/// <summary>
/// Is called before the view model is navigated away from. Other than OnDeactivate, OnNavigateFrom is called everytime the user navigates away from this view model.
/// </summary>
/// <param name="e">The event arguments, that allows the navigation to be cancelled.</param>
public virtual Task OnNavigateFromAsync(NavigationEventArgs e)
{
return Task.FromResult(0);
}
/// <summary> /// Is called when the user is navigated to the view corresponding to this view model. Renders the report for display. /// </summary> /// <param name="e">The event arguments, that contain more information about the navigation.</param> public override async Task OnNavigateToAsync(NavigationEventArgs e) => this.FixedDocument.Value = await this.reportingService.RenderAsync<Document>();
/// <summary>
/// Is called when the user is navigated to the view of this view model. Loads the todo list items from storage.
/// </summary>
/// <param name="e">The navigation arguments, that contain more information about the navigation.</param>
public override Task OnNavigateToAsync(NavigationEventArgs e)
{
// Clears the current list of todo list items first
this.todoListItems.Clear();
// Loads all the todo list items from the repository and stores them in a list, so that the view has access to them
this.todoListItems.AddRange(this.todoListItemsRepository.GetTodoListItems().ToList());
// Since no asynchronous operation was performed, an empty task is returned
return Task.FromResult(0);
}
