求接收邮件的代码，用.NET的自带类库

Question

求接收邮件的代码，用.NET的自带类库

Answer 1

System.Net.Mail 命名空间包含用于将电子邮件发送到简单邮件传输协议 (SMTP) 服务器进行传送的类。 MailMessage 类表示邮件的内容。SmtpClient 类将电子邮件传输到您指定用于邮件传送的 SMTP 主机。可以使用 Attachment 类创建邮件附件。

Answer 2

using System;
using System.Net;
using System.Net.Mail;
using System.Net.Mime;
using System.Threading;
using System.Net.Sockets;
using System.IO;
using System.Collections;
using System.Collections.Generic;
using System.Net.Configuration;
using System.Configuration;
    #region 邮件接收类    /// <summary>
    /// 邮件接收类
    /// </summary>
    public class POP3
    {
        #region Fields        string POPServer;
        string mPOPUserName;
        string mPOPPass;
        int mPOPPort;
        NetworkStream ns;
        StreamReader sr;        #endregion        #region Constructors        /// <summary>
        /// POP3
        /// </summary>
        /// <param name="server">POP3服务器名称</param>
        /// <param name="userName">用户名</param>
        /// <param name="password">用户密码</param>
        public POP3(string server, string userName, string password)
            : this(server, 110, userName, password)
        {
        }        /// <summary>
        /// POP3
        /// </summary>
        /// <param name="server">POP3服务器名称</param>
        /// <param name="port">端口号</param>
        /// <param name="userName">用户名</param>
        /// <param name="password">用户密码</param>
        public POP3(string server, int port, string userName, string password)
        {
            POPServer = server;
            mPOPUserName = userName;
            mPOPPass = password;
            mPOPPort = port;
        }        #endregion        #region Methods        #region Public        /// <summary>
        /// 获得新邮件数量
        /// </summary>
        /// <returns>新邮件数量</returns>
        public int GetNumberOfNewMessages()
        {
            byte[] outbytes;
            string input;            try
            {
                Connect();                input = "stat" + "\r\n";
                outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
                ns.Write(outbytes, 0, outbytes.Length);
                string resp = sr.ReadLine();
                string[] tokens = resp.Split(new Char[] { ' ' });                Disconnect();                return Convert.ToInt32(tokens[1]);
            }
            catch
            {
                return -1;
            }
        }        /// <summary>
        /// 获取新邮件内容
        /// </summary>
        /// <param name="subj">邮件主题</param>
        /// <returns>新邮件内容</returns>
        public List<MailMessage> GetNewMessages(string subj)
        {            int newcount;
            List<MailMessage> newmsgs = new List<MailMessage>();            try
            {
                newcount = GetNumberOfNewMessages();
                Connect();                for (int n = 1; n < newcount + 1; n++)
                {
                    List<string> msglines = GetRawMessage(n);
                    string msgsubj = GetMessageSubject(msglines);
                    if (msgsubj.CompareTo(subj) == 0)
                    {
                        MailMessage msg = new MailMessage();
                        msg.Subject = msgsubj;
                        msg.From = new MailAddress(GetMessageFrom(msglines));
                        msg.Body = GetMessageBody(msglines);
                        newmsgs.Add(msg);
                        DeleteMessage(n);
                    }
                }                Disconnect();
                return newmsgs;
            }
            catch (Exception e)
            {
                return newmsgs;
            }
        }       

Answer 3

///接上面
 /// <summary>
        /// 获取新邮件内容
        /// </summary>
        /// <param name="nIndex">新邮件索引</param>
        /// <returns>新邮件内容</returns>
        public MailMessage GetNewMessages(int nIndex)
        {
            int newcount;
            MailMessage msg = new MailMessage();            try
            {
                newcount = GetNumberOfNewMessages();
                Connect();
                int n = nIndex + 1;                if (n < newcount + 1)
                {
                    List<string> msglines = GetRawMessage(n);
                    string msgsubj = GetMessageSubject(msglines);
                    msg.Subject = msgsubj;
                    msg.From = new MailAddress(GetMessageFrom(msglines));
                    msg.Body = GetMessageBody(msglines);
                }                Disconnect();
                return msg;
            }
            catch
            {
                return null;
            }
        }        #endregion        #region Private        private bool Connect()
        {
            TcpClient sender = new TcpClient(POPServer, mPOPPort);
            byte[] outbytes;
            string input;            try
            {
                ns = sender.GetStream();
                sr = new StreamReader(ns);                sr.ReadLine();
                input = "user " + mPOPUserName + "\r\n";
                outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
                ns.Write(outbytes, 0, outbytes.Length);
                sr.ReadLine();                input = "pass " + mPOPPass + "\r\n";
                outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
                ns.Write(outbytes, 0, outbytes.Length);
                sr.ReadLine();
                return true;            }
            catch
            {
                return false;
            }
        }        private void Disconnect()
        {
            string input = "quit" + "\r\n";
            Byte[] outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
            ns.Write(outbytes, 0, outbytes.Length);
            ns.Close();
        }        private List<string> GetRawMessage(int messagenumber)
        {
            Byte[] outbytes;
            string input;
            string line = "";            input = "retr " + messagenumber.ToString() + "\r\n";
            outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
            ns.Write(outbytes, 0, outbytes.Length);            List<string> msglines = new List<string>();
            do
            {
                line = sr.ReadLine();
                msglines.Add(line);
            } while (line != ".");
            msglines.RemoveAt(msglines.Count - 1);            return msglines;
        }        private string GetMessageSubject(List<string> msglines)
        {
            string[] tokens;
            IEnumerator msgenum = msglines.GetEnumerator();
            while (msgenum.MoveNext())
            {
                string line = (string)msgenum.Current;
                if (line.StartsWith("Subject:"))
                {
                    tokens = line.Split(new Char[] { ' ' });
                    return tokens[1].Trim();
                }
            }
            return "None";
        }        private string GetMessageFrom(List<string> msglines)
        {
            string[] tokens;
            IEnumerator msgenum = msglines.GetEnumerator();
            while (msgenum.MoveNext())
            {
                string line = (string)msgenum.Current;
                if (line.StartsWith("From:"))
                {
                    tokens = line.Split(new Char[] { '<' });
                    return tokens[1].Trim(new Char[] { '<', '>' });
                }
            }
            return "None";
        }        private string GetMessageBody(List<string> msglines)
        {
            string body = "";
            string line = " ";
            IEnumerator msgenum = msglines.GetEnumerator();            while (line.CompareTo("") != 0)
            {
                msgenum.MoveNext();
                line = (string)msgenum.Current;
            }            while (msgenum.MoveNext())
            {
                body = body + (string)msgenum.Current + "\r\n";
            }
            return body;
        }        private void DeleteMessage(int messagenumber)
        {
            Byte[] outbytes;
            string input;            try
            {
                input = "dele " + messagenumber.ToString() + "\r\n";
                outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
                ns.Write(outbytes, 0, outbytes.Length);
            }
            catch (Exception e)
            {
                return;
            }        }        #endregion        #endregion
    }    #endregion

Answer 4

可以参考一下OpenPOP，感觉做得不错，开源的