private static Task<bool> SendTaskInternal(SmtpClient client, CancellationToken token, object userToken,
Action<TaskCompletionSource<bool>> sendAsyncAction) {
client.ShouldNotBeNull("client");
sendAsyncAction.ShouldNotBeNull("sendAsyncAction");
if(IsDebugEnabled)
log.Debug("SmtpClient를 이용하여 비동기방식으로 메일을 발송합니다... SmtpHost=[{0}]", client.Host);
var tcs = new TaskCompletionSource<bool>(userToken);
token.Register(client.SendAsyncCancel);
SendCompletedEventHandler handler = null;
handler = (s, e) => EventAsyncPattern.HandleCompletion(tcs,
e,
() => (e.Cancelled == false && e.Error != null),
() => client.SendCompleted -= handler);
client.SendCompleted += handler;
try {
sendAsyncAction(tcs);
}
catch(Exception ex) {
client.SendCompleted -= handler;
tcs.TrySetException(ex);
}
return tcs.Task;
}
