在C#中實現epoll網絡編程，你需要使用第三方庫，因為.NET Core和.NET Framework沒有內置的epoll支持

1. 首先，通過NuGet安裝System.IO.Pipelines包。在Visual Studio中，右鍵單擊項目，然后選擇“管理NuGet程序包”。在“瀏覽”選項卡中搜索并安裝System.IO.Pipelines。

2. 創建一個新的C#控制臺應用程序項目。

3. 在Program.cs文件中，添加以下代碼：

using System;
using System.Net;
using System.Net.Sockets;
using System.Threading.Tasks;

namespace EpollExample
{
    class Program
    {
        static async Task Main(string[] args)
        {
            int port = 8080;
            IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, port);

            using (Socket listener = new Socket(endPoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp))
            {
                listener.Bind(endPoint);
                listener.Listen(100);

                Console.WriteLine($"Server listening on port {port}...");

                while (true)
                {
                    Socket client = await listener.AcceptAsync();
                    _ = HandleClientAsync(client);
                }
            }
        }

        private static async Task HandleClientAsync(Socket client)
        {
            try
            {
                Console.WriteLine($"New connection from {client.RemoteEndPoint}");

                // 使用System.IO.Pipelines處理客戶端連接
                // ...

                client.Shutdown(SocketShutdown.Both);
                client.Close();
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error handling client: {ex.Message}");
            }
        }
    }
}

4. 在HandleClientAsync方法中，使用System.IO.Pipelines處理客戶端連接。這里是一個簡單的示例，展示了如何使用PipeReader讀取數據：

private static async Task HandleClientAsync(Socket client)
{
    try
    {
        Console.WriteLine($"New connection from {client.RemoteEndPoint}");

        // 使用System.IO.Pipelines處理客戶端連接
        var pipe = new Pipe();
        Task writing = FillPipeAsync(client, pipe.Writer);
        Task reading = ReadPipeAsync(pipe.Reader);

        await Task.WhenAll(reading, writing);

        client.Shutdown(SocketShutdown.Both);
        client.Close();
    }
    catch (Exception ex)
    {
        Console.WriteLine($"Error handling client: {ex.Message}");
    }
}

private static async Task FillPipeAsync(Socket socket, PipeWriter writer)
{
    const int minimumBufferSize = 512;

    while (true)
    {
        Memory<byte> memory = writer.GetMemory(minimumBufferSize);
        int bytesRead = await socket.ReceiveAsync(memory, SocketFlags.None);

        if (bytesRead == 0)
        {
            break;
        }

        writer.Advance(bytesRead);

        FlushResult result = await writer.FlushAsync();

        if (result.IsCompleted)
        {
            break;
        }
    }

    writer.Complete();
}

private static async Task ReadPipeAsync(PipeReader reader)
{
    while (true)
    {
        ReadResult result = await reader.ReadAsync();
        ReadOnlySequence<byte> buffer = result.Buffer;

        if (buffer.Length > 0)
        {
            Console.WriteLine($"Received data: {Encoding.UTF8.GetString(buffer.ToArray())}");
        }

        reader.AdvanceTo(buffer.End);

        if (result.IsCompleted)
        {
            break;
        }
    }

    reader.Complete();
}

這個示例中，我們使用FillPipeAsync方法從客戶端讀取數據，并將其寫入PipeWriter。然后，ReadPipeAsync方法從PipeReader讀取數據并將其輸出到控制臺。

請注意，這只是一個簡單的示例，實際應用中可能需要更復雜的邏輯來處理客戶端連接。你可以根據需要修改HandleClientAsync方法以實現你的需求。