使用Kestrel创建tcp服务器

要使用Kestrel创建TCP服务器，您需要使用`Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets` NuGet包。以下是一个示例，演示如何使用Kestrel创建TCP服务器：

using System;
using System.Net;
using System.Net.Sockets;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets;

class Program
{
    static async Task Main(string[] args)
    {
        var host = new WebHostBuilder()
            .UseKestrel(options =>
            {
                options.Listen(IPAddress.Any, 1234, listenOptions =>
                {
                    listenOptions.UseConnectionHandler<TcpConnectionHandler>();
                });
            })
            .ConfigureServices(services => services.AddSingleton<TcpConnectionHandler>())
            .Configure(app => app.UseRouting())
            .Build();

        await host.RunAsync();
    }
}

class TcpConnectionHandler : ConnectionHandler
{
    public override async Task OnConnectedAsync(ConnectionContext connection)
    {
        Console.WriteLine($"New client connected: {connection.ConnectionId}");

        while (true)
        {
            var buffer = new byte[1024];
            var result = await connection.Transport.Input.ReadAsync(buffer);
            var input = Encoding.UTF8.GetString(buffer.Slice(0, result.Buffer.Length));
            Console.WriteLine($"Received from client {connection.ConnectionId}: {input}");

            if (result.IsCompleted)
            {
                break;
            }
        }
    }
}

在此示例中，`Listen`方法用于配置Kestrel服务器以侦听TCP连接。使用`UseConnectionHandler`方法指定连接处理程序，该处理程序将处理所有传入的连接。在此示例中，我们使用`TcpConnectionHandler`类作为连接处理程序。在`TcpConnectionHandler`的`OnConnectedAsync`方法中，我们读取来自客户端的数据并打印到控制台上。