/// <summary>
/// Starts sending TOP command to POP3 server.
/// </summary>
/// <param name="op">Asynchronous operation.</param>
/// <returns>Returns true if aynchronous operation is pending (The <see cref="MessageTopLinesToStreamAsyncOP.CompletedAsync"/> event is raised upon completion of the operation).
/// Returns false if operation completed synchronously.</returns>
/// <exception cref="ObjectDisposedException">Is raised when this object is disposed and and this method is accessed.</exception>
/// <exception cref="InvalidOperationException">Is raised when POP3 client is not in valid state. For example 'not connected'.</exception>
/// <exception cref="ArgumentNullException">Is raised when <b>op</b> is null reference.</exception>
public bool MessageTopLinesToStreamAsync(MessageTopLinesToStreamAsyncOP op)
{
if(this.IsDisposed){
throw new ObjectDisposedException(this.GetType().Name);
}
if(this.IsMarkedForDeletion){
throw new InvalidOperationException("Message is already marked for deletion.");
}
if(op == null){
throw new ArgumentNullException("op");
}
if(op.State != AsyncOP_State.WaitingForStart){
throw new ArgumentException("Invalid argument 'op' state, 'op' must be in 'AsyncOP_State.WaitingForStart' state.","op");
}
return op.Start(this);
}
/// <summary>
/// Stores message header + specified number lines of message body to the specified stream.
/// </summary>
/// <param name="stream">Stream where to store data.</param>
/// <param name="lineCount">Number of lines to get from message body.</param>
/// <exception cref="ObjectDisposedException">Is raised when this object is disposed and this method is accessed.</exception>
/// <exception cref="ArgumentNullException">Is raised when argument <b>stream</b> value is null.</exception>
/// <exception cref="InvalidOperationException">Is raised when message is marked for deletion and this method is accessed.</exception>
/// <exception cref="POP3_ClientException">Is raised when POP3 serveer returns error.</exception>
public void MessageTopLinesToStream(Stream stream,int lineCount)
{
if(this.IsDisposed){
throw new ObjectDisposedException(this.GetType().Name);
}
if(stream == null){
throw new ArgumentNullException("Argument 'stream' value can't be null.");
}
if(this.IsMarkedForDeletion){
throw new InvalidOperationException("Can't access message, it's marked for deletion.");
}
using(MessageTopLinesToStreamAsyncOP op = new MessageTopLinesToStreamAsyncOP(stream,lineCount)){
using(ManualResetEvent wait = new ManualResetEvent(false)){
op.CompletedAsync += delegate(object s1,EventArgs<MessageTopLinesToStreamAsyncOP> e1){
wait.Set();
};
if(!this.MessageTopLinesToStreamAsync(op)){
wait.Set();
}
wait.WaitOne();
wait.Close();
if(op.Error != null){
throw op.Error;
}
}
}
}