Windows phone 8.1 中如何取消页面后退？

Question

Windows phone 8.1 中如何取消页面后退？

下面的代码似乎不起作用：

private void OnBackPressed(object sender, BackPressedEventArgs e)
        {
            if (this.ItemsListView.SelectionMode == ListViewSelectionMode.Multiple)
            {
                this.ItemsListView.SelectionMode = ListViewSelectionMode.None;
                e.Handled = true;
            }
        }

Answer 1

楼主 你好，

请参考：

while(NavigationService.CanGoBack)
{
    NavigationService.RemoveBackEntry();
}

谢谢！

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Answer 2

感谢 @Jimmy Yang' 的回复。

我创建的是 Windows phone 8.1 应用程序，因此在上下文中没有 NavigationService。另外，您给的参考是将后退堆栈中的条目删除，而在本例中要实现的是：如果 ListView 在多选模式下时退出多选模式，否则退回到上个页面。是否还有其他解决方案？

谢谢。

Answer 3

请问你上面这段函数式写在哪里的？

Answer 4

解决了。WP8.1 的项目模版里面加入了 NavigationHelper，并且在里面为 HardwareButtons 注册了 BackPressed 事件，因此设置 NavigationHelper 的 GoBackCommand 就可以了。例如。

this.navigationHelper.GoBackCommand = new RelayCommand(() =>
            {
                if (this.ItemsListView.SelectionMode == ListViewSelectionMode.Multiple)
                {
                    this.ItemsListView.SelectionMode = ListViewSelectionMode.None;
                }
                else
                {
                    this.navigationHelper.GoBack();
                }

            }, this.navigationHelper.CanGoBack);