本文主要是介绍C#笔记8——多功能电子邮件发送程序实例，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
C#笔记8——多功能电子邮件发送程序实例
最近需要使用C#发邮件的功能，利用QQ邮件服务器发送邮件，包含发送邮件功能，MD5加密解密功能，自动加载、保存用户信息功能，非常适用于项目中的一些小功能！
效果图如下：
发送邮件
邮箱接收情况
源代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
//for send mail
using System.Net.Mail;
using System.Net;
using System.Threading;
using System.Text.RegularExpressions;
//for RD、WR
using System.IO;
//for Json
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
//for MD5
using System.Security.Cryptography;namespace MyEmail
{public partial class Form1 : Form{public Form1(){InitializeComponent();}private void btn_send_Click(object sender, EventArgs e){if (tb_sender_addr.Text == ""){MessageBox.Show("发件人邮箱地址不能为空！\n");return;}else {if (!MatchEmailAddr(tb_sender_addr.Text)){MessageBox.Show("发件人邮箱格式不正确，请重新输入！");tb_sender_addr.Clear();return;}}if (tb_sender_pwd.Text == ""){MessageBox.Show("发件人邮箱密码不能为空！\n");return;}if (tb_receiver_addr.Text == ""){MessageBox.Show("收件人邮箱地址不能为空!\n");return;}else{if (!MatchEmailAddr(tb_receiver_addr.Text)){MessageBox.Show("收件人邮箱格式不正确，请重新输入！");tb_receiver_addr.Clear();return;}}if (tb_theme.Text == ""){MessageBox.Show("邮件主题不能为空！");return;}if (rtb_content.Text == ""){DialogResult dr1 = MessageBox.Show("请选择是否发送！\n", "邮件内容为空！", MessageBoxButtons.YesNo);if (dr1 == DialogResult.Yes){send_email(tb_sender_addr.Text, tb_receiver_addr.Text, tb_sender_pwd.Text, tb_theme.Text, rtb_content.Text);}else if (dr1 == DialogResult.No){lab_log.Text = GetCurrentTime() + " 内容为空，取消发送!";return;}else{return;}}else{send_email(tb_sender_addr.Text, tb_receiver_addr.Text, tb_sender_pwd.Text, tb_theme.Text, rtb_content.Text);}}private void btn_exit_Click(object sender, EventArgs e){SaveUserMessage(tb_sender_addr.Text,tb_receiver_addr.Text,tb_sender_pwd.Text,tb_theme.Text,rtb_content.Text);//关闭与该程序相关所有线程System.Environment.Exit(System.Environment.ExitCode);}private void Form1_Load(object sender, EventArgs e){LoadUserMessage();}#region send mail//参数说明：发件人地址，收件人地址，发件人邮箱密码，邮件主题，邮件内容private void send_email(string email_sender_addr, string email_receiver_addr, string email_sender_pwd, string email_subject, string email_content){//使用QQ邮件服务器发送邮件try{SmtpClient smtp = new SmtpClient();smtp.EnableSsl = true;smtp.UseDefaultCredentials = false;smtp.DeliveryMethod = SmtpDeliveryMethod.Network;//指定电子邮件发送方式smtp.Host = "smtp.qq.com";//指定SMTP服务器smtp.Credentials = new NetworkCredential(email_sender_addr, email_sender_pwd);//发件人邮箱地址和密码#region 邮件内容MailMessage MyMail = new MailMessage(email_sender_addr, email_receiver_addr);//发件人和收件人/* MailMessage MyMail = new MailMessage();MyMail.From = new MailAddress("690605677@qq.com");MyMail.To.Add(new MailAddress(email_addr));以上等价于MailMessage MyMail = new MailMessage(email_sender_addr,email_receiver_addr);*/MyMail.Subject = email_subject;MyMail.SubjectEncoding = Encoding.UTF8;MyMail.Body = email_content;MyMail.BodyEncoding = Encoding.UTF8;MyMail.IsBodyHtml = true;MyMail.Priority = MailPriority.Low;#endregionsmtp.Send(MyMail);lab_log.Text = GetCurrentTime() + " 发送邮件成功！";}catch (Exception e){MessageBox.Show("发送邮件出错：\n" + e.ToString());lab_log.Text = GetCurrentTime() + " 发送邮件出错！";return;}}#endregion//获取当前时间private string GetCurrentTime(){string ct = null;DateTime dt = new System.DateTime();dt = System.DateTime.Now;ct = dt.ToString();return ct;}//匹配邮箱地址private bool MatchEmailAddr(string EmailAddr){bool EmailStatus = false;//正则表达式字符串string emailStr = @"([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,5})+";//邮箱正则表达式对象Regex emailReg = new Regex(emailStr);if (emailReg.IsMatch(EmailAddr.Trim())){EmailStatus = true; ;}else{lab_log.Text = "输入的不是有效的邮件地址格式";EmailStatus = false;}return EmailStatus;}//保存用户信息private void SaveUserMessage(string email_sender_addr, string email_receiver_addr, string email_sender_pwd, string email_subject, string email_content){try {if (!File.Exists("./UserMsg.txt")){FileStream fs = File.Create("./UserMsg.txt");fs.Close();StreamWriter sw = new StreamWriter("./UserMsg.txt", false, System.Text.Encoding.GetEncoding("utf-8"));string content = GetUserMsg_json(tb_sender_addr.Text, tb_sender_pwd.Text, tb_receiver_addr.Text, tb_theme.Text, rtb_content.Text);sw.WriteLine(content);sw.Close();sw.Dispose();}else{StreamWriter sw = new StreamWriter("./UserMsg.txt", false, System.Text.Encoding.GetEncoding("utf-8"));string content = GetUserMsg_json(tb_sender_addr.Text, tb_receiver_addr.Text, tb_sender_pwd.Text, tb_theme.Text, rtb_content.Text);sw.WriteLine(content);sw.Close();sw.Dispose();}}catch {lab_log.Text = GetCurrentTime() + " 保存用户信息出错！";}}//加载用户信息private void LoadUserMessage(){if (File.Exists("./UserMsg.txt")){StreamReader sw = new StreamReader("./UserMsg.txt", System.Text.Encoding.GetEncoding("utf-8"), false);string str = null;str = sw.ReadToEnd();//MessageBox.Show("read:\n" + str);sw.Close();sw.Dispose();try{JObject job = new JObject();job = JObject.Parse(str);this.tb_sender_addr.Text = job["sender_addr"].ToString();this.tb_receiver_addr.Text = job["receiver_addr"].ToString();this.tb_sender_pwd.Text = MD5Decrypt(job["sender_pwd"].ToString());this.tb_theme.Text = job["subject"].ToString();this.rtb_content.Text = job["content"].ToString();}catch{lab_log.Text = GetCurrentTime() + " 加载用户信息失败！";}}}//将用户信息转为Json数据private string GetUserMsg_json(string email_sender_addr, string email_receiver_addr, string email_sender_pwd, string email_subject, string email_content){string retmsg = null;try {JObject job = new JObject();job.Add(new JProperty("sender_addr",email_sender_addr));job.Add(new JProperty("receiver_addr", email_receiver_addr));job.Add(new JProperty("sender_pwd", MD5Encrypt(email_sender_pwd)));job.Add(new JProperty("subject", email_subject));job.Add(new JProperty("content", email_content));retmsg = job.ToString();}catch{lab_log.Text = GetCurrentTime() + " Json 数据出错！";}return retmsg;}//MD5加密private string MD5Encrypt(string data){string retmsg = null;string KEY_64 = "VavicApp";string IV_64 = "VavicApp";try{byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();int i = cryptoProvider.KeySize;MemoryStream ms = new MemoryStream();CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);StreamWriter sw = new StreamWriter(cst);sw.Write(data);sw.Flush();cst.FlushFinalBlock();sw.Flush();retmsg = Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);sw.Close();}catch (Exception x){MessageBox.Show("MD5 加密出错:\n"+x.Message);lab_log.Text = GetCurrentTime() + " MD5 加密出错！";}return retmsg;} //MD5解密private string MD5Decrypt(string data){string retmsg = null;string KEY_64 = "VavicApp";string IV_64 = "VavicApp"; try{byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);byte[] byEnc;byEnc = Convert.FromBase64String(data); //把需要解密的字符串转为8位无符号数组DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();MemoryStream ms = new MemoryStream(byEnc);CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read);StreamReader sr = new StreamReader(cst);retmsg = sr.ReadToEnd();sr.Close();}catch (Exception x){MessageBox.Show("MD5 解密出错误：\n"+x.Message);lab_log.Text = GetCurrentTime() + " MD5 解密出错误!";}return retmsg;} //关闭窗口事件private void FormCloseingAll(object sender, FormClosingEventArgs e){SaveUserMessage(tb_sender_addr.Text, tb_receiver_addr.Text, tb_sender_pwd.Text, tb_theme.Text, rtb_content.Text);//关闭所有线程System.Environment.Exit(System.Environment.ExitCode);} }
}
本实例源代码：
http://download.csdn.net/download/u011127242/9714085
若使用非qq邮箱向其它邮箱发邮件会导致发送失败，使用qq邮箱向其它任何邮箱(用gmail测试ok)都可以发送邮件的，所以使用的时候需要注意一下！一般的邮箱服务都只为自己的用户提供服务，所以非QQ邮箱是无法登陆到QQ邮箱客户端查看邮件信息的，更别说借用其服务发邮件了！
如果想实现任意邮箱发送的功能，可以指定多个SMTP服务器（smtp.Host = "smtp.qq.com";//指定SMTP服务器）和对应的发送方式，发送之前根据邮箱地址判断邮箱类型，然后使用对应的SMTP服务就可以了,当然前提是你需要知道那么多的SMTP服务器地址，而且它们都对外开放了相应的接口才行！如果有兴趣的话可以试着做一下！
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