基于 .NET 2.0 System.Net.Mail namespace 的邮件发送组件

一个基于 .NET 2.0 System.Net.Mail namespace 的邮件发送接收组件，参考了以前网上一些基于 System.Web.Mail namespace 例子。

/**//********************************************
 * 
 * description: 基于 .NET 2.0 System.Net.Mail namespace 
 *              的邮件发送接收组件 
 * 
 * author:      yyw84
 * 
 * blogs:       http://yyw84.cnblogs.com/
 * 
 * Date:        2006-5-4 
 * 
 ********************************************/

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;

namespace Mailer.Components
{
    邮件接收类#region 邮件接收类

    /**//// <summary>
    /// 邮件接收类
    /// </summary>
    public class POP3
    {
        Fields#region Fields

        string POPServer;
        string mPOPUserName;
        string mPOPPass;
        int mPOPPort;
        NetworkStream ns;
        StreamReader sr;

        #endregion

        Constructors#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

        Methods#region Methods

        Public#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;
            }
        }

        /**//// <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)