编辑“︁C Sharp TCP 编程”︁（章节）

== 异步TCP编程 ==
对于需要处理多个连接的服务器，应使用异步方法：

<syntaxhighlight lang="csharp">
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;

class AsyncTcpServer
{
    static async Task Main()
    {
        TcpListener server = new TcpListener(IPAddress.Any, 8888);
        server.Start();
        Console.WriteLine("异步服务器已启动");

        while (true)
        {
            TcpClient client = await server.AcceptTcpClientAsync();
            _ = HandleClientAsync(client); // 不等待以接受新连接
        }
    }

    static async Task HandleClientAsync(TcpClient client)
    {
        try
        {
            using (client)
            using (NetworkStream stream = client.GetStream())
            {
                byte[] buffer = new byte[1024];
                int bytesRead = await stream.ReadAsync(buffer, 0, buffer.Length);
                string request = Encoding.UTF8.GetString(buffer, 0, bytesRead);
                Console.WriteLine($"收到: {request}");

                string response = $"ECHO: {request}";
                byte[] responseData = Encoding.UTF8.GetBytes(response);
                await stream.WriteAsync(responseData, 0, responseData.Length);
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"客户端处理错误: {ex.Message}");
        }
    }
}
</syntaxhighlight>