NavigationService

代码：NavigationService类型的基本成员

sealed class NavigationService : IContentContainer
{
　// 导航
　public bool Navigate(Uri source); // 导航到URI
　public void Refresh(); // 重新导航到当前内容
　public void StopLoading(); // 停止当前的导航 // 导航历史
　public bool CanGoBack { get; } // Content in back nav. history?
　public bool CanGoForward { get; } // Content in forward nav. history?
　public void GoBack(); // Go to previous content in nav. history
　public void GoForward(); // Go to next content in nav. history

　// 导航的生命周期
　// 导航请求
　public event NavigatingCancelEventHandler Navigating;
　// 导航到内容
　public event NavigatedEventHandler Navigated;
　// 内容载入了
　public event LoadCompletedEventHandler LoadCompleted;
　// 导航错误
　public event NavigationFailedEventHandler NavigationFailed;
　// 下载的字节数
　public event NavigationProgressEventHandler NavigationProgress;
　// 导航停止了
　public event NavigationStoppedEventHandler NavigationStopped;

　// 内容
　public object Content { get; set; } // 当前载入的内容
　public Uri CurrentSource { get; } // 当前内容的URI
　public Uri Source { get; set; } // 当前内容的URI，或者将导航到的内容的URI

　// 查找导航服务
　public static NavigationService GetNavigationService(DependencyObject dependencyObject);
}