| private DoOperationReceiveFrom ( SafeCloseSocket handle, SocketFlags &flags, int &bytesTransferred ) : SocketError | ||
| handle | SafeCloseSocket | |
| flags | SocketFlags | |
| bytesTransferred | int | |
| return | SocketError | |
public bool ReceiveFromAsync(SocketAsyncEventArgs e)
{
bool retval;
if (s_loggingEnabled)
{
Logging.Enter(Logging.Sockets, this, "ReceiveFromAsync", "");
}
if (CleanedUp)
{
throw new ObjectDisposedException(GetType().FullName);
}
if (e == null)
{
throw new ArgumentNullException("e");
}
if (e.RemoteEndPoint == null)
{
throw new ArgumentNullException("RemoteEndPoint");
}
if (!CanTryAddressFamily(e.RemoteEndPoint.AddressFamily))
{
throw new ArgumentException(SR.Format(SR.net_InvalidEndPointAddressFamily, e.RemoteEndPoint.AddressFamily, _addressFamily), "RemoteEndPoint");
}
// We don't do a CAS demand here because the contents of remoteEP aren't used by
// WSARecvFrom; all that matters is that we generate a unique-to-this-call SocketAddress
// with the right address family.
EndPoint endPointSnapshot = e.RemoteEndPoint;
e._socketAddress = SnapshotAndSerialize(ref endPointSnapshot);
// DualMode sockets may have updated the endPointSnapshot, and it has to have the same AddressFamily as
// e.m_SocketAddres for Create to work later.
e.RemoteEndPoint = endPointSnapshot;
// Prepare for the native call.
e.StartOperationCommon(this);
e.StartOperationReceiveFrom();
// Make the native call.
SocketFlags flags;
int bytesTransferred;
SocketError socketError;
try
{
socketError = e.DoOperationReceiveFrom(_handle, out flags, out bytesTransferred);
}
catch (Exception ex)
{
// Clear in-use flag on event args object.
e.Complete();
throw ex;
}
// Handle completion when completion port is not posted.
if (socketError != SocketError.Success && socketError != SocketError.IOPending)
{
e.FinishOperationSyncFailure(socketError, bytesTransferred, flags);
retval = false;
}
else
{
retval = true;
}
if (s_loggingEnabled)
{
Logging.Exit(Logging.Sockets, this, "ReceiveFromAsync", retval);
}
return retval;
}