C#SOCKET类封装，可发送文字图片，断开自动连接(有问题)

自己的一个比较完整的功能

using System;using System.Collections.Generic;using System.ComponentModel;using System.Threading;using System.Text;using System.IO;using System.Data;using System.Drawing;using System.Net;using System.Net.Sockets;namespace NAL{    public delegate void ReceivedBitmapHandler(Bitmap bitmap);    public delegate void ReceivedMsgHandler(string str);    public class TransferHandler    {        private int port = 8089;        private IPEndPoint listenEP = null;        private IPEndPoint serverEP = null;        private Socket _listener = null;        private Socket remoteClient = null;        private Socket _client = null;        public event ReceivedBitmapHandler ReceivedBitmap;        public event ReceivedMsgHandler ReceivedMsg;        //初始化        public TransferHandler(Socket client)        {            _client = client;        }        //初始化IP，端口，SOCKET        public TransferHandler(string serverIP,int nport)        {            serverEP = new IPEndPoint(                IPAddress.Parse(serverIP),                port);            this.port = nport;        }        //监听        public void StartListen()        {            listenEP = new IPEndPoint(Dns.GetHostByName(Dns.GetHostName()).AddressList[0].Address, port);            _listener = new Socket(                AddressFamily.InterNetwork,                SocketType.Stream,                ProtocolType.Tcp);            _listener.Bind(listenEP);            _listener.Listen(-1);            _listener.BeginAccept(                new AsyncCallback(AcceptCallback),                null);        }        //监听回调        private void AcceptCallback(IAsyncResult iar)        {            try            {                remoteClient = _listener.EndAccept(iar);                this.BeginReceive();            }            catch (Exception err)            {                //客户端断开后，自动重新监听                _listener.BeginAccept(                new AsyncCallback(AcceptCallback),                null);                return;            }        }        //执行异步连接        public void BeginConnectServer()        {            _client = new Socket(                AddressFamily.InterNetwork,                SocketType.Stream,                ProtocolType.Tcp);            _client.BeginConnect(serverEP, new AsyncCallback(ConnectCallback), null);        }        //异步连接回调        private void ConnectCallback(IAsyncResult iar)        {            try            {                _client.EndConnect(iar);                this.BeginReceive();            }            catch (Exception err)            {                //获取连接异常，重新连接                _client.Close();                this.BeginConnectServer();                return;            }        }        //接收信息        public void BeginReceive()         {            byte[] buffer = new byte[9];            //由于long占8位字节，所以先获取前8位字节数据,标识位1位            IAsyncResult iar = _client.BeginReceive(                buffer,                0,                buffer.Length,                SocketFlags.None,                null,                null);            int len = _client.EndReceive(iar);            int offset = 1;            int length = BitConverter.ToInt32(buffer, offset);            if (buffer[0] == 0)            {                ReceiveMsg(length);            }            if (buffer[0] == 1)            {                //先获取文件长度                ReceiveFile(length);            }            BeginReceive();  //继续接收        }        //接收文件        private void ReceiveFile(long filelen)        {            MemoryStream ms = new MemoryStream();            int bytesRead = 0;            long count = 0;            byte[] buffer = new byte[8*1024];            while (count != filelen)            {                bytesRead = _client.Receive(buffer, buffer.Length, 0);                ms.Write(buffer, 0, bytesRead);                count += bytesRead;            }            this._msimage = ms;            ReceivedBitmap(new Bitmap(ms));        }        //接收消息        private void ReceiveMsg(long strlong)        {            byte[] buffer = new byte[1024];            string str = string.Empty;            _client.Receive(buffer);            str = Encoding.Default.GetString(buffer);            _strbuffer = Encoding.Default.GetString(buffer);            ReceivedMsg(str);        }        //发送消息        public void SendMsg(string msg)        {            byte[] arrClientMsg = Encoding.UTF8.GetBytes(msg);            byte[] len = BitConverter.GetBytes(msg.Length);            byte[] arrClientSendMsg = new byte[arrClientMsg.Length+9];            arrClientSendMsg[0] = 0;            Buffer.BlockCopy(len,0,arrClientSendMsg,1,len.Length);            Buffer.BlockCopy(arrClientMsg, 0, arrClientSendMsg, 9, arrClientMsg.Length);             try             {                _client.BeginSend(arrClientSendMsg, 0, arrClientSendMsg.Length,                                SocketFlags.None, new AsyncCallback(SendMsgCallback), null);             }             catch(SocketException ex)             {                 //可以在此处添加重新连接                 string str = ex.ToString();             }        }        //发送消息回调        private void SendMsgCallback(IAsyncResult iar)        {            _client.EndSend(iar);        }        //发送文件        public void SendFile(string filename)        {            FileInfo fi = new FileInfo(filename);            byte[] zero = {1};            byte[] len = BitConverter.GetBytes(fi.Length);            byte[] all = new byte[zero.Length+len.Length];            zero.CopyTo(all, 0);            len.CopyTo(all, zero.Length);            try            {                //首先把文件长度发送过去                _client.BeginSendFile(filename,                                all,                                null,                                TransmitFileOptions.UseDefaultWorkerThread,                                new AsyncCallback(SendFileCallback),                                null);            }            catch(SocketException ex)            {                //可以在此处添加重新连接                return;            }        }        //发送文件回调        private void SendFileCallback(IAsyncResult iar)        {            _client.EndSendFile(iar);        }        #region 属性        private MemoryStream _msimage = null;        private string _strbuffer = null;        //图片 流文件        public MemoryStream MSImage        {            get            {                return _msimage;            }        }        //字符串        public string StrBuffer        {            get            {                return _strbuffer;            }        }        #endregion    }}