ASP.NET读取POP3邮件的操作

e not = TRANSACTION";
   }
   else
   {
   issue_command("DELE " + msg_number.ToString ());
   temp=read_single_line_response();
   }
   return(temp);
   }
  
   public string LIST()
   {
   string temp="";
   if (state != connect_state.TRANSACTION )
   {
   //the pop command LIST is only valid in the TRANSACTION state
   temp="Connection state not = TRANSACTION";
   }
   else
   {
   issue_command ("LIST");
   temp=read_multi_line_response();
   }
   return(temp);
   }
  
   public string LIST(int msg_number)
   {
   string temp="";
  
   if (state != connect_state.TRANSACTION )
   {
   //the pop command LIST is only valid in the TRANSACTION state
   temp="Connection state not = TRANSACTION";
   }
   else
   {
   issue_command ("LIST " + msg_number.ToString ());
   temp=read_single_line_response(); //when the message number is supplied, expect a single line response
   }
   return(temp);
  
   }
  
   public string NOOP()
   {
   string temp;
   if (state != connect_state.TRANSACTION )
   {
   //the pop command NOOP is only valid in the TRANSACTION state
   temp="Connection state not = TRANSACTION";
   }
   else
   {
   issue_command ("NOOP");
   temp=read_single_line_response();
  
   }
   return(temp);
  
   }
   public string PASS()
   {
   string temp;
   if (state != connect_state.AUTHORIZATION)
   {
   //the pop command PASS is only valid in the AUTHORIZATION state
   temp="Connection state not = AUTHORIZATION";
   }
   else
   {
   if (pwd !=null)
   {
   issue_command ("PASS " + pwd);
   temp=read_single_line_response();
  
   if (!error)
   {
   //transition to the Transaction state
   state=connect_state.TRANSACTION;
   }
   }
   else
   {
   temp="No Password set.";
   }
   }
   return(temp);
   }
   public string PASS(string password)
   {
   pwd=password; //put the supplied password into the appropriate property
   return(PASS()); //call PASS() with no arguement
   }
  
   public string QUIT()
   {
   //QUIT is valid in all pop states
  
   string temp;
   if (state !=connect_state.disc)
   {
   issue_command ("QUIT");
   temp=read_single_line_response();
   temp += CRLF + disconnect();
  
   }
   else
   {
   temp="Not Connected.";
   }
   return(temp);
  
   }
   public string RETR (int msg)
   {
   string temp="";
   if (state != connect_state.TRANSACTION )
   {
   //the pop command RETR is only valid in the TRANSACTION state
   temp="Connection state not = TRANSACTION";
   }
   else
   {
   // retrieve mail with number mail parameter
   issue_command ("RETR "+ msg.ToString ());
   temp=read_multi_line_response();
   }
   return(temp);
  
   }
  
   public string RSET()
   {
   string temp;
   if (state != connect_state.TRANSACTION )
   {
   //the pop command STAT is only valid in the TRANSACTION state
   temp="Connection state not = TRANSACTION";
   }
   else
   {
   issue_command("RSET");
   temp=read_single_line_response();
   }
   return(temp);
  
   }
  
   public string STAT()
   {
   string temp;
   if (state==connect_state.TRANSACTION)
   {
   issue_command("STAT");
   temp=read_single_line_response();
  
   return(temp);
   }
   else
  
   {
   //the pop command STAT is only valid in the TRANSACTION state
   return ("Connection state not = TRANSACTION");
   }
   }
  
   public string USER()
   {
   string temp;
   if (state != connect_state.AUTHORIZATION)
   {
   //the pop command USER is only valid in the AUTHORIZATION state
   temp="Connection state not = AUTHORIZATION";
   }
   else
   {
   if (user !=null)
   {
   issue_command("USER "+ user);
   temp=read_single_line_response();
   }
   else
   { //no user has been specified
   temp="No User specified.";
   }
   }
   return(temp);
   }
  
   public string USER(string user_name)
   {
   user=user_name; //put the user name in the appropriate propertity
   return(USER()); //call USER with no arguements
   }
   #endregion
   }
  
  }
  
  
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