邮件怎么发不出去呢。。。

Question

using System.Net;
using System.Net.Sockets;
using System.IO;
public TcpClient Server;
public NetworkStream NetStrm;
public StreamReader  RdStrm;
publicstring Data;
publicbyte[] szData;
publicstring CRLF = "\r\n";
 privatevoid Connect_Click(object sender, System.EventArgs e)
              {
                     //将光标置为等待状态
                     Cursor cr = Cursor.Current;
                     Cursor.Current = Cursors.WaitCursor;
 
                     //用110端口新建POP3服务器连接
                     Server = new TcpClient(PopServer.Text,110);                                                 
                     Status.Items.Clear();
 
                     try
                     {
                            //初始化
                            NetStrm = Server.GetStream();
                            RdStrm= new StreamReader(Server.GetStream());
                            Status.Items.Add(RdStrm.ReadLine());
 
                            //登录服务器过程
                            Data = "USER "+ Username.Text+CRLF;                          
                            szData = System.Text.Encoding.ASCII.GetBytes(Data.ToCharArray());
                            NetStrm.Write(szData,0,szData.Length);
                            Status.Items.Add(RdStrm.ReadLine());
 
                            Data = "PASS "+ Password.Text+CRLF;                          
                            szData = System.Text.Encoding.ASCII.GetBytes(Data.ToCharArray());
                            NetStrm.Write(szData,0,szData.Length);
                            Status.Items.Add(RdStrm.ReadLine());
 
                            //向服务器发送STAT命令，从而取得邮箱的相关信息：邮件数量和大小
                            Data = "STAT"+CRLF;                            
                            szData = System.Text.Encoding.ASCII.GetBytes(Data.ToCharArray());
                            NetStrm.Write(szData,0,szData.Length);
                            Status.Items.Add(RdStrm.ReadLine());
 
                            //改变按钮的状态
                            Connect.Enabled = false;
                            Disconnect.Enabled = true;
                            Retrieve.Enabled = true;
 
                            //将光标置回原来的状态
                            Cursor.Current = cr;
 
                     }
                     catch(InvalidOperationException err)
                     {
                            Status.Items.Add("Error: "+err.ToString());
                     }
       }

Answer 1

privatevoid Disconnect_Click(object sender, System.EventArgs e)
              {
                     //将光标置为等待状态
                     Cursor cr = Cursor.Current;
                     Cursor.Current = Cursors.WaitCursor;
 
                     //向服务器发送QUIT命令从而结束和POP3服务器的会话
                     Data = "QUIT"+CRLF;                            
                     szData = System.Text.Encoding.ASCII.GetBytes(Data.ToCharArray());
                     NetStrm.Write(szData,0,szData.Length);
                     Status.Items.Add(RdStrm.ReadLine());
 
                     //断开连接
                     NetStrm.Close();
                     RdStrm.Close();
 
                     //改变按钮的状态
                     Connect.Enabled = true;
                     Disconnect.Enabled = false;
                     Retrieve.Enabled = false;
 
                     //将光标置回原来的状态
                     Cursor.Current = cr;
              }
 

Answer 2

privatevoid Retrieve_Click(object sender, System.EventArgs e)
              {
                     //将光标置为等待状态
                     Cursor cr = Cursor.Current;
                     Cursor.Current = Cursors.WaitCursor;  
                     string szTemp;                                     
                     Message.Clear();
 
                     try
                     {
                            //根据邮件编号从服务器获得相应邮件
                            Data = "RETR "+ MailNum.Text+CRLF;                          
                            szData = System.Text.Encoding.ASCII.GetBytes(Data.ToCharArray());
                            NetStrm.Write(szData,0,szData.Length);
                            szTemp = RdStrm.ReadLine();
 
                            if(szTemp[0]!='-') 
                            {
                                   //不断地读取邮件内容，只到结束标志：英文句号
                                   while(szTemp!=".")
                                   {
                                          Message.Text += szTemp;
                                          szTemp = RdStrm.ReadLine();
                                   }
 
                                   //若BackupChBox未选中，则收取邮件后，删除保留在服务器上的邮件
                                   if(BackupChBox.Checked == false)
                                   {
                                          Data = "DELE" + MailNum.Text + CRLF;
                                          szData = System.Text.Encoding.ASCII.GetBytes(Data.ToCharArray());
                                          NetStrm.Write(szData,0,szData.Length);
                                          Status.Items.Add(RdStrm.ReadLine());
                                   }
                            }
                            else
                            {
                                   Status.Items.Add(szTemp);
                            }
                                                 
                            //将光标置回原来的状态
                            Cursor.Current = cr;
                     }
 
                     catch(InvalidOperationException err)
                     {
                            Status.Items.Add("Error: "+err.ToString());
                     }
              }
 

Answer 3

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