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C# DependencyObject.GetAncestors方法代碼示例

本文整理匯總了C#中Windows.UI.Xaml.DependencyObject.GetAncestors方法的典型用法代碼示例。如果您正苦於以下問題:C# DependencyObject.GetAncestors方法的具體用法?C# DependencyObject.GetAncestors怎麽用?C# DependencyObject.GetAncestors使用的例子?那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在Windows.UI.Xaml.DependencyObject的用法示例。


在下文中一共展示了DependencyObject.GetAncestors方法的1個代碼示例,這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚,您的評價將有助於係統推薦出更棒的C#代碼示例。

示例1: OnIsEnabledChanged

        /// <summary>
        /// Handles changes to the IsEnabled property.
        /// </summary>
        /// <param name="d">
        /// The <see cref="DependencyObject"/> on which
        /// the property has changed value.
        /// </param>
        /// <param name="e">
        /// Event data that is issued by any event that
        /// tracks changes to the effective value of this property.
        /// </param>
        private static async void OnIsEnabledChanged(
            DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            bool oldIsEnabled = (bool)e.OldValue;
            bool newIsEnabled = (bool)d.GetValue(IsEnabledProperty);

            if (!d.IsInVisualTree())
                await ((FrameworkElement)d).WaitForLoadedAsync();

            var listBoxItem =
                d as ListBoxItem ??
                d.GetAncestors().OfType<ListBoxItem>().FirstOrDefault();
            if (listBoxItem == null)
                return;
            //throw new InvalidOperationException("ListBoxItemExtensions.IsEnabled can only be set on a ListBoxItem or its descendant in the visual tree");

            listBoxItem.IsEnabled = newIsEnabled;
        }
開發者ID:siatwangmin,項目名稱:WinRTXamlToolkit,代碼行數:29,代碼來源:ListBoxItemExtensions.cs


注:本文中的Windows.UI.Xaml.DependencyObject.GetAncestors方法示例由純淨天空整理自Github/MSDocs等開源代碼及文檔管理平台,相關代碼片段篩選自各路編程大神貢獻的開源項目,源碼版權歸原作者所有,傳播和使用請參考對應項目的License;未經允許,請勿轉載。