using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;

namespace SocketDemo
{
    static class Program
    {
        static void Main(string[] argv)
        {
            Socket sktltn = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            sktltn.Bind(new IPEndPoint(IPAddress.Any, 12345));
            sktltn.Listen(30);
            while (true)
            {
                Socket sk = sktltn.Accept();
                ThreadPool.QueueUserWorkItem(p =>
                {
                    Socket skc = (Socket)sk;
                    byte[] array = new byte[10240];
                    int offset = 0;
                    while (true)
                    {
                        int len = skc.Receive(array, offset, array.Length - offset, SocketFlags.None);
                        if (len == 0)
                        {
                            break;
                        }
                        offset += len;
                    }
                    string content = Encoding.UTF8.GetString(array, 0, offset);
                    Console.WriteLine("> " + content);
                }, sk);
            }
        }
    }
}

------解决方案--------------------
把这段另起一个线程就不会阻塞ui线程了
C# code

new Thread(new ThreadStart(delegate{
Socket sktltn = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            sktltn.Bind(new IPEndPoint(IPAddress.Any, 12345));
            sktltn.Listen(30);
            while (true)
            {
                Socket sk = sktltn.Accept();
                ThreadPool.QueueUserWorkItem(p =>
                {
                    Socket skc = (Socket)sk;
                    byte[] array = new byte[10240];
                    int offset = 0;
                    while (true)
                    {
                        int len = skc.Receive(array, offset, array.Length - offset, SocketFlags.None);
                        if (len == 0)
                        {
                            break;
                        }
                        offset += len;
                    }
                    string content = Encoding.UTF8.GetString(array, 0, offset);
                    Console.WriteLine("> " + content);
                }, sk);
            }

})).Start();