Event argument used by the RoutedDataTemplateSelector's TemplateRequested event.
Inheritance: System.Windows.RoutedEventArgs
コード例 #1
0
        /// <summary>
        /// Raises the TemplateRequested event up the 'container' element's logical tree
        /// so that the DataTemplate to return can be determined.
        /// </summary>
        /// <param name="item">The data object being templated.</param>
        /// <param name="container">The element which contains the data object.</param>
        /// <returns>The DataTemplate to apply.</returns>
        public override DataTemplate SelectTemplate(object item, DependencyObject container)
        {
            // We need 'container' to be a UIElement because that class
            // exposes the RaiseEvent method.
            UIElement templatedElement = container as UIElement;
            if (templatedElement == null)
                throw new ArgumentException("RoutedDataTemplateSelector only works with UIElements.");

            // Bubble the TemplateRequested event up the logical tree, starting at the templated element.
            // This allows the outside world to determine what template to use.
            TemplateRequestedEventArgs args = new TemplateRequestedEventArgs(TemplateRequestedEvent, templatedElement, item);
            templatedElement.RaiseEvent(args);

            // Return the DataTemplate selected by the outside world.
            return args.TemplateToUse;
        }
コード例 #2
0
        /// <summary>
        /// Raises the TemplateRequested event up the 'container' element's logical tree
        /// so that the DataTemplate to return can be determined.
        /// </summary>
        /// <param name="item">The data object being templated.</param>
        /// <param name="container">The element which contains the data object.</param>
        /// <returns>The DataTemplate to apply.</returns>
        public override DataTemplate SelectTemplate(object item, DependencyObject container)
        {
            // We need 'container' to be a UIElement because that class
            // exposes the RaiseEvent method.
            UIElement templatedElement = container as UIElement;

            if (templatedElement == null)
            {
                throw new ArgumentException("RoutedDataTemplateSelector only works with UIElements.");
            }

            // Bubble the TemplateRequested event up the logical tree, starting at the templated element.
            // This allows the outside world to determine what template to use.
            TemplateRequestedEventArgs args = new TemplateRequestedEventArgs(TemplateRequestedEvent, templatedElement, item);

            templatedElement.RaiseEvent(args);

            // Return the DataTemplate selected by the outside world.
            return(args.TemplateToUse);
        }