Question

我会用TcpListener创建一个tcp服务器，但是我不知道什么是最好的解决方案。我尝试了3个例子。见下文。

示例1 （我使用了BeginAcceptTcpClient）

class Program
  {
    static void Main(string[] args)
    {
      var endPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 4567);
      var listener = new TcpListener(endPoint);

      listener.Start();

      AcceptTcpClient(listener);
      while (true)
      {
      }
    }

    public static void AcceptTcpClient(TcpListener listener)
    {
      listener.BeginAcceptTcpClient(ClientConnected, listener);
    }

    public static void ClientConnected(IAsyncResult asyncResult)
    {
      var listener = (TcpListener)asyncResult.AsyncState;
      var client = listener.EndAcceptTcpClient(asyncResult);
      AcceptTcpClient(listener);

      DoAsync(client);
    }
  }

示例2 （我将BeginAcceptTcpClient与AutoResetEvent一起使用）

class Program1
  {
    private static readonly AutoResetEvent CONNECTION_WAIT_HANDLE = new AutoResetEvent(false);
    static void Main(string[] args)
    {
      var endPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 4567);
      var listener = new TcpListener(endPoint);

      listener.Start();

      while (true)
      {
        listener.BeginAcceptTcpClient(ClientConnectedHandle, listener);
        CONNECTION_WAIT_HANDLE.WaitOne();
        CONNECTION_WAIT_HANDLE.Reset();
      }
    }

    public static void ClientConnectedHandle(IAsyncResult asyncResult)
    {
      var listener = (TcpListener)asyncResult.AsyncState;
      var client = listener.EndAcceptTcpClient(asyncResult);
      CONNECTION_WAIT_HANDLE.Set();

      DoAsync(client);
    }
  }

示例3 （我使用了AcceptTcpClientAsync）

class Program2
  {
    static async Task Main(string[] args)
    {
      var endPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 4567);
      var listener = new TcpListener(endPoint);

      listener.Start();

      while (true)
      {
        var client = await listener.AcceptTcpClientAsync();
        DoAsync(client);
      }
    }

    public static void AcceptTcpClient(TcpListener listener)
    {
      listener.BeginAcceptTcpClient(ClientConnected, listener);
    }

    public static void ClientConnected(IAsyncResult asyncResult)
    {
      var listener = (TcpListener)asyncResult.AsyncState;
      var client = listener.EndAcceptTcpClient(asyncResult);
      AcceptTcpClient(listener);

      DoAsync(client);
    }
  }

我认为最好的解决方案是最后一个（示例3），但我不确定。您如何看待？

Answer 1

示例3 使用基于任务的异步模式（TAP），这是docs中所述的建议用于新开发的异步设计模式。

TAP使用一种方法来表示异步操作的启动和完成。这与异步编程模型（APM或IAsyncResult）模式和基于事件的异步模式（EAP）形成对比。 APM需要Begin和End方法。 EAP需要一种具有Async后缀的方法，并且还需要一个或多个事件，事件处理程序委托类型和EventArg派生的类型。 TAP中的异步方法在操作名称之后的Async后缀中返回了等待类型的方法，例如Task，Task，ValueTask和ValueTask。

Answer 2

这是我在项目中使用的代码。它是仅接收异步服务器，但您可以根据自己的需要在Task.Run()中对其进行修改。我已注释掉代码，以便您了解其工作原理。

static async Task Main(string[] args)
{
    await RunServer();
}

static async Task RunServer()
{
    TcpListener Listener = new TcpListener(IPAddress.Any, YOURPORTHERE); // Set your listener
    Listener.Start(); // Start your listener

    while (true) // Permanent loop, it may not be the best solution
    {
        TcpClient Client = await Listener.AcceptTcpClientAsync(); // Waiting for a connection
        _ = Task.Run(() => { // Connection opened. Do operations in a new thread, meanwhile the server is ready to accept other connections in parallel
            try
            {
                var Stream = Client.GetStream(); // (read-only) get data bytes
                if (Stream.CanRead) // Verify if the stream can be read.
                {
                    byte[] Buffer = new byte[Client.ReceiveBufferSize]; // Initialize a new empty byte array with the data length.
                    StringBuilder SB = new StringBuilder();
                    do // Start converting bytes to string
                    {
                        int BytesReaded = Stream.Read(Buffer, 0, Buffer.Length);
                        SB.AppendFormat("{0}", Encoding.ASCII.GetString(Buffer, 0, BytesReaded));
                    } while (Stream.DataAvailable); // Until stream data is available

                    if (SB != null) // Stream data is ready and converted to string
                        // Do some stuffs
                }
            }
            catch (Exception Ex) // In case of errors catch it to avoid the app crash
            {
                ConsoleMessage.Error(Ex.ToString()); // Detailed exception
            }
        });
    }
}

C＃-使用TcpListener（异步）的最佳方法是什么

2 个答案: