使用msdn上的异步接收数据的例子，发现漏接数据

使用TCP &UDP测试工具，创建一个服务器
每100ms发送一次1234567890
使用msdn上的异步接收数据的例子，作为客户端来接收数据
通过输出日志发现，并不是每一秒都能接收到10次数据
以下为代码：using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.IO;namespace AsynSocket
{
    // State object for receiving data from remote device.
    public class StateObject
    {
        // Client socket.
        public Socket workSocket = null;
        // Size of receive buffer.
        public const int BufferSize = 256;
        // Receive buffer.
        public byte[] buffer = new byte[BufferSize];
        // Received data string.
        public StringBuilder sb = new StringBuilder();
    }    public class AsynchronousClient
    {
        // The port number for the remote device.
        private const int port = 6000;        // ManualResetEvent instances signal completion.
        private static ManualResetEvent connectDone =
            new ManualResetEvent(false);
        private static ManualResetEvent sendDone =
            new ManualResetEvent(false);
        private static ManualResetEvent receiveDone =
            new ManualResetEvent(false);        // The response from the remote device.
        private static String response = String.Empty;        private static void StartClient()
        {
            // Connect to a remote device.
            try
            {
                // Establish the remote endpoint for the socket.
                // The name of the 
                // remote device is "host.contoso.com".
                IPHostEntry ipHostInfo = Dns.Resolve("127.0.0.1");
                IPAddress ipAddress = ipHostInfo.AddressList[0];
                IPEndPoint remoteEP = new IPEndPoint(ipAddress, port);                // Create a TCP/IP socket.
                Socket client = new Socket(AddressFamily.InterNetwork,
                    SocketType.Stream, ProtocolType.Tcp);                // Connect to the remote endpoint.
                client.BeginConnect(remoteEP,
                    new AsyncCallback(ConnectCallback), client);
                connectDone.WaitOne();                // Send test data to the remote device.
                Send(client, "This is a test<EOF>");
                sendDone.WaitOne();                // Receive the response from the remote device.
                Receive(client);
                receiveDone.WaitOne();                // Write the response to the console.
                Console.WriteLine("Response received : {0}", response);                // Release the socket.
                client.Shutdown(SocketShutdown.Both);
                client.Close();            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }
        }        private static void ConnectCallback(IAsyncResult ar)
        {
            try
            {
                // Retrieve the socket from the state object.
                Socket client = (Socket)ar.AsyncState;                // Complete the connection.
                client.EndConnect(ar);                Console.WriteLine("Socket connected to {0}",
                    client.RemoteEndPoint.ToString());                // Signal that the connection has been made.
                connectDone.Set();
            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }
        }        private static void Receive(Socket client)
        {
            try
            {
                // Create the state object.
                StateObject state = new StateObject();
                state.workSocket = client;                // Begin receiving the data from the remote device.
                client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
                    new AsyncCallback(ReceiveCallback), state);
            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }
        }        private static void ReceiveCallback(IAsyncResult ar)
        {
            try
            {                // Retrieve the state object and the client socket 
                // from the asynchronous state object.
                StateObject state = (StateObject)ar.AsyncState;
                Socket client = state.workSocket;                // Read data from the remote device.
                int bytesRead = client.EndReceive(ar);
                //检验正文长度
                //检验包头OXIFF
                //获得包体长度
                //根据包体长度和接收数据的长度来判断是否粘包
                //验证通过后放进队列中
                if (bytesRead > 0)
                {
                    state.sb.Length = 0;
                    //state.sb = null;
                    // There might be more data, so store the data received so far.
                    state.sb.Append("从服务器接收的数据为：");
                    state.sb.Append(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));
                    state.sb.Append("==");
                    state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));                    //Console.WriteLine("从服务器接收的数据为：" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:mmm") + ":" + state.sb.ToString());
                    WriteFile(state.sb.ToString());
                    //当接收的字节数大于0的时候，再次调用回调函数来接收数据
                    client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
                        new AsyncCallback(ReceiveCallback), state);
                }
                else
                {
                    // All the data has arrived; put it in response.
                    if (state.sb.Length > 1)
                    {
                        response = state.sb.ToString();
                    }
                    // Signal that all bytes have been received.
                    receiveDone.Set();
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }
        }        private static void Send(Socket client, String data)
        {
            // Convert the string data to byte data using ASCII encoding.
            byte[] byteData = Encoding.ASCII.GetBytes(data);            // Begin sending the data to the remote device.
            client.BeginSend(byteData, 0, byteData.Length, 0,
                new AsyncCallback(SendCallback), client);
        }        private static void SendCallback(IAsyncResult ar)
        {
            try
            {
                // Retrieve the socket from the state object.
                Socket client = (Socket)ar.AsyncState;                // Complete sending the data to the remote device.
                int bytesSent = client.EndSend(ar);
                Console.WriteLine("Sent {0} bytes to server.", bytesSent);                // Signal that all bytes have been sent.
                sendDone.Set();
            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }
        }        public static int Main(String[] args)
        {
            StartClient();
            return 0;
        }        #region 写日志，日志的生成方式为按照固定大小生成
        /// <summary>
        /// 写日志文件
        /// </summary>
        /// <param name="data">日志文件内容</param>
        public static void WriteFile(string data)
        {            //创建一个AlgorithmLog文件夹来存储日志
            string releaseLogPath = @"D:\vs2008Workspace\CSharp基础练习\AsynSocket\bin\Debug\Test\";            if (!Directory.Exists(releaseLogPath))
            {
                Directory.CreateDirectory(releaseLogPath);
            }            string strCurrentTime = DateTime.Now.Year.ToString("0000") + "-" + DateTime.Now.Month.ToString("00") + "-" + DateTime.Now.Day.ToString("00");
            strCurrentTime += " " + DateTime.Now.Hour.ToString("00") + ":" + DateTime.Now.Minute.ToString("00") + ":" + DateTime.Now.Second.ToString("00") + " ";            try
            {
                string releaseLogName = releaseLogPath + DateTime.Now.ToString("yyyy-MM-dd") + ".txt";
                if (!File.Exists(releaseLogName))
                {
                    FileStream fs = File.Create(releaseLogName);
                    fs.Close();
                }                FileInfo fi = new FileInfo(releaseLogName);
                if (fi.Length > 1024 * 1024 * 50) //50M
                {
                    File.Move(releaseLogName, releaseLogPath + DateTime.Now.ToString("yyyyMMddHHmmss") + ".txt");
                    if (!File.Exists(releaseLogName)) { using (File.Create(releaseLogName)) { } }
                }
                FileStream fsWrite = new FileStream(releaseLogName, FileMode.Append, FileAccess.Write, FileShare.ReadWrite);
                StreamWriter sr = new StreamWriter(fsWrite, System.Text.Encoding.Default);
                sr.WriteLine(strCurrentTime + data);                sr.Dispose();
                sr.Close();
                fsWrite.Dispose();
                fsWrite.Close();
            }
            catch (Exception ex)
            {
                WriteFile("WriteFile方法异常：" + ex.ToString());
                return;
            }
        }
        #endregion    }
}