C#使用SocketAsyncEventArgs实现Socket客户端通信

最新推荐文章于 2025-05-02 14:36:20 发布

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最新推荐文章于 2025-05-02 14:36:20 发布

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分类专栏： socket 文章标签： socket c# 网络通信

本文链接：https://blog.youkuaiyun.com/q1143910315/article/details/106065788

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本文介绍如何使用C#的SocketAsyncEventArgs实现高性能的TCP套接字客户端，强调异步连接和线程安全的SendPackage方法。详细讨论了连接、发送数据和接收数据的机制，并提供了处理回调事件的建议，以避免丢包和性能问题。

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用System.Net.Sockets.Socket类实现tcp通信并不简单，需要大量代码去实现，但其接近底层而可以发挥更高的效率，本文的目标是实现高性能的套接字客户端，否则没有使用Socket的必要，而应该使用更为简单易用的System.Net.Sockets.TcpClient

首先是参考资料，第一当然是微软的文档（https://docs.microsoft.com/zh-cn/dotnet/api/system.net.sockets.socket?view=netcore-3.1），其次是其他人写的代码https://www.iteye.com/blog/freshflower-2285286（C#SocketAsyncEventArgs实现高效能多并发TCPSocket通信 (客户端实现），有没有觉得本文的标题很像这篇文章？其实不然，本文采用与该作者不同的思路去写，实际代码完全不同，有雷同部分只是必须这么写而已。

using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Sockets;
using System.Text;

namespace CommonCode.CCnetwork {
    public class CCSocketClient {
        public delegate void OnConnectedEvent(bool connected);
        public delegate void OnReceivePackageEvent(int signal, byte[] buffer);
        public delegate void OnConnectionBreakEvent();
        public delegate void OnSocketExceptionEvent(SocketException socketException);
        public OnConnectedEvent onConnectedEvent;
        public OnReceivePackageEvent onReceivePackageEvent;
        public OnConnectionBreakEvent onConnectionBreakEvent;
        public OnSocketExceptionEvent onSocketExceptionEvent;
        private Socket socket;
        private readonly SocketAsyncEventArgs receiveEventArgs;
        private readonly SocketAsyncEventArgs[] sendEventArgs = new SocketAsyncEventArgs[] { new SocketAsyncEventArgs(), new SocketAsyncEventArgs() };
        private readonly byte[] recvBuffer = new byte[255];
        private readonly byte[] sendBuffer = new byte[255];
        private readonly List<byte> recvData = new List<byte>();
        private readonly List<byte> sendData = new List<byte>();
        private byte state = 0;
        public CCSocketClient() {
            if (!Socket.OSSupportsIPv4) {
                throw new NotSupportedException("系统不支持IPv4网络！");
            }
            receiveEventArgs = new SocketAsyncEventArgs();
            receiveEventArgs.SetBuffer(recvBuffer, 0, recvBuffer.Length);
            receiveEventArgs.Completed += ReceiveEventArgs_Completed;
            sendEventArgs[0].Completed += SendEventArgs_Completed; ;
            sendEventArgs[1].Completed += SendEventArgs_Completed; ;
        }
        public void Connect(string host, int port) {
            try {
                IPHostEntry entry = Dns.GetHostEntry(host);
                if (entry != null && entry.AddressList != null) {
                    for (int AddressListIndex = 0; AddressListIndex < entry.AddressList.Length; AddressListIndex++) {
                        if (entry.AddressList[AddressListIndex].AddressFamily == AddressFamily.InterNetwork) {
                            socket?.Close();
                            socket?.Dispose();
                            socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                            Soc