/// <summary>
/// 开始接收
/// </summary>
/// <param name="stream">Socket网络流</param>
/// <param name="callback">回调函数</param>
/// <param name="state">自定义状态</param>
/// <returns>异步结果</returns>
public IAsyncResult BeginReceive(Stream stream, AsyncCallback callback, object state)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
if (!stream.CanRead)
{
throw new ArgumentException("stream can not read");
}
if (callback == null)
{
throw new ArgumentNullException("callback");
}
SocketAsyncResult result = new SocketAsyncResult(state);
SocketHandlerState shs = new SocketHandlerState(); //初始化SocketHandlerState
shs.Data = new byte[1024];
shs.Stream = stream;
shs.Completed = true;
shs.AsyncResult = result;
shs.AsyncCallBack = callback;
//开始异步接收数据，包含接收的数据长度
try
{
stream.BeginRead(shs.Data, 0, 1024, EndRead, shs);
}
catch
{
result.CompletedSynchronously = true;
shs.Data = new byte[0];
shs.DataLength = 0;
shs.Completed = false;
lock (StateSet)
StateSet.Add(result, shs);
((AutoResetEvent)result.AsyncWaitHandle).WaitOne();
callback(result);
}
return(result);
}
/// <summary>
/// 开始发送
/// </summary>
/// <param name="data">发送的数据内容</param>
/// <param name="offset">数据偏移</param>
/// <param name="count">数据长度</param>
/// <param name="stream">Socket网络流</param>
/// <param name="callback">回调函数</param>
/// <param name="state">自定义状态</param>
/// <returns>异步结果</returns>
public IAsyncResult BeginSend(byte[] data, int offset, int count, Stream stream, AsyncCallback callback, object state)
{
if (data == null)
{
throw new ArgumentNullException("data");
}
if (offset < 0 || offset > data.Length)
{
throw new ArgumentOutOfRangeException("offset");
}
if (count <= 0 || count > data.Length - offset || count > ushort.MaxValue)
{
throw new ArgumentOutOfRangeException("count");
}
if (stream == null)
{
throw new ArgumentNullException("stream");
}
if (!stream.CanWrite)
{
throw new ArgumentException("stream can not write");
}
if (callback == null)
{
throw new ArgumentNullException("callback");
}
SocketAsyncResult result = new SocketAsyncResult(state);
SocketHandlerState shs = new SocketHandlerState(); //初始化SocketHandlerState
shs.Data = data;
shs.DataLength = 0;
shs.Stream = stream;
shs.Completed = true;
shs.AsyncResult = result;
shs.AsyncCallBack = callback;
lock (SendQueue) //锁定SendQueue,避免多线程同时发送数据
{
SendQueue.Add(shs); //添加状态
if (SendQueue.Count > 1) //表示尚有数据未发送完成
{
return(result);
}
}
try
{
stream.BeginWrite(shs.Data, 0, shs.Data.Length, EndWrite, shs); //开始异步发送数据
}
catch
{
result.CompletedSynchronously = true;
shs.Completed = false;
lock (StateSet)
StateSet.Add(result, shs);
((AutoResetEvent)result.AsyncWaitHandle).Set();
callback(result);
}
return(result);
}