我会这样做,因为我希望我的代码适用于HTTP和HTTPS.如果请求来自HTTPS,我将继续使用经过身份验证的SslStream而不是原始套接字.

这是我的代码：

using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Text;

namespace LearnRequestType
{
    class StackOverFlow
    {
        private static readonly ManualResetEvent _manualResetEvent = new ManualResetEvent(false);

        private void StartListening()
        {
            IPEndPoint localEndPoint = new IPEndPoint(IPAddress.Any,9002);

            if (localEndPoint != null)
            {
                Socket listener = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);

                if (listener != null)
                {
                    listener.Bind(localEndPoint);
                    listener.Listen(10);

                    Console.WriteLine("Socket listener is running...");

                    listener.BeginAccept(new AsyncCallback(AcceptCallback),listener);
                }
            }
        }

        private void AcceptCallback(IAsyncResult ar)
        {
            _manualResetEvent.Set();

            Socket listener = (Socket)ar.AsyncState;

            Socket handler = listener.EndAccept(ar);

            StateObject state = new StateObject();
            state.workSocket = handler;

            // I want to understand if request comes from HTTP or HTTPS before this line.
            handler.BeginReceive(state.buffer,StateObject.BufferSize,new AsyncCallback(ReceiveCallback),state);

            listener.BeginAccept(new AsyncCallback(AcceptCallback),listener);
        }

        private void ReceiveCallback(IAsyncResult result)
        {
            StateObject state = (StateObject)result.AsyncState;
            Socket handler = state.workSocket;

            string clientIP = ((IPEndPoint)handler.RemoteEndPoint).Address.ToString();

            int numBytesReceived = handler.EndReceive(result);

            if (!handler.Connected)
            {
                handler.Close();
                return;
            }

            // Read incoming data...
            if (numBytesReceived > 0)
            {
                state.sb.Append(Encoding.ASCII.GetString(state.buffer,numBytesReceived));

                // Read incoming data line by line.
                string[] lines = state.sb.ToString().Split('\n');

                if (lines[lines.Length - 1] == "<EOF>")
                {
                    // We received all data. Do something...

                }
                else
                {
                    // We didn't receive all data. Continue reading...
                    handler.BeginReceive(state.buffer,state.buffer.Length,SocketFlags.None,state);
                }
            }
        }
    }
}

public class StateObject
{
    public Socket workSocket = null;
    public const int BufferSize = 256;
    public byte[] buffer = new byte[BufferSize];
    public StringBuilder sb = new StringBuilder();
}

如果我更改AcceptCallBack方法和StateObject类：

private void AcceptCallback(IAsyncResult ar)
{
    _manualResetEvent.Set();

    Socket listener = (Socket)ar.AsyncState;

    Socket handler = listener.EndAccept(ar);

    try
    {
        sslStream = new SslStream(new NetworkStream(handler,true));

        // try to authenticate
        sslStream.AuthenticateAsServer(_cert,false,System.Security.Authentication.SslProtocols.Tls,true);

        state.workStream = sslStream;
        state.workStream.ReadTimeout = 100000;
        state.workStream.WriteTimeout = 100000;

        if (state.workStream.IsAuthenticated)
        {
            state.workStream.BeginRead(state.buffer,ReceiveCallback,state);
        }
    }
    catch (IOException ex)
    {
        // ıf we get handshake Failed due to an unexpected packet format,this means incoming data is not HTTPS
        // Continue with socket not sslstream
        state.workSocket = handler;
        handler.BeginReceive(state.buffer,state);
    }

    StateObject state = new StateObject();
    state.workStream = handler;

    handler.BeginReceive(state.buffer,state);

    listener.BeginAccept(new AsyncCallback(AcceptCallback),listener);
}

public class StateObject
{
    public Socket workSocket = null;
    public SslStream workStream = null;
    public const int BufferSize = 1024;
    public byte[] buffer = new byte[BufferSize];
    public StringBuilder sb = new StringBuilder();
}

我可以决定传入的数据类型是HTTP还是HTTPS,但如果是HTTP,它每次都会被catch块处理,因此会降低应用程序性能.

还有另一种方式吗？