置发送邮件的内容
            if (txtAttachment.Text != "")
            {
                if (txtAttachment.Text.IndexOf(",") != 0)
                {
                    string[] strAttachment = txtAttachment.Text.Split(',');
                    for (int i = 0; i < strAttachment.Length; i++)
                    {
                        AddFile(strAttachment[i], message);
                    }
                }
                else
                {
                    AddFile(txtAttachment.Text, message);
                }
            }
            //实例化SmtpClient邮件发送类对象
            SmtpClient client = new SmtpClient(txtServer.Text, Convert.ToInt32(txtPort.Text));
            //设置用于验证发件人身份的凭据