C#Socket 網絡通信異步處理 SocketAsyncEventArgs 異步套接字操作

1.服務端簡單實現：

    public partial class Form_Server : Form
    {
        private Socket socket;

        public Form_Server()
        {
            InitializeComponent();
        }

        private void Form_Server_Load(object sender, EventArgs e)
        {
            
 
try
            {
                //獲取本地ip地址
                IPAddress ipaddress = Dns.GetHostByName(Dns.GetHostName()).AddressList[0];
                txt_ip.Text = ipaddress.ToString();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        
 
//開啟Socket監聽
        private void btn_listent_open_Click(object sender, EventArgs e)
        {
            try
            {
                if (string.IsNullOrEmpty(txt_ip.Text))
                {
                    MessageBox.Show("請輸入IP地址");
                }

                //打開監聽
                IPAddress ip = IPAddress.Parse(txt_ip.Text);
                IPEndPoint localEP 
 
= new IPEndPoint(ip, Int32.Parse(txt_port.Text));
                socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                socket.Bind(localEP);
                socket.Listen(1000);

                //AcceptAsync異步方式
                SocketAsyncEventArgs socketAsyncEventArgs = new SocketAsyncEventArgs();
                socketAsyncEventArgs.Completed += new EventHandler<SocketAsyncEventArgs>(socketAsyncEventArgs_Completed_AcceptAsync);
                socketAsyncEventArgs.RemoteEndPoint = localEP;
                socketAsyncEventArgs.UserToken = socket;
                socket.AcceptAsync(socketAsyncEventArgs);
               
                //消息提示
                this.lb_msg.Items.Add("[服務端]:");
                this.lb_msg.Items.Add("         監聽成功");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        //開始一個異步操作來接受一個傳入的連接嘗試
        void socketAsyncEventArgs_Completed_AcceptAsync(object ServerSocket, SocketAsyncEventArgs e)
        {
            //已關閉，重疊的操作被中止
            if (e.SocketError == SocketError.OperationAborted)
            {
                //已關閉，重疊的操作被中止
                this.lb_msg.Invoke(new Action(() =>
                {
                    this.lb_msg.Items.Add("[服戶端]:");
                    this.lb_msg.Items.Add("         socketAsyncEventArgs_Completed_AcceptAsync：已關閉，重疊的操作被中止>SocketError：OperationAborted");
                }));
                return;
            }

            //此連接由遠程對等計算機重置
            if (e.SocketError == SocketError.ConnectionReset && e.BytesTransferred == 0)
            {
                //此連接由遠程對等計算機重置
                this.lb_msg.Invoke(new Action(() =>
                {
                    this.lb_msg.Items.Add("[服戶端]:");
                    this.lb_msg.Items.Add("         socketAsyncEventArgs_Completed_AcceptAsync：此連接由遠程對等計算機重置>SocketError：ConnectionReset");
                }));
                return;
            }
            
            if (e.LastOperation == SocketAsyncOperation.Accept)
            {
                try
                {
                    Socket acceptSocket = e.AcceptSocket;
                     
                    //開始一個異步請求以便從連接的 System.Net.Sockets.Socket 對象中接收數據
                    SocketAsyncEventArgs socketAsyncEventArgsReceiveAsync = new SocketAsyncEventArgs();
                    socketAsyncEventArgsReceiveAsync.UserToken = acceptSocket;
                    byte[] receiveBuff = new byte[1024 * 4];
                    socketAsyncEventArgsReceiveAsync.SetBuffer(receiveBuff, 0, receiveBuff.Length);
                    socketAsyncEventArgsReceiveAsync.Completed += new EventHandler<SocketAsyncEventArgs>(socketAsyncEventArgs_Completed_ReceiveAsync);
                    acceptSocket.ReceiveAsync(socketAsyncEventArgsReceiveAsync);

                    //消息提示
                    this.lb_msg.Invoke(new Action(() =>
                    {
                        this.lb_msg.Items.Add("[客戶端]:");
                        this.lb_msg.Items.Add("         連接成功");
                    }));
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
                //開始一個異步操作來接受一個傳入的連接嘗試，遞歸
                e.AcceptSocket = null;
                socket.AcceptAsync(e);
            }
        }

        //開始一個異步請求以便從連接的 System.Net.Sockets.Socket 對象中接收數據
        void socketAsyncEventArgs_Completed_ReceiveAsync(object acceptSocket, SocketAsyncEventArgs e)
        {
            //已關閉，重疊的操作被中止
            if (e.SocketError == SocketError.OperationAborted)
            {
                //已關閉，重疊的操作被中止 
                this.lb_msg.Invoke(new Action(() =>
                {
                    this.lb_msg.Items.Add("[服戶端]:");
                    this.lb_msg.Items.Add("         socketAsyncEventArgs_Completed_ReceiveAsync：已關閉，重疊的操作被中止>SocketError：OperationAborted");
                }));
                return;
            }

            //此連接由遠程對等計算機重置
            if (e.SocketError == SocketError.ConnectionReset && e.BytesTransferred == 0)
            {
                //此連接由遠程對等計算機重置
                this.lb_msg.Invoke(new Action(() => {
                    this.lb_msg.Items.Add("[服戶端]:");
                    this.lb_msg.Items.Add("         socketAsyncEventArgs_Completed_ReceiveAsync：此連接由遠程對等計算機重置>SocketError：ConnectionReset");
                }));
                return;
            }
            
            if (e.SocketError == SocketError.Success && e.Buffer.Length > 0)
            {
                try
                {
                    Socket socket = acceptSocket as Socket;

                    string ipAddress = socket.RemoteEndPoint.ToString();
                    int lengthuffer = e.BytesTransferred;

                    byte[] receiveBuffer = e.Buffer;
                    byte[] buffer = new byte[lengthuffer];
                    Buffer.BlockCopy(receiveBuffer, 0, buffer, 0, lengthuffer);
                    string message = Encoding.UTF8.GetString(buffer);

                    this.lb_msg.Invoke(new Action(() =>
                    {
                        this.lb_msg.Items.Add("[客戶端]:");
                        this.lb_msg.Items.Add("         " + message);
                    }));

                    socket.Send(Encoding.UTF8.GetBytes(string.Format("收到消息{0}：{1}", DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss"), message)));
                    socket.ReceiveAsync(e);
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
        }

        //關閉Socket監聽
        private void btn_listent_Close_Click(object sender, EventArgs e)
        {
            try
            {
                if (socket != null)
                {
                    socket.Close();
                }
                this.lb_msg.Items.Add("[服務端]:");
                this.lb_msg.Items.Add("         關閉監聽成功");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
           
        }
    }

2.客戶端簡單實現：

    public partial class ClientMainForm : Form
    {
        private Socket _socket;
        public ClientMainForm()
        {
            InitializeComponent();
        }

        //登錄
        private void btn_login_Click(object sender, EventArgs e)
        {
            try
            {
                IPAddress ip = IPAddress.Parse(this.txt_ip.Text);
                IPEndPoint ipendPoint = new IPEndPoint(ip, Int32.Parse(this.txt_port.Text));

                _socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                _socket.Connect(ipendPoint);

                this.lb_msg.Items.Add("[客戶端]:");
                this.lb_msg.Items.Add("         連接服務端成功");

                //開啟新的接受消息異步操作事件
                SocketAsyncEventArgs socketAsyncEventArgs = new SocketAsyncEventArgs();
                //設置消息的緩沖區大小
                byte[] receiveBuff = new byte[1024 * 4];
                socketAsyncEventArgs.SetBuffer(receiveBuff, 0, receiveBuff.Length);
                socketAsyncEventArgs.UserToken = _socket;
                //綁定回調事件
                socketAsyncEventArgs.Completed += socketAsyncEventArgs_Completed_ReceiveAsync;
                _socket.ReceiveAsync(socketAsyncEventArgs);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        //開始一個異步請求以便從連接的 System.Net.Sockets.Socket 對象中接收數據。
        void socketAsyncEventArgs_Completed_ReceiveAsync(object sender, SocketAsyncEventArgs e)
        {
            //已關閉，重疊的操作被中止
            if (e.SocketError == SocketError.OperationAborted)
            {
                this.lb_msg.Invoke(new Action(() =>
                {
                    this.lb_msg.Items.Add("[客戶端]:");
                    this.lb_msg.Items.Add("         socketAsyncEventArgs_Completed_ReceiveAsync：已關閉，重疊的操作被中止：OperationAborted");
                }));
                return;
            }

            //此連接由遠程對等計算機重置
            if (e.SocketError == SocketError.ConnectionReset && e.BytesTransferred == 0)
            {
                //此連接由遠程對等計算機重置
                this.lb_msg.Invoke(new Action(() =>
                {
                    this.lb_msg.Items.Add("[客戶端]:");
                    this.lb_msg.Items.Add("         socketAsyncEventArgs_Completed_ReceiveAsync：此連接由遠程對等計算機重置：ConnectionReset");
                }));
                return; 
            }

            Socket socket = sender as Socket;
            if(e.SocketError==SocketError.Success&&e.Buffer.Length>0)
            {
                string ipAddress = socket.RemoteEndPoint.ToString();
                int lengthuffer = e.BytesTransferred;

                byte[] receiveBuffer = e.Buffer;
                byte[] buffer = new byte[lengthuffer];
                Buffer.BlockCopy(receiveBuffer, 0, buffer, 0, lengthuffer);
                string message = Encoding.UTF8.GetString(buffer);


                this.lb_msg.Invoke(new Action(() =>
                {
                    this.lb_msg.Items.Add("[服務戶端]:");
                    this.lb_msg.Items.Add("         " + message);
                }));
              
                socket.ReceiveAsync(e);
            }
        }

        //發送消息
        private void btn_sendmsg_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrEmpty(txt_msg.Text))
            {
                MessageBox.Show("請輸入消息");
            }
            else
            {
                _socket.Send(System.Text.Encoding.UTF8.GetBytes(txt_msg.Text));
            }
        }
    }

C#Socket 網絡通信異步處理 SocketAsyncEventArgs