public TivoContainer EndExecute(IAsyncResult asyncResult)
{
WebClientAsyncResult webClientAsyncResult = asyncResult as WebClientAsyncResult;
if (webClientAsyncResult == null)
{
throw new ArgumentException("IAsyncResult did not come from BeginQueryContainer", "asyncResult");
}
if (webClientAsyncResult.Error != null)
{
throw webClientAsyncResult.Error;
}
return((TivoContainer)webClientAsyncResult.Result);
}
public IAsyncResult BeginExecute(AsyncCallback asyncCallback, object asyncState)
{
if (_connection.State != TivoConnectionState.Open)
{
throw new InvalidOperationException();
}
Uri uri;
PrepareQueryContainer(_connection.WebClient, out uri);
_connection.WebClient.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);
WebClientAsyncResult asyncResult = new WebClientAsyncResult(asyncCallback, asyncState);
_connection.WebClient.OpenReadAsync(uri, asyncResult);
return(asyncResult);
}
void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
// unregister so query and connection can be reused.
_connection.WebClient.OpenReadCompleted -= new OpenReadCompletedEventHandler(client_OpenReadCompleted);
// return object
WebClientAsyncResult asyncResult = (WebClientAsyncResult)e.UserState;
try
{
using (var stream = e.Result)
using (var reader = new System.IO.StreamReader(stream))
{
var doc = System.Xml.Linq.XDocument.Load(reader);
asyncResult.Result = (TivoContainer)doc;
}
}
catch (Exception ex)
{
asyncResult.Error = ex;
}
asyncResult.AsyncCallback(asyncResult);
// TODO: what to do with errors and cancelled?
}
