.NET開發非同步SOCKET （IOCP）

在網上很多人討論.NET非同步SOCKET通訊的問題。

很多人都有誤解，都以為非要用系統底層的IOCP，實際上沒那麼麻煩，要相信.NET封裝了所有系統底層操作。

實際上.NET的IOCP微軟早有例子，下面是該例子：

class Server
{
    private int m_numConnections;   // the maximum number of connections the sample is designed to handle simultaneously
    private int m_receiveBufferSize;// buffer size to use for each socket I/O operation
    BufferManager m_bufferManager;  // represents a large reusable set of buffers for all socket operations
    const int opsToPreAlloc = 2;    // read, write (don't alloc buffer space for accepts)
    Socket listenSocket;            // the socket used to listen for incoming connection requests
    // pool of reusable SocketAsyncEventArgs objects for write, read and accept socket operations
    SocketAsyncEventArgsPool m_readWritePool;
    int m_totalBytesRead;           // counter of the total # bytes received by the server
    int m_numConnectedSockets;      // the total number of clients connected to the server
    Semaphore m_maxNumberAcceptedClients;
   ...略（參考MSDN，百度查詢關鍵字SocketAsyncEventArgs可查到此例子）
}
也就是微軟為SOCKET定義的那些BeginXXX（.NET2.0)或ReceiveAsync（.NET3.5)等等那些方法。

這是.NET完成連接埠的實現。

筆者開發了基於此的TCP伺服器，可以支援10萬人同時線上。