如何在C#中使用DotNetty实现TCP

在C#中可以使用DotNetty来实现TCP通信，以下是一个简单的示例代码：

using DotNetty.Buffers;
    
using DotNetty.Codecs;
    
using DotNetty.Common.Concurrency;
    
using DotNetty.Transport.Bootstrapping;
    
using DotNetty.Transport.Channels;
    
using DotNetty.Transport.Channels.Sockets;
    
using System;
    
using System.Net;
    
using System.Text;
    
using System.Threading.Tasks;


class Program
{

    static async Task Main(string[] args)
    {
    
        var group = new MultithreadEventLoopGroup();
    

        var bootstrap = new ServerBootstrap();
    
        bootstrap
            .Group(group)
            .Channel<
    TcpServerSocketChannel>
    ()
            .Option(ChannelOption.SoBacklog, 100)
            .Handler(new LoggingHandler(LogLevel.INFO))
            .ChildHandler(new ActionChannelInitializer<
    ISocketChannel>
    (channel =>

            {
    
                IChannelPipeline pipeline = channel.Pipeline;
    

                pipeline.AddLast(new LengthFieldBasedFrameDecoder(ByteOrder.BigEndian, int.MaxValue, 0, 4, 0, 4, true));
    
                pipeline.AddLast(new LengthFieldPrepender(ByteOrder.BigEndian, 4, 0, false));
    
                pipeline.AddLast(new StringEncoder(Encoding.UTF8));
    
                pipeline.AddLast(new StringDecoder(Encoding.UTF8));
    
                pipeline.AddLast(new SimpleServerHandler());

            }
    ));
    

        IChannel boundChannel = await bootstrap.BindAsync(IPAddress.Parse("127.0.0.1"), 8888);
    
        Console.ReadLine();
    

        await boundChannel.CloseAsync();
    
        await group.ShutdownGracefullyAsync(TimeSpan.FromMilliseconds(100), TimeSpan.FromSeconds(1));

    }

}
    

public class SimpleServerHandler : SimpleChannelInboundHandler<
    string>

{

    protected override void ChannelRead0(IChannelHandlerContext ctx, string msg)
    {

        Console.WriteLine($"Received from client: {
msg}
    ");
    

        // Echo back to client
        ctx.WriteAndFlushAsync(msg);

    }


    public override void ExceptionCaught(IChannelHandlerContext ctx, Exception cause)
    {

        Console.WriteLine($"Exception: {
cause}
    ");
    
        ctx.CloseAsync();

    }

}
    

以上代码是一个简单的TCP服务器示例，它监听本地IP地址127.0.0.1的8888端口，并使用DotNetty来处理TCP通信。在SimpleServerHandler类中，实现了处理接收到的消息和异常的方法。可以根据实际需求修改代码来实现自定义的TCP通信逻辑。

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