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sendstring = "USER " this.txtusername.Text "\r\n";//存储用户名
bufferstring = Encoding.GetEncoding("gb2312").GetBytes(sendstring.ToCharArray());
networkstream.Write(bufferstring, 0, bufferstring.Length);//将用户名发送到服务器
richTextBox1.AppendText(streamreader.ReadLine() "\r\n");//将用用户显示在 richTextBox控件中
sendstring = "PASS " this.txtpwd.Text "\r\n";//存储用户密码
bufferstring = Encoding.GetEncoding("gb2312").GetBytes(sendstring.ToCharArray());
networkstream.Write(bufferstring, 0, bufferstring.Length);//将用户密码发送到服务器
richTextBox1.AppendText(streamreader.ReadLine() "\r\n");
sendstring = "STAT " "\r\n";//储存从服务器获得所有信息序号和字节数命令
bufferstring = Encoding.GetEncoding("utf-8").GetBytes(sendstring.ToCharArray());
networkstream.Write(bufferstring, 0, bufferstring.Length);//从服务器获得所有信息序号和字节数
string strResult=streamreader.ReadLine();//读取从服务器返回的数据
if (strResult.IndexOf('-') == -1)
{
richTextBox1.AppendText(strResult "\r\n");
sendstring = "LIST " "\r\n";//存储从服务器中获得信息列表和大小的命令
bufferstring = Encoding.GetEncoding("gb2312").GetBytes(sendstring.ToCharArray());
networkstream.Write(bufferstring, 0, bufferstring.Length);
string strInfo = streamreader.ReadLine();
string[] str = strInfo.Split(' ');
richTextBox1.AppendText("邮件数量:" str[1] "\r\n");
richTextBox1.AppendText(str[1] ":封邮件总容量为" str[2] "\r\n");
MessageBox.Show(this.txtusername.Text "用户您好!!!");
button1.Enabled = true;
//将光标置回原来的状态
Cursor.Current = cr;
button4.Enabled = true;
button2.Enabled = false;