/// <summary>
/// Starts operation processing.
/// </summary>
/// <param name="owner">Owner POP3 client.</param>
/// <returns>Returns true if asynchronous operation in progress or false if operation completed synchronously.</returns>
/// <exception cref="ArgumentNullException">Is raised when <b>owner</b> is null reference.</exception>
internal bool Start(POP3_Client owner)
{
if(owner == null){
throw new ArgumentNullException("owner");
}
m_pPop3Client = owner;
SetState(AsyncOP_State.Active);
try{
// Start executing LIST command.
POP3_Client.ListAsyncOP listOP = new ListAsyncOP();
listOP.CompletedAsync += delegate(object sender,EventArgs<ListAsyncOP> e){
ListCompleted(listOP);
};
if(!m_pPop3Client.ListAsync(listOP)){
ListCompleted(listOP);
}
}
catch(Exception x){
m_pException = x;
m_pPop3Client.LogAddException("Exception: " + x.Message,x);
SetState(AsyncOP_State.Completed);
}
// Set flag rise CompletedAsync event flag. The event is raised when async op completes.
// If already completed sync, that flag has no effect.
lock(m_pLock){
m_RiseCompleted = true;
return m_State == AsyncOP_State.Active;
}
}