/// <summary>
/// Makes an asynchronous DELETE request to the Facebook server.
/// </summary>
/// <param name="facebookClient">The facebook client.</param>
/// <param name="path">The resource path.</param>
/// <param name="parameters">The parameters.</param>
/// <returns>The task of the result.</returns>
public static Task <object> DeleteTaskAsync(this FacebookClient facebookClient, string path, IDictionary <string, object> parameters)
{
Contract.Requires(!(string.IsNullOrEmpty(path) && parameters == null));
var tcs = CreateSource <object>(null);
EventHandler <FacebookApiEventArgs> handler = null;
handler = (sender, e) => TransferCompletionToTask <object>(tcs, e, () => e.GetResultData(), () => facebookClient.DeleteCompleted -= handler);
facebookClient.DeleteCompleted += handler;
try
{
facebookClient.DeleteAsync(path, parameters, tcs);
}
catch
{
facebookClient.DeleteCompleted -= handler;
tcs.TrySetCanceled();
throw;
}
return(tcs.Task);
}
private void DeleteLastMessage_Click(object sender, RoutedEventArgs e)
{
btnDeleteLastMessage.IsEnabled = false;
var fb = new FacebookClient(_accessToken);
// make sure to add event handler for DeleteCompleted.
fb.DeleteCompleted += (o, args) =>
{
// incase you support cancellation, make sure to check
// e.Cancelled property first even before checking (e.Error!=null).
if (args.Cancelled)
{
// for this example, we can ignore as we don't allow this
// example to be cancelled.
// you can check e.Error for reasons behind the cancellation.
var cancellationError = args.Error;
}
else if (args.Error != null)
{
// error occurred
Dispatcher.BeginInvoke(
() =>
{
MessageBox.Show(args.Error.Message);
});
}
else
{
// the request was completed successfully
// make sure to be on the right thread when working with ui.
Dispatcher.BeginInvoke(() =>
{
MessageBox.Show("Message deleted successfully");
btnDeleteLastMessage.IsEnabled = false;
});
}
};
fb.DeleteAsync(_lastMessageId);
}
private void DeleteLastMessage_Click(object sender, RoutedEventArgs e)
{
btnDeleteLastMessage.IsEnabled = false;
var fb = new FacebookClient(_accessToken);
fb.DeleteCompleted += (o, args) =>
{
if (args.Error != null)
{
Dispatcher.BeginInvoke(() => MessageBox.Show(args.Error.Message));
return;
}
Dispatcher.BeginInvoke(() =>
{
MessageBox.Show("Message deleted successfully");
btnDeleteLastMessage.IsEnabled = false;
});
};
fb.DeleteAsync(_lastMessageId);
}
/// <summary>
/// Delete post from wall of facebook user
/// </summary>
public void DeletePost()
{
var fb = new FacebookClient(_accessToken);
fb.DeleteCompleted += (o, args) =>
{
if (args.Error != null)
{
Dispatcher.BeginInvoke(() => MessageBox.Show(args.Error.Message));
return;
}
Dispatcher.BeginInvoke(() =>
{
MessageBox.Show("Message deleted successfully");
btnDeletePost.IsEnabled = false;
});
};
fb.DeleteAsync(_lastMessageId); // delete message from wall
}
