/// <summary>
/// 异步发送
/// </summary>
/// <param name="buffer">字节数组</param>
/// <param name="offset">起始偏移量</param>
/// <param name="size">字节数</param>
public void Write(Byte[] buffer, Int32 offset, Int32 size)
{
// 用户定义对象
AsyncWriteStateObject State = new AsyncWriteStateObject
{ // 将事件状态设置为非终止状态，导致线程阻止
eventDone = new ManualResetEvent(false),
stream = Stream,
exception = null,
};
// 写入加长度信息头的数据
Stream.BeginWrite(buffer, 0, buffer.Length, new AsyncCallback(AsyncWriteCallback), State);
// 等待操作完成信号
if (State.eventDone.WaitOne(Stream.WriteTimeout, false))
{ // 接收到信号
if (State.exception != null)
{
throw State.exception;
}
}
else
{ // 超时异常
throw new TimeoutException();
}
}
/// <summary>
/// 异步写入回调函数
/// </summary>
/// <param name="ar">异步操作结果</param>
private static void AsyncWriteCallback(IAsyncResult ar)
{
AsyncWriteStateObject State = ar.AsyncState as AsyncWriteStateObject;
try
{ // 异步写入结束
State.stream.EndWrite(ar);
}
catch (Exception e)
{ // 异步连接异常
State.exception = e;
}
finally
{ // 将事件状态设置为终止状态，线程继续
State.eventDone.Set();
}
}