/// <summary>
/// UDP默认使用任何可用端口
/// </summary>
/// <param name="networkInterfacesIp"></param>
/// <param name="error"></param>
/// <param name="localPort"></param>
/// <returns></returns>
public bool Bind(string networkInterfacesIp, out string error, Int32 localPort = 0)
{
Boolean result = false;
try
{
error = null;
NCIp = networkInterfacesIp;
var ip = IPAddress.Any;
if (!string.IsNullOrEmpty(networkInterfacesIp))
{
ip = IPAddress.Parse(networkInterfacesIp);
}
client = new UdpClient(new IPEndPoint(ip, localPort));
UdpState state = new UdpState(client, RemoteEP);
client.BeginReceive(EndReceive, state);
result = true;
IsConnected = true;
}
catch (SocketException ex)
{
error = string.Format("初始化网络时发生了如下错误：\r\n\r\n\t{0}", ex.Message);
}
return(result);
}
/// <summary>
/// 接收数据回调处理程序
/// </summary>
/// <param name="ar"></param>
void EndReceive(IAsyncResult ar)
{
UdpState s = ar.AsyncState as UdpState;
if (s != null)
{
UdpClient udpClient = s.UdpClient;
IPEndPoint ip = s.IP;
Byte[] receiveBytes;
string error;
try
{
receiveBytes = udpClient.EndReceive(ar, ref ip);
}
catch (ObjectDisposedException)
{
//如果是手动Close就直接返回
return;
}
catch (System.Exception ex)
{
//如果是网络环境异常，就释放掉当前连接
System.Diagnostics.Trace.WriteLine(ex.Message);
//Logger.Error(String.Format("UDP EndReceive报错：{0}", ex.Message));
//CloseInternal(udpClient);
Close(out error);
return;
}
PrintDataSourceEndPoint(ip);
OnDataReceived(receiveBytes);
try
{
udpClient.BeginReceive(EndReceive, s); //在这里重新开始一个异步接收，用于处理下一个网络请求
}
catch (ObjectDisposedException)
{
Close(out error);
}
}
}
