/// <inheritdoc/>
public override async Task <DialogTurnResult> BeginDialogAsync(DialogContext dc, object options = null, CancellationToken cancellationToken = default(CancellationToken))
{
if (options is CancellationToken)
{
throw new ArgumentException($"{nameof(options)} cannot be a cancellation token");
}
if (Disabled != null && Disabled.GetValue(dc.State))
{
return(await dc.EndDialogAsync(cancellationToken : cancellationToken).ConfigureAwait(false));
}
Activity activity = null;
if (Attachments != null)
{
activity = await Attachments.BindAsync(dc, dc.State).ConfigureAwait(false);
}
if (activity?.Attachments?.Any() != true)
{
throw new InvalidOperationException($"Missing attachments in {Kind}.");
}
var layout = AttachmentLayout.GetValue(dc.State);
var attachments = activity.Attachments.Select(a => new MessagingExtensionAttachment(a.ContentType, null, a.Content));
var result = new MessagingExtensionResult
{
Type = MEResultResponseType.result.ToString(),
AttachmentLayout = layout.ToString(),
Attachments = attachments.ToList(),
};
var invokeResponse = CreateMessagingExtensionInvokeResponseActivity(dc, result);
ResourceResponse resourceResponse = await dc.Context.SendActivityAsync(invokeResponse, cancellationToken : cancellationToken).ConfigureAwait(false);
return(await dc.EndDialogAsync(resourceResponse, cancellationToken : cancellationToken).ConfigureAwait(false));
}