protected async override Task PostAsync(Activity item, string state, CancellationToken token)
{
var message = item as IMessageActivity;
if (message != null)
{
stack.Reset();
var root = new RootDialog();
await stack.Forward(root, null, message, CancellationToken.None);
await task.PollAsync(CancellationToken.None);
}
}
/// <summary>
/// Interrupt the waiting dialog with a new dialog
/// </summary>
/// <typeparam name="T">The type of result expected from the dialog.</typeparam>
/// <typeparam name="R">The type of the item posted to dialog.</typeparam>
/// <param name="stack">The dialog stack.</param>
/// <param name="dialog">The new interrupting dialog.</param>
/// <param name="item">The item to foward to the new interrupting dialog.</param>
/// <param name="token">The cancellation token.</param>
/// <returns>A task that represents the interruption operation.</returns>
public static async Task InterruptAsync <T, R>(this IDialogStack stack, IDialog <T> dialog, R item, CancellationToken token)
{
await stack.Forward(dialog.Void <T, R>(), null, item, token);
await stack.PollAsync(token);
}
/// <summary>
/// Call a child dialog, add it to the top of the stack and post the message to the child dialog.
/// </summary>
/// <typeparam name="R">The type of result expected from the child dialog.</typeparam>
/// <param name="stack">The dialog stack.</param>
/// <param name="child">The child dialog.</param>
/// <param name="resume">The method to resume when the child dialog has completed.</param>
/// <param name="message">The message that will be posted to child dialog.</param>
/// <param name="token">A cancellation token.</param>
/// <returns>A task representing the Forward operation.</returns>
public static async Task Forward <R>(this IDialogStack stack, IDialog <R> child, ResumeAfter <R> resume, IMessageActivity message, CancellationToken token)
{
await stack.Forward <R, IMessageActivity>(child, resume, message, token);
}