private void AsyncCallback(IAsyncResult ar)
{
if (ar.AsyncState is AsyncStateOne state)
{
try
{
int received = state.WorkSocket.EndReceiveFrom(ar, ref state.UdpEndPoint);
//释放连接关联
state.WorkSocket = null;
//马上开始重新接收，提供性能保障
RefreshReceive();
//处理数据
if (received >= HslCommunicationCode.HeadByteLength)
{
//检测令牌
if (NetSupport.IsTwoBytesEquel(state.BytesContent, 12, KeyToken.ToByteArray(), 0, 16))
{
state.IpEndPoint = (IPEndPoint)state.UdpEndPoint;
int contentLength = BitConverter.ToInt32(state.BytesContent, HslCommunicationCode.HeadByteLength - 4);
if (contentLength == received - HslCommunicationCode.HeadByteLength)
{
byte[] head = new byte[HslCommunicationCode.HeadByteLength];
byte[] content = new byte[contentLength];
Array.Copy(state.BytesContent, 0, head, 0, HslCommunicationCode.HeadByteLength);
if (contentLength > 0)
{
Array.Copy(state.BytesContent, 32, content, 0, contentLength);
}
//解析内容
content = NetSupport.CommandAnalysis(head, content);
int protocol = BitConverter.ToInt32(head, 0);
int customer = BitConverter.ToInt32(head, 4);
//丢给数据中心处理
DataProcessingCenter(state, protocol, customer, content);
}
else
{
//否则记录到日志
LogNet?.WriteWarn(LogHeaderText, $"接收到异常数据，应接收长度：{(BitConverter.ToInt32(state.BytesContent, 4) + 8)} 实际接收：{received}");
}
}
else
{
LogNet?.WriteWarn(LogHeaderText, StringResources.TokenCheckFailed);
}
}
else
{
LogNet?.WriteWarn(LogHeaderText, $"接收到异常数据，长度不符合要求，实际接收：{received}");
}
}
catch (ObjectDisposedException ex)
{
//主程序退出的时候触发
}
catch (Exception ex)
{
LogNet?.WriteException(LogHeaderText, StringResources.SocketEndReceiveException, ex);
//重新接收，此处已经排除掉了对象释放的异常
RefreshReceive();
}
finally
{
//state = null;
}
}
}