同一应用程序页面上的多个应用程序栏无效

问题描述

我有一个页面，其中包含一个带复选框的List，并且每次我检查一个项目从一个AppBar切换到另一个有删除的项目时，它绑定到一个ObservableCollection

按钮，我正在使用collectionChanged事件来触发此切换，我的问题是当我删除一个项目并且缺陷属性现在为false时删除按钮仍然存在，它不会切换回默认的AppBar ..这是我的CollectionChanged事件：

I have a page that has a List with checkboxes and its bound to an ObservableCollection
everytime i check an item it switches from one AppBar to another that has a delete button, i am using a collectionChanged event to trigger this switching, my problem is when i delete an item and the ischecked property is now false the delete button still remains, it doesn't switch back to the default AppBar..here is my CollectionChanged event:

void MyItems_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
        {
            if (e.NewItems != null)
            {
                foreach (MyItems item in e.NewItems)
                {
                    item.PropertyChanged += item_PropertyChanged;
                }
            }
            if (e.OldItems != null)
            {
                foreach (MyItems item in e.OldItems)
                {
                    item.PropertyChanged -= item_PropertyChanged;
                }
            }
        }
        void item_PropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            if (e.PropertyName == "IsChecked")
            {
                if (MyItems.Any(i => i.IsChecked == true))
                {
                    ApplicationBar = (Microsoft.Phone.Shell.ApplicationBar)Resources["AppBarChecked"];
                }
                else
                {
                    ApplicationBar = (Microsoft.Phone.Shell.ApplicationBar)Resources["AppBarNotChecked"];
                }
            }
        }

所以任何可能导致问题的想法。

注意：我已经在PhoneApplicationPage Resources中声明了我的AppBars。

so any ideas of what could be causing the problem.
Note: I have declared my AppBars in the PhoneApplicationPage Resources.

推荐答案

CustomMessageBox

导致了错误。如果遇到这样的错误，请确保使用其他工具包，看看它是否解决了问题。

was causing the error. if you encounter such a bug make sure to use another toolkit and see if it solves the problem.

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