private void EndReceive(IAsyncResult result)
{
UDPServiceAsyncState state = (UDPServiceAsyncState)result.AsyncState;
int dataLength;
EndPoint clientip = new IPEndPoint(IPAddress.Any, 0);
try
{
dataLength = Socket.EndReceiveFrom(result, ref clientip);
}
catch
{
dataLength = 0;
}
byte[] data = state.Data;
if (dataLength == 0)
{
return;
}
EndPoint ip = new IPEndPoint(IPAddress.Any, 0);
state.Data = new byte[ReceiveBufferSize];
Socket.BeginReceiveFrom(state.Data, 0, ReceiveBufferSize, SocketFlags.None, ref ip, EndReceive, state);
if (ReceiveCompleted != null)
{
ReceiveCompleted(this, new UDPServiceEventArgs {
EndPoint = (IPEndPoint)clientip, Data = data, DataLength = dataLength, Operation = SocketAsyncOperation.ReceiveFrom
});
}
}
private void CreateReceive()
{
UDPServiceAsyncState state = new UDPServiceAsyncState();
state.Data = new byte[ReceiveBufferSize];
EndPoint ip = new IPEndPoint(IPAddress.Any, 0);
Socket.BeginReceiveFrom(state.Data, 0, ReceiveBufferSize, SocketFlags.None, ref ip, EndReceive, state);
}
private void EndSend(IAsyncResult result)
{
UDPServiceAsyncState state = (UDPServiceAsyncState)result.AsyncState;
Socket.EndSendTo(result);
if (state.IsAsync && SendCompleted != null)
{
SendCompleted(this, new UDPServiceEventArgs {
EndPoint = state.EndPoint, Data = state.Data, DataLength = state.Data.Length, Operation = SocketAsyncOperation.SendTo
});
}
}
/// <summary>
/// 发送数据
/// </summary>
/// <param name="remote">远程终结点。</param>
/// <param name="data">要发送的数据。</param>
public void SendAsync(IPEndPoint remote, byte[] data)
{
if (!IsStarted)
{
throw new InvalidOperationException("没有开始服务。");
}
UDPServiceAsyncState state = new UDPServiceAsyncState();
state.Data = data;
state.IsAsync = true;
state.EndPoint = remote;
Socket.BeginSendTo(data, 0, data.Length, SocketFlags.None, remote, EndSend, state);
}