如何删除表单的NavigationService？

Question

我已经创建了一个只有几页的框架。框架有自己的日志：

JournalOwnership="OwnsJournal"

当我传递2个页面时，我想清除frame NavigationService

Frame parent_frame = (Frame)Application.Current.MainWindow.FindName("content_frame");

JournalEntry remove = parent_frame.RemoveBackEntry();

while (parent_frame.NavigationService.CanGoBack) {
    parent_frame.NavigationService.RemoveBackEntry();
    MessageBox.Show("Remove");
}

但在清理完NavigationService之后，我可以返回。

Answer 1

要做到这一点，最简单的方法是处理框架导航事件：

frame.Navigated += frame_Navigated;

void frame_Navigated(object sender, NavigationEventArgs e)
{
    frame.NavigationService.RemoveBackEntry();
}

Answer 2

我已经删除了NavigationService.BackStack中所有可能的页面，并在删除最后一页时添加了事件。

Frame root = (Frame)Application.Current.MainWindow.FindName("content_frame");
int i = 0;

while (root.NavigationService.CanGoBack) {
    i++;
    root.NavigationService.RemoveBackEntry();
}
root.NavigationService.RemoveBackEntry();
MessageBox.Show("Deleted - " + i);


NavigatedEventHandler navigated_handle = null;
navigated_handle = (o, e) => {
    ((Frame)o).RemoveBackEntry();
    MessageBox.Show("Do and remove itself!");
    root.Navigated -= navigated_handle;
};
root.Navigated += navigated_handle;