TCP客户端断线重连-升级版

解决拔掉网线后无法快速诊断是否掉线问题

using System.Collections;
using System.Collections.Generic;
using System.Net;
using System.Net.Sockets;
using System;
using System.Text;
using System.Diagnostics;
using System.Net.NetworkInformation;
using System.Threading.Tasks;
using System.Threading;namespace MyTcpClient
{//规范命名、添加注释、合理封装、限制访问权限    public class AsyncTcpClient{private string ip1;private int port1;private byte[] ReadBytes = new byte[1024];//单例private TcpClient tcpClient;//连接服务器public void ConnectServer(string ip, int port){//防止多个事例去重复连接if (isTryingToCon == true){return;}ip1 = ip;port1 = port;try{if (tcpClient != null){tcpClient.Close();}tcpClient = new TcpClient();isTryingToCon = true;//开始异步tcpClient.BeginConnect(IPAddress.Parse(ip), port, Lianjie, null);}catch (Exception e){}}private bool isTryingToCon = false;//连接判断private void Lianjie(IAsyncResult ar){if (IsClose){return;}try{if (tcpClient.Connected == false){SetCon(0);tcpClient.Close();tcpClient = new System.Net.Sockets.TcpClient();//尝试重连。。。。。。;tcpClient.BeginConnect(IPAddress.Parse(ip1), port1, Lianjie, null);}else{tcpClient.Client.IOControl(IOControlCode.KeepAliveValues, KeepAlive(1, 500, 500), null);//连接上了isTryingToCon = false;//结束异步连接tcpClient.EndConnect(ar);//读取数据tcpClient.GetStream().BeginRead(ReadBytes, 0, ReadBytes.Length, ReceiveCallBack, null);SetCon(1);}}catch (Exception){}}private byte[] KeepAlive(int onOff, int keepAliveTime, int keepAliveInterval){byte[] buffer = new byte[12];BitConverter.GetBytes(onOff).CopyTo(buffer, 0);BitConverter.GetBytes(keepAliveTime).CopyTo(buffer, 4);BitConverter.GetBytes(keepAliveInterval).CopyTo(buffer, 8);return buffer;}//接收消息private void ReceiveCallBack(IAsyncResult ar){try{int len = tcpClient.GetStream().EndRead(ar);//结束异步读取if (len > 0){MyEventArgs e = new MyEventArgs(ip1, ReadBytes);_MsgChange(e);//重置数据,防止旧数据残留ReadBytes = new byte[512];tcpClient.GetStream().BeginRead(ReadBytes, 0, ReadBytes.Length, ReceiveCallBack, null);}else{//尝试重连。。。。。。"ConnectServer(ip1, port1);}}catch (Exception e){}}//发送消息public bool SendMsg(string msg){//发送XXXX0001_000000000000_   (没有下划线)             //接收00570002_000000000000_010001020103try{//数据部分byte[] bt_Data = Encoding.ASCII.GetBytes(msg);byte[] bt_head = Encoding.ASCII.GetBytes((bt_Data.Length + 4).ToString("0000"));byte[] bt_send = new byte[bt_Data.Length + 4];for (int i = 0; i < bt_head.Length; i++){bt_send[i] = bt_head[i];}for (int i = 0; i < bt_Data.Length; i++){bt_send[i + 4] = bt_Data[i];}//开始异步发送try{tcpClient.GetStream().BeginWrite(bt_send, 0, bt_send.Length, (ar) =>{tcpClient.GetStream().EndWrite(ar);//结束异步发送}, null);}catch (Exception ex){string abc = ex.ToString();}return true;}catch (Exception ex){SetCon(-1);SetCon(0);// int a = ex.NativeErrorCode;//尝试重连。。。。。。"ConnectServer(ip1, port1);return false;}}public bool SendMsg(byte[] msg){try{//开始异步发送tcpClient.GetStream().BeginWrite(msg, 0, msg.Length, (ar) =>{tcpClient.GetStream().EndWrite(ar);//结束异步发送}, null);return true;}catch (Exception ex){//尝试重连。。。。。。"SetCon(-1);SetCon(0);ConnectServer(ip1, port1);return false;}}bool IsClose = false;/// <summary>/// 断开连接/// </summary>public void Close(){IsClose = true;if (tcpClient != null && (tcpClient.Client == null || tcpClient.Client.Connected)){tcpClient.Close();}}public int isConnected = -1;/// <summary>/// -1 初始化  0 未连接  1 连接/// </summary>/// <param name="_con"></param>private void SetCon(int _con){if (isConnected != _con){bool rel = false;if (_con == 1){rel = true;}isConnected = _con;MyEventArgs e = new MyEventArgs(ip1 + "__" + port1.ToString(), rel);_ConChange(e);}}public void StarPing(){Task.Factory.StartNew(() => PingOC());}private void PingOC(){Ping ping = new Ping();while (!IsClose){try{PingReply pingReply = ping.Send(ip1, 1000);//网络状态if (pingReply.Status != IPStatus.Success){SetCon(-1);SetCon(0);ConnectServer(ip1, port1);}Thread.Sleep(1000);}catch (Exception){}}}public class MyEventArgs : EventArgs{public string IP;public bool IsConnetct;public byte[] Msg;public MyEventArgs(string iP, byte[] msg){IP = iP;Msg = msg;}public MyEventArgs(string iP, bool iscon){IP = iP;IsConnetct = iscon;}}//连接状态public delegate void ConChange(object sender, MyEventArgs args);public event ConChange OnConChange;protected virtual void _ConChange(MyEventArgs e){if (OnConChange != null){OnConChange(this, e);}}//收到的消息public delegate void MsgChange(object sender, MyEventArgs args);public event MsgChange OnMsgChange;protected virtual void _MsgChange(MyEventArgs e){if (OnMsgChange != null){OnMsgChange(this, e);}}}
}

调用方法:

 AsyncTcpClient sw = new AsyncTcpClient();           sw.ConnectServer("192.168.1.1", 4545);sw.OnConChange += Sw_OnConChange;sw.OnMsgChange += Sw_OnMsgChange;sw.StarPing();private void Sw_OnConChange(object sender, AsyncTcpClient.MyEventArgs args){if (args.IsConnetct){//已连接}else{//已断开}
}private void Sw_OnMsgChange(object sender, AsyncTcpClient.MyEventArgs args){//接收的信息string str = Encoding.ASCII.GetString(args.Msg, 0, args.Msg.Length);str = Uri.UnescapeDataString(str).Replace("\0", "");}public void CloseTcp(){sw.OnConChange -= Sw_OnConChange;sw.OnMsgChange -= Sw_OnMsgChange;sw.Close();}

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